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Relevant bibliographies by topics / Seismic forces

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Academic literature on the topic 'Seismic forces'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Seismic forces"

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Olmos, Bertha A., and Jose Manuel Roesset. "Seismic forces on piles." Structure and Infrastructure Engineering 9, no. 12 (December 2013): 1283–98. http://dx.doi.org/10.1080/15732479.2012.688976.

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McRae, Hamish. "Seismic forces of global change." Strategy & Leadership 24, no. 6 (March 1996): 6–11. http://dx.doi.org/10.1108/eb054569.

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Bolotbek, T., K. M. Mirlanov, A. Y. Telin, E. S. Chukanov, and A. T. Talgatov. "SPECTRAL METHODS FOR DETERMINING THE SEISMIC FORCES OF BUILDINGS." Herald of KSUCTA, №2, Part 1, 2022, no. 2-1-2022 (April 30, 2022): 426–34. http://dx.doi.org/10.35803/1694-5298.2022.2.426-434.

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The article discusses methods for calculating seismic effects on buildings and structures along the spectral curve, creating a dynamic calculation scheme for load-bearing structural elements, inertial reactions and displacements of building structures, natural and forced vibrations of buildings under the effect of seismic forces.

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Cheng, Yuan Bing, Hong Wei Du, Shi Yun Zhang, and Liu Zhong Xu. "Seismic Design of R.C. Stairs in Masonry Structure." Advanced Materials Research 163-167 (December 2010): 4133–37. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.4133.

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In view of masonry structures with rigid floor slab, seismic behavior of R. C. stairs and influence of stairs on the stiffness of lateral walls of stair well was analyzed, calculation formulae of the seismic internal forces of stairs were deduced, calculation method of the seismic shear forces considering the seismic effect of stairs on main structure were given out. Analysis and comparison on engineering ensamples were carried out. The results show K-type bracing function of step slabs to main structure is evident. Considering the bracing function, shear deformation of the floor layer and shear forces in the seismic walls are decreased, internal forces in R. C. stairs are increased. Seismic design recommendation of step slab to decrease the seismic forces was presented.

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Jaiswal, O. R., Durgesh C. Rai, and Sudhir K. Jain. "Review of Seismic Codes on Liquid-Containing Tanks." Earthquake Spectra 23, no. 1 (February 2007): 239–60. http://dx.doi.org/10.1193/1.2428341.

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Liquid storage tanks generally possess lower energy-dissipating capacity than conventional buildings. During lateral seismic excitation, tanks are subjected to hydrodynamic forces. These two aspects are recognized by most seismic codes on liquid storage tanks and, accordingly, provisions specify higher seismic forces than buildings and require modeling of hydrodynamic forces in analysis. In this paper, provisions of ten seismic codes on tanks are reviewed and compared. This review has revealed that there are significant differences among these codes on design seismic forces for various types of tanks. Reasons for these differences are critically examined and the need for a unified approach for seismic design of tanks is highlighted.

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Akhtar, Mohsin Aakib Shamim. "Dynamic Seismic Analysis of Multi Storey Buildings in Seismic Zone V." International Journal for Research in Applied Science and Engineering Technology 10, no. 2 (February 28, 2022): 108–15. http://dx.doi.org/10.22214/ijraset.2022.40154.

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Abstract: In India, multi-storied buildings area unit sometimes created because of high value and deficiency of land. Earthquake could be a phenomenon which might generate the foremost harmful forces on structures. Buildings ought to be created safe for lives by correct style and particularisation of structural members so as to possess a ductile sort of failure. To protect such civil structures from significant structural damage, the seismic response of these structures is analyzed along with wind force calculation and forces such as support reactions and joint displacement are calculated and included in the structural design for a vibration resistant structure. The primary objective is to make associate earthquake resistant structure by enterprise seismal study of the structure by static equivalent methodology of study and do the analysis and design of the building by using STAAD PRO software in both static and dynamic analysis Keywords: Dynamic Seismic Analysis, Staad.Pro.

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Chin, C. Y., Claudia Kayser, and Michael Pender. "Seismic earth forces against embedded retaining walls." Bulletin of the New Zealand Society for Earthquake Engineering 49, no. 2 (June 30, 2016): 200–210. http://dx.doi.org/10.5459/bnzsee.49.2.200-210.

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This paper provides results from carrying out two-dimensional dynamic finite element analyses to determine the applicability of simple pseudo-static analyses for assessing seismic earth forces acting on embedded cantilever and propped retaining walls appropriate for New Zealand. In particular, this study seeks to determine if the free-field Peak Ground Acceleration (PGAff) commonly used in these pseudo-static analyses can be optimized. The dynamic finite element analyses considered embedded cantilever and propped walls in shallow (Class C) and deep (Class D) soils (NZS 1170.5:2004). Three geographical zones in New Zealand were considered. A total of 946 finite element runs confirmed that optimized seismic coefficients based on fractions of PGAff can be used in pseudo-static analyses to provide moderately conservative estimates of seismic earth forces acting on retaining walls. Seismic earth forces were found to be sensitive to and dependent on wall displacements, geographical zones and soil classes. A reclassification of wall displacement ranges associated with different geographical zones, soil classes and each of the three pseudo-static methods of calculations (Rigid, Stiff and Flexible wall pseudo-static solutions) is presented. The use of different ensembles of acceleration-time histories appropriate for the different geographic zones resulted in significantly different calculated seismic earth forces, confirming the importance of using geographic-specific motions. The recommended location of the total dynamic active force (comprising both static and dynamic forces) for all cases is 0.7H from the top of the wall (where H is the retained soil height).

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Bai, Bing, Ze Yu Wu, and Xiao Shan Deng. "Longitudinal Seismic Forces of Long-Span Bridge." Advanced Materials Research 255-260 (May 2011): 1134–37. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1134.

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Based on the numerical simulation and finite element method, the longitudinal seismic action of a long-span continuous bridge is systematically analyzed. Four load cases are considered, i.e. bridge without piers, bridge with piers, neglecting friction force and combining friction force and pier scouring respectively. Calculation results show that: when considering the piers, the contribution of piers to bridge longitudinal seismic forces is depending on the concrete problems; when the friction force of rubber supports is regarded, sliding support greatly enhances the longitudinal overall rigidity of the bridge, but the force is resolved to each rubber support and can improve the stress state of the fixed support; considering effect of scouring, the elongation of piers will lead to the decrease of longitudinal overall rigidity, thereby lowering the longitudinal seismic forces. From comparison of the two piers that, the relatively flexible structure has shock absorption to a certain extent, so it is more suitable for the bridge.

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Chernov, Yury T., and Jaafar Qbaily. "Evaluation of seismic forces under modified structural schemes in the process of vibrations." Structural Mechanics of Engineering Constructions and Buildings 17, no. 4 (December 15, 2021): 391–403. http://dx.doi.org/10.22363/1815-5235-2021-17-4-391-403.

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The aim of the work - development of one of the possible methods for seismic analysis that considers the inelastic behavior of structures under seismic loads. This requires the development of seismic analysis methods that take into account the change (decrease) in the bearing capacity or the destruction of individual elements until the final loss of the bearing capacity of the structure. Methods. The dependences and algorithms include determining seismic forces using the method of normal forms, which until now is the main one in solving problems of the seismic resistance theory in seismic regions, calculation formulas to calculate seismic forces at each time step are presented in the form of expansions into natural vibration modes, which regard the changes in the design scheme. The calculation is repeated at each time step as a static calculation for the action of seismic forces determined at the previous stage, before the building collapses. Results. The developed dependencies and algorithms allow to consider changes in the design scheme during vibrations at each time step, changes in the dynamic properties of the building and, as a result, the values of seismic forces. The value of the coefficient of inelastic work of structures K 1, which are given in regulatory documents, do not give fully correspond to the actual behavior of the structure under seismic influences. The proposed calculation method allows to determine the estimated values of seismic forces and their distribution taking into account the influence of damage of elements and the appearance of inelastic zones in the design process of fluctuations at each time step and to assess the dynamic behavior of the building.

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Rezaeian, Hooman, George Charles Clifton, and James B. P. Lim. "Compatibility Forces in Floor Diaphragms of Steel Braced Multi-Story Buildings." Key Engineering Materials 763 (February 2018): 310–19. http://dx.doi.org/10.4028/www.scientific.net/kem.763.310.

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Floors have a key role in the seismic behaviour of structures, especially in multi-story buildings. The in-plane behaviour of a floor system influences the seismic response of the structure significantly and affects the distribution of lateral forces between seismic resisting systems and over the height of the structure. In buildings where the seismic resisting systems are in the same location in plan on each floor over the height of the building, inertial and displacement compatibility shear forces are the principal shear forces generated at the interface between the floor system and the seismic-resisting system. These two are called interface diaphragm forces. These interface forces must be transferred into the appropriate lateral load resisting system and the interface must be well designed and detailed. Determination of the magnitude of the interface loads on concrete diaphragms are not well understood and still a matter of debate. There is no consensus of a design procedure for determining the diaphragm actions and distribution into the seismic resisting systems. In this paper, interface forces generated in floor diaphragms by asymmetrical actions of the braced framing system on each side of the building in the direction of analysis have been investigated. A numerical study using Numerical Integration Time History Analysis (NITH), has been undertaken to evaluate the interface forces of concrete floor diaphragms in a 12-story braced steel building. The results of nonlinear time history analyses using ground motion records from three different earthquakes are presented.

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Dissertations / Theses on the topic "Seismic forces"

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Leaf, Timothy D. "Investigation of the vertical distribution of seismic forces in the static force and equivalent lateral force procedures for seismic design of multistory buildings /." Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1136093311&sid=1&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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Nicknam, Ahmad. "Non-linear analysis of reinforced concrete structures subjected to transient forces." Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1432.

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Gardiner, Debra Rachel. "Design Recommendations and Methods for Reinforced Concrete Floor Diaphragms Subjected to Seismic Forces." Thesis, University of Canterbury. Department of Civil and Natural Resources Engineering, 2011. http://hdl.handle.net/10092/6993.

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The magnitudes of seismic forces which develop in floor diaphragms were investigated in this report to enable the development of a desktop floor diaphragm force design method for use in a structural design office. The general distributions of the forces which develop within the floor diaphragm were also investigated. Two and three dimensional, non-linear numerical integration time history analyses were performed to determine the trends and estimates of inertial and self-strain compatibility transfer forces within floor diaphragms. Sensitivity studies were carried out to determine which simplifying analytical modelling assumptions could be made in the analytical models. It was found that foundation flexibility, shear deformations in walls and the type of plastic hinge model, all affected the magnitudes of forces within floor diaphragms. A range of buildings with different stiffness, strength, height, types of lateral force resisting systems and different locations of the building including different seismic zones and soil types were modelled with the time history analyses method. The results indicated that the magnitudes of inertial forces were primarily related to higher dynamic modes of the structure and the transfer forces were related to the lower modes of vibration of the structure. It was identified that the maximum magnitudes of inertial and transfer forces do not occur simultaneously. The results also indicated that larger inertial and transfer forces, than those predicted by the Equivalent Static Analysis method, developed in the lower levels of the buildings. From these results a static force floor diaphragm design method was developed. Comparisons were made between both the inertial and transfer floor diaphragm forces obtained from the proposed static method, to values from time history analyses. These comparisons indicated that the floor forces obtained by the proposed method were generally larger than the floor forces obtained by the time history results. Elastic and inelastic finite element analyses were used to estimate the in-plane distributions of floor diaphragm forces for floor diaphragms with different geometries and lateral force resisting elements. Comparisons were made between the total tension forces obtained from the finite element analyses and Strut and Tie Analysis methods; these comparisons indicated the relative levels of redistribution of internal forces which could induce cracking within the floor. The comparisons indicated that redistribution cracking in the floors could develop around corner columns, re-entrant corners and openings.

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Chiewanichakorn, Methee. "Stability of thin precast concrete wall panels subjected to gravity and seismic forces." Thesis, University of Canterbury. Civil Engineering, 1999. http://hdl.handle.net/10092/10450.

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The stability of thin reinforced concrete cantilever walls with lateral displacement restraint at roof level designed for limited ductility under gravity and in-plane seismic loading is investigated in this project. A large number of innovative designs of very tall and slender reinforced concrete walls have been developed in New Zealand ahead of the design standard in the past five years. In order to understand the actual wall behaviour and obtain the quantitative design verifications, limited experimental work has been performed for the past few years at the University of Canterbury. The test results of the previous experimental work are reviewed. Four slender precast concrete 1:2.5 scale walls were tested up to failure under reversed cyclic loading regime with increased displacement level. The walls were 3.75 m high, 1m long and 50 mm thick. The aspect and slenderness ratios were 3.75 and 75, respectively. The two main variables investigated were in effect the eccentric axial load ratios and the ratio between the lap splice length of the starter bars and the height to the point of inflection. Only one of the test units, which had longer lap-splice and imposed eccentric vertical load, was susceptible to lateral buckling failure due to a significant cracking in the lower half of the wall and the excessive out-of-plane displacement. The units with an artificial lap-splice (welded connection) performed well and failed due to loss of strength caused by fracturing of starter bars after being buckled under the effects of reversed cyclic loading. Failure was observed near the welds along an artificial lap splice. Twisting of the walls at the base of the walls was observed in the tests. A continuum method for the seismic design and assessment of thin precast concrete walls is proposed. The method can be applied to walls of structures designed for the range of elastic to limited ductility response.

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Harrison, Stella, and Siri Nöjd. "Influence of Foundation Modelling on the Seismic Response of a Concrete Dam." Thesis, KTH, Betongbyggnad, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-300448.

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It is of great importance to ensure the structural safety of dams during earthquakes since a failure may cause catastrophic consequences. Conventional computation of the structural response of dams is based on a simplified approach where the foundation is considered as massless. However, recent developments have produced several new analysis methods that consider the foundation mass, modelled with absorbing boundaries and free-field forces. These newer methods are intended to simulate the seismic structural response more accurately, optimize the design and minimise future unnecessary reparations. The aim of the thesis was to investigate the influence of foundation modelling in seismic time history analyses. This was done by comparing the established massless foundation approach to two approaches with foundation mass and free-field forces included; the analytical approach presented by Song et al. (2018) and the direct FE approach by Løkke (2018). Both the efficiency of the seismic wave propagation simulation and the structural response of the dam were of interest, and points on the dam and foundation were studied to accurately compare these modelling approaches. The time history analyses showed that the massless approach corresponded perfectly with the ideal theoretical velocity at the foundation surface when studying only the foundation block, as expected. The analytical and direct FE however, differed slightly from the theoretical value but still gave an accurate representation. Both methods using free-field forces obtained equivalent and realistic structural responses when studying the dam-reservoir-foundation model. The massless method however,strongly overestimated the dam response and was therefore found to not capture the actual behavior of the dam accurately, despite modifications such as increased material damping in the concrete. Additionally, another aim was to analyse the influence of modelling in 2D versus 3D for determining the dynamic characteristics of the dam such as natural frequencies and eigenmodes of the dam. These frequency analyses were made using models with and without foundation mass considered and was compared to experimental data.The massless 3D model was found to be the most effective modelling approach for deriving the dynamic characteristics of the dam since the use of a 3D model was necessary in order to study the behaviour of the whole dam and post-processing was simpler when using the massless model.
Det är nödvändigt att säkerställa dammars säkerhet mot jordbävningar i design-processen eftersom ett dammbrott kan få katastrofala konsekvenser. Traditionellt används förenklade beräkningar där dammens strukturella respons beräknas med en berggrund där bergets massa är försummad. Den senaste tiden har flera nya analysmetoder tagits fram, som tar hänsyn till bergets massa och är modellerade med absorberande randvillkor och free-field forces. De nyare metoderna förväntas modellera de seismiska krafterna mer exakt för att optimera designen och minimera onödiga reparationer. Syftet med projektet var att undersöka inverkan från olika metoders sätt att beakta berggrunden vid seismiska analyser. Det utfördes genom att jämföra den etablerade masslösa metoden med två metoder som beaktar bergmassan och free-fieldforces; den analytiska metoden av Song et al. (2018) och Direct FE-metoden av Løkke (2018). Både effektiviteten i den seismiska vågutbredningssimuleringen och dammens strukturella respons var av intresse. Modelleringsmetoderna jämfördes genom att studera punkter på både dammen och berget. När enbart berggrunden studerades med den masslösa metoden så erhölls, som förväntat, god överenstämmelse med den ideala teoretiska hastigheten på bergsytan. De analytiska och Direct FE metoderna skiljde sig marginellt från det teoretiska värdet men gav fortfarande en korrekt hastighet på bergsytan. Vid analys av modeller med dam och reservoar inkluderade, gav metoderna som använde free-field forces ekvivalenta och realistiska strukturella responser. Den masslösa metoden däremot, överskattade kraftigt dammens respons och ansågs därför inte modelleradet verkliga beteendet hos dammen på ett korrekt sätt, trots modifieringar med ökad materialdämpning i betongen. Ett annat syfte var att analysera påverkan av modellering i 2D kontra 3D för att bestämma dammens dynamiska egenskaper, som egenfrekvenser och egenmoder. Dessa frekvensanalyser gjordes med hjälp av modeller som både beaktade och försummade bergets massa, och jämfördes med experimentella data. Den masslösa 3D-modellen visade sig vara den mest effektiva modelleringsmetoden för att erhållade dynamiska egenskaperna hos dammen. Det eftersom en 3D-modell var nödvändig för att studera hela dammens beteende och hantering av utdata var förenklad vid användning av den masslösa modellen.

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Niraula, Manjil. "BEHAVIOR AND DESIGN OF THE CRITICAL MEMBER IN STRUCTURES WITH IN-PLANE DISCONTINUOUS BRACED FRAMES." OpenSIUC, 2020. https://opensiuc.lib.siu.edu/theses/2751.

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When a structure with an in-plane discontinuous frame is used, a discontinuous load path is formed due to the irregularity. This is continuous load path can lead to the failure of certain elements and the structure as a whole when the structure is exposed to lateral loading. In this study, an in-plane discontinuous frame structure is exposed to gravity as well as lateral loading due to which a discontinuous load path is formed. Due to the discontinuous load path, higher value of axial load is developed on a beam which is generally designed considering it as a flexural member. The main objective of this thesis is to determine if the beam can be designated as the critical member in the in-plane discontinuous frame and the comparison of the critical element with the corresponding element in a frame that has no structural irregularities. The objective is also to design the critical member considering it as a beam-column element considering the combined effect of bending and compression.

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Michel, Kenan. "Distribution of Lateral Forces on Reinforced Masonry Bracing Elements Considering Inelastic Material Behavior - Deformation-Based Matrix Method -." Technische Universität Dresden, 2021. https://tud.qucosa.de/id/qucosa%3A75156.

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The main goal of CIC-BREL project (Cracked and Inelastic Calculation of BRacing Elements) is to develop an analytical method to distribute horizontal forces on bracing elements, in this case reinforced masonry shear walls, of a building considering the cracked and inelastic state of material. The moment curvature curve of the wall section is created first depending on the section geometry and material properties of both the masonry units and steel reinforcement. This curve will start with an elastic material behavior, then continue in inelastic material behavior where the masonry crushes and the steel start to yield, until the maximum bending moment M_p is reached. Due to reinforced masonry wall ductility, post maximum capacity is also considered assuming a maximum curvature of 0.1%. From the moment curvature curve, the force displacement curve could be extracted depending on the wall height and wall boundary conditions. Matrix formulation has been developed for both elastic and damaged stiffness matrix, considering different boundary conditions. Fixed-fixed boundary condition which usually exists at the middle stories or last story with strong top diaphragm, fixed-pinned which is the case of the last story that has a relatively soft top diaphragm, and pinned-fixed in the first story case. Other boundary conditions could be considered depending on the degree of fixation on the wall both ends at the top and the bottom. The matrix formulation combined with the force-displacement curve which considers different material stages (elastic, inelastic, ductile post peak force) is used to define forces in each bracing element even after elastic behavior. After elastic phase of each wall the stiffness of the element will degrade leading to a less portion of the total lateral force; other elastic walls, i.e., stronger walls, will receive more portion of the total force leading to a redistribution of the total force. This process will be iterated until the total force is distributed on each bracing element depending on the wall section state: elastic, inelastic and ductile post-peak capacity. Flowcharts clearly will show this process. Finally, a Fortran code is developed to show examples using this method. The developed analytical method will be verified by the results of shake table tests held at the University of California in San Diego, USA. Last test performed in the year 2018 uses T-section reinforced masonry walls, subjected to shakings with increased intensity. The total applied force for each shaking could be defined depending on the structural weight and shaking intensity (acceleration). The damage and displacement at each intensity has been recorded and evaluated. Depending on these test results, the results of the analytically developed method will be compared and evaluated. Total system displacement at different lateral load values has been compared for analytical calculations and shake table tests; furthermore, each wall state at increased load has been compared, good agreement could be noticed.:Acknowledgement 5 1. Introduction 7 1.1. State of the Art 9 1.2. Elastic Formulae 9 1.3. Example, Elastic Calculation 12 1.3.1. Stiffnesses of the System 13 1.3.2. Torsion due to Eccentric Lateral Loading 14 1.3.3. Distribution of the Lateral Load on Wall “j” and Floor “i” 15 2. Force Displacement Curve of RM Shear Wall 19 2.1. Introduction 19 2.2. Cantilever Wall 19 2.2.1. Cantilever Elastic Wall 19 2.2.2. Cantilever Inelastic Wall 21 2.2.3. Cantilever Post-Peak Wall 22 2.3. Fixed-Fixed Wall 23 2.3.1. Fixed-Fixed Elastic Wall 23 2.3.2. Fixed-Fixed Inelastic Wall 24 2.3.3. Fixed-Fixed Post-Peak Wall 26 2.4. Moment – Curvature Analysis 26 2.5. Example, Rectangle Cross Section, Cantilever 29 a) Moment Curvature Curve 29 b) Force Displacement Curve 32 2.6. Example, Rectangle Cross Section, Fixed-Fixed 33 a) Moment Curvature Curve 33 b) Force Displacement Curve 33 2.7. Example, T Cross Section, Cantilever 35 a) Moment Curvature Curve 35 b) Force Displacement Curve 41 2.8. Example, T Cross Section, Fixed-Fixed 43 a) Moment Curvature Curve 43 b) Force Displacement Curve 43 3. Matrix Formulation 47 3.1. Procedure 47 3.2. Structure Discretization 47 3.3. Element, i.e.; Wall, Local Stiffness Matrix 48 3.4. Stiffness Matrix of Fixed-Pinned Beam 52 3.4.1. Elastic 52 3.4.2. Pre-Peak Inelastic 54 3.4.3. Post-Peak Inelastic 55 3.4.4. Normal Force Part in the Stiffness Matrix 56 3.5. Stiffness Matrix of Pinned-Fixed Beam 57 3.5.1. Elastic 57 3.5.2. Post-Peak Inelastic 57 3.6. Stiffness Matrix of Fixed-Fixed Beam 58 3.6.1. Elastic 58 3.6.2. Post-Peak Inelastic 60 3.7. Summary of Stiffness Matrices 61 3.7.1. Fixed-Fixed 61 3.7.2. Fixed-Pinned 62 3.7.3. Pinned-Fixed 63 3.8. Transformation Matrix 63 3.9. Assemble the Structure Stiffness Matrix 65 3.10. Assemble the Structure Nodal Vector 66 3.11. Solve, Get Nodal Displacements and Forces 66 4. Matrix Formulation and Deformation Based Method 69 4.1. Elastic Method in Distributing Lateral Force 69 4.2. Elastic and Inelastic Method in Distributing Lateral Force 70 5. Shake Table Tests 73 5.1. Introduction 73 5.2. Design of Test Structure 73 5.3. Material Properties 75 5.4. Tests and Observations 75 5.4.1. Tests up to Mul-90% 76 5.4.2. Tests with Mul-120% 76 5.4.3. Tests with Mul-133% 76 5.5. Deformations 77 6. Verification 81 6.1. T Cross Section, Dimensions, Reinforcement and Materials 81 6.2. Moment Curvature Curve 82 6.3. Force Displacement Curve 85 6.4. Force Displacement Curve of the Structure 88 7. Conclusions and Suggestions 91 8. References 93 Appendix 1, Timoshenko Beam 95 • Fixed-Fixed 95 • Fixed-Pinned 95 • Pinned-Fixed 96 Appendix 2, Bernoulli Beam 97 • Fixed-Fixed 97 • Fixed-Pinned 97 • Pinned-Fixed 98

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Diaz, Calderon Alvaro Emilio, and Ventocilla Brigitte Carolina Meniz. "Evaluación estructural de reservorios apoyados de concreto armado en Lima Metropolitana considerando la norma ACI 350-06 y las normativas peruanas." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2019. http://hdl.handle.net/10757/626005.

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En la presente tesis se ha desarrollado la evaluación estructural de cinco reservorios circulares del tipo apoyado, construidos entre los años 1977 y 1997, ubicados en zonas de alto riesgo sísmico en Lima Metropolitana y ubicados en suelos medianamente rígidos, con el objetivo de evidenciar si estas estructuras continúan conservando un diseño sísmico adecuado en base a los requerimientos sísmicos actuales, y por ende si serán capaces de resistir un evento sísmico severo y continuar con el servicio. Para poder modelar y determinar la respuesta de los se reservorios se empleó el modelo equivalente de Housner, obteniendo así la masa impulsiva y convectiva, modelado en el programa SAP2000 con ayuda de las normas ACI 350.3-06 y E.030. En cuanto a la determinación de las fuerzas resistentes, para poder realizar la evaluación estructural correspondiente, se utilizó la norma peruana E.060-2009 Concreto Armado, con la cual se obtuvo dichas fuerzas y se realizaron las verificaciones estructurales. Con respecto a los resultados de las verificaciones realizadas, se observó que los reservorios en estudio no mantienen un diseño estructural adecuado en cuanto a las solicitaciones sísmicas actuales. Estas deficiencias se plasman en déficit de refuerzo horizontal por corte en muros, cuantía mínima vertical por corte en muros, refuerzo en la base del muro por momento tangencial, armadura requerida en la viga collarín, y refuerzo en el extremo de la cúpula por tracción radial; por lo que estas estructuras, ante la presencia de un evento sísmico severo, se encuentran expuestas a presentar fallas estructurales.
In the present thesis has been carried out the structural assessment of five round ground concrete tanks, built between 1977 and 1997, and located in high seismic risk areas in Lima Metropolitana in moderately rigid soils, with the objective of demonstrating if these structures still preserve an adequate structural design base on the current standards and consequently, if they will be able to withstand a severe seismic event and, hence, continue with their service. In order to model and determine the response of the tanks, the Housner’s rigid equivalent model was used, obtaining this way the impulsive and convective masses, which were modeled in the software SAP2000 with the ACI 350.3-06 standard and the E.030 Peruvian standard. Regarding on the determination of the resistant forces, in order to carry out the corresponding structural evaluation, the Peruvian standard “Concreto Armado E.060” was utilized. With regard to the results of the verifications carried out, it was observed that the reservoirs under study do not maintain an adequate structural design in terms of the current seismic solicitations. These deficiencies are reflected in horizontal reinforcement deficit by shear force on the walls, minimum amount of vertical rebar by shear on the walls, reinforcement in the base of the wall by tangential bending moment, rebar required in the beam by radial tensile force, and rebar in the end of the dome by radial traction; so these structures, in the presence of a severe seismic event, are exposed to structural failures.
Tesis

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Yzema, Fritz Alemagne. "États limites ultimes de cadres en acier isolés sismiquement avec des amortisseurs élastomères et des contreventements en chevrons." Mémoire, Université de Sherbrooke, 2014. http://savoirs.usherbrooke.ca/handle/11143/5347.

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Résumé : Ce projet de maîtrise s’intéresse au comportement ultime d’une structure en acier, contrôlée sismiquement par des amortisseurs élastomères et des contreventements en chevron. Les séismes peuvent causer des dommages considérables quand les infrastructures et les bâtiments ne sont pas construits selon les normes et les techniques appropriées. Par conséquent, réduire l’impact des séismes revient particulièrement à construire des ouvrages sécuritaires en tenant compte bien entendu du paramètre économique. Ainsi Gauron, Girard, Paultre et Proulx ont étudié en 2009, un système de reprise de forces latérales, constitué uniquement de treventements en chevron montés en série avec des amortisseurs en caoutchouc naturel fibré ayant de nombreux avantages. Premièrement, le système reste élastique sous le séisme de design en réduisant les efforts sismiques linéaires par un facteur supérieur à R[indice inférieur d] = 3 par rapport à un cadre conventionnel. Deuxièmement, il est capable de contrôler les déplacements sous la limite du CNBC 2010 (Code National du Bâtiment du Canada 2010), et même de réduire ces derniers dans certains cas. Par conséquent, il permet de réduire les sections des poutres et des poteaux des cadres par rapport à une structure conventionnelle ainsi que les coûts de réparation après un séisme. Toutefois, le comportement à l’état limite ultime d’un tel système, ses limites et ses réserves de sécurité restaient à déterminer. Ainsi, l’objectif global de ce projet de recherche est de déterminer les différents mécanismes de ruine possibles de ce système, d’établir des limites et réserves de sécurité, et de préciser, après avoir formulé certaines recommandations, à quelles conditions il peut être utilisé dans le dimensionnement de nouvelles structures. Pour atteindre les objectifs fixés, deux essais quasi statiques ont été réalisés sur deux cadres en acier dimensionnés avec le système. Des essais dynamiques ont aussi été réalisés afin d’avoir les propriétés viscoélastiques des amortisseurs. Le premier essai a mis en évidence un mécanisme de ruine inattendu et prématuré qui a souligné un défaut majeur dans les connexions des diagonales avec l’amortisseur. Le second essai a révélé un des mécanismes de ruine envisagés initialement où le caoutchouc se déchire après l’initiation du flambement dans la diagonale comprimée. Les résultats expérimentaux ont montré que l’amortisseur constitue le maillon faible du système, et que des efforts parasites peuvent réduire significativement la capacité portante des structures dimensionnées avec un tel système. Dans les deux cas, les résultats ont montré que la méthode de dimensionnement du système tel qu’elle est définie actuellement mérite d’être améliorée. En ce sens, des recommandations relatives au dimensionnement des différents éléments des structures dimensionnées avec le système ont été élaborées, particulièrement en ce qui concerne le caoutchouc et les connexions. // Abstract : This thesis focuses on the ultimate behavior of steel structures, controlled seismically by elastomeric dampers and chevron bracings. Earthquakes can cause considerable damages when infrastructures and buildings are not built considering appropriate standards and technics. Therefore, mitigating the impact of earthquakes means essentially building safe structures by taking account of economic parameters too. Thus Gauron, Girard, Paultre and Proulx studied in 2009 a seismic force resisting system consisting only of chevron braces connected in series with fiber-reinforced natural rubber dampers that offers many benefits. First, the system remains elastic under the design earthquake by reducing linear seismic efforts by a factor of R[subscript d] = 3 compared to a conventional frame. Secondly, it allows to control the displacements under the limits of NBCC 2010 (National Building Code of Canada 2010), and even to reduce them in some cases. Therefore, it allows a reduction of sections of beams and columns of conventional frames and it prevents repairing costs of the structure after an earthquake. However, the ultimate limit state behavior of this system, its limitations and safety reserves have not been determined yet. Thus, the overall objective of this project is to determine the different possible failure mechanisms of the system, to set its limits and safety reserves, and to state after some recommendations, how it can be used in the design of new structures. To achieve these objectives, two quasi static tests were performed on two steel frames designed with the new system. Dynamic tests were also conducted to get the viscoelastic properties of the damping material. The first quasi static test revealed an unexpected and premature failure mechanism that pointed out a major flaw in the connections of the braces with the damper. The second test revealed one of the failure mechanisms originally expected where the rubber tears after buckling of the compression brace. The experimental results have shown that the damper is the weak element in the system, and that additional forces can significantly reduce the structural capacity of structures designed with the system. In both cases, the results have shown that the actual design method of the system should be improved. Thus, recommendations for the design of elements of structures designed with this system have been developed, particularly with regard to the rubber and brace connections.

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Manafpour, Alireza. "Force and displacement-based seismic design of RC buildings." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398834.

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Books on the topic "Seismic forces"

1

Seismic and wind forces: Structural design examples. Country Club Hills, IL: International Code Council, 2012.

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Alan, Williams. Seismic and wind forces: Structural design examples. Country Club Hills, Ill: International Code Council, 2003.

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Alan, Williams. Seismic and wind forces: Structural design examples. 3rd ed. Country Club Hills, Ill: International Code Council, 2007.

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Emerick, Shannon Anderson. Wood platform construction and its superior resistance to seismic forces. Pullman, Wash: International Marketing Program for Agricultural Commodities & Trade, College of Agriculture & Home Economics, Washington State University, 1992.

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V, Leyendecker Edgar, and Geological Survey (U.S.), eds. USGS Spectral response maps and their relationship with seismic design forces in building codes. [Denver, CO]: U.S. Geological Survey, 1995.

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1953-, Baradar Majid, ed. Seismic design of building structures: A professional's introduction to earthquake forces and design details. 8th ed. Belmont, CA: Professional Publications, 2001.

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M, McMullin Kurt, ed. Seismic design of building structures: A professional's introduction to earthquake forces and design details. 9th ed. Belmont, CA: Professional Publications, 2008.

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Lindeburg, Michael R. Seismic design of building structures: A professional's introduction to earthquake forces and design details. Belmont, CA: Professional Publications, 2011.

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Seismic design of building structures: A professional's introduction to earthquake forces and design details. 6th ed. Belmont, CA: Professional Publications, 1994.

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R, Lindeburg Michael, ed. Seismic design of building structures: A professional's introduction to earthquake forces and design details. 5th ed. Belmont, CA: Professional Publications, 1990.

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Book chapters on the topic "Seismic forces"

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Charney, Finley A. "Diaphragm Forces." In Seismic Loads, 181–84. Reston, VA: American Society of Civil Engineers, 2015. http://dx.doi.org/10.1061/9780784413524.ch22.

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Daniel, C., G. Hemalatha, Ajita Magdalene, D. Tensing, and S. Sundar Manoharan. "Magnetorheological Damper for Performance Enhancement Against Seismic Forces." In Facing the Challenges in Structural Engineering, 104–17. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61914-9_9.

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Varga, Péter, and Erik Grafarend. "Influence of Tidal Forces on the Triggering of Seismic Events." In Pageoph Topical Volumes, 55–63. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-96277-1_6.

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Jablonski, A. M., and J. H. Rainer. "Effect of seismic input on hydrodynamic forces acting on gravity dams." In Earthquake Engineering, edited by Shamim A. Sheikh and S. M. Uzumeri, 157–64. Toronto: University of Toronto Press, 1991. http://dx.doi.org/10.3138/9781487583217-021.

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Vyas, Dhananjay, Jithin P. Zachariah, Alla Kranthi Kumar, and Ravi S. Jakka. "Role of Hydrodynamic Forces on the Seismic Response of a Dam." In Lecture Notes in Civil Engineering, 423–35. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1579-8_33.

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Froio, D., A. U. Bariletti, M. Eusebio, R. Previtali, and E. Rizzi. "Direct Method for Dynamic Soil-Structure Interaction Based on Seismic Inertia Forces." In Lecture Notes in Civil Engineering, 807–20. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51085-5_45.

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Ahmad, Faisal, Nikhil A. Jambhale, and Tejas D. Doshi. "Investigate the Effect of Isolation System for RC Structure Under Seismic Forces." In Lecture Notes in Civil Engineering, 455–71. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3371-4_40.

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Kakatkar, Varsha, Nikhil Jambhale, Veerendrakumar C. Khed, and Shivanand Mendigeri. "Comparative Study on Position of Floating Column for RCC Multistorey Building Subjected to Seismic Forces." In Lecture Notes in Civil Engineering, 219–30. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-12011-4_17.

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Panchal, Sanish, Kushang Prajapati, and Suhasini M. Kulkarni. "Behavior of Single Pylon of Air Cooled Condenser Support Structure Under Seismic and Wind Forces." In Engineering Vibration, Communication and Information Processing, 87–97. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1642-5_8.

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Kaloji, Amit A., Nikhil A. Jambhale, and Tejas D. Doshi. "Investigate the Effect of Floating Column and Composite Transfer Beam Under the Influence of Seismic Forces." In Lecture Notes in Civil Engineering, 403–18. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3371-4_36.

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Conference papers on the topic "Seismic forces"

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Kai, Satoru, and Akihito Otani. "Study on Dynamic Alternating Load on Piping Seismic Response." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45287.

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An inertia force resulting from excitation of a structure exposed to ground motion due to an earthquake excites the structure excited and generates a seismic force on the structure. The handling of seismic forces has been being discussed in terms of how the seismic force on a piping controls the deformation of the piping, load-controlled or displacement-controlled. A seismic design code for nuclear facilities applied in Japan qualifies this kind of seismic forces as primary stress components which shall be limited to prevent any plastic collapse, on the assumption that the seismic force mainly consists of load-controlled loads and the deformation due to earthquakes is caused by the loads. On the other hand, theoretically, an inertia force generated from response acceleration under harmonic vibration condition of a structure tends to oppose a response displacement of the structure. Since the inertia force produced from the response acceleration counteracts the response displacement, it is assumed that unstable failures represented by plastic collapse are hardly broken out on such a condition. To figure out the tendency between those forces, several time history analysis using simplified piping models, the vibration characteristic of which were arranged to have various specified natural frequency and specified damping ratio, were performed and the relationship between the element forces which result from response displacements and the inertia forces due to response accelerations have been investigated. The result of this investigation is expected to be useful to improve current seismic design methodology in the future.

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Kastrati, Arbëresha. "Yu81 vs Eurocode in calculation of seismic forces." In University for Business and Technology International Conference. Pristina, Kosovo: University for Business and Technology, 2018. http://dx.doi.org/10.33107/ubt-ic.2018.77.

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Zha, Jin-xing. "Lateral Spreading Forces on Bridge Piles." In Workshop on Seismic Performance and Simulation of Pile Foundations in Liquefied and Laterally Spreading Ground. Reston, VA: American Society of Civil Engineers, 2005. http://dx.doi.org/10.1061/40822(184)7.

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Otani, Akihito, and Satoru Kai. "Study on Dynamic Response by Alternating and Static Load." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63363.

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An inertia force in a seismic response of structure excited by an earthquake generates the seismic force acting on the structure. The handling of seismic forces has been being discussed in terms of how the seismic force on a piping controls the deformation of the piping, load-controlled or displacement-controlled. A seismic design code for nuclear facilities applied in Japan qualifies this kind of seismic forces as primary stress components which shall be limited to prevent any plastic collapse, on the assumption that the seismic force mainly consists of load-controlled loads and the deformation due to earthquakes is caused by the loads. The authors studied about a condition of plastic collapse occurrence by the relationship between response acceleration and displacement of SDOF system. And it was represented in a previous paper that plastic collapse hardly occurred to soft structure due to an inertia force generated from response acceleration tended to oppose a response displacement. Several elastic plastic response analyses of elastic-perfectly-plastic SDOF model are performed with applying dynamic load and both of dynamic load and static load. By the results of the analyses, three forces, which are inertia force, element force and external force, are investigated the relations against the deformation.

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Kornfield, Laurence, and Patrick Buscovich. "Use of Garage Doors to Resist Lateral Forces." In ATC and SEI Conference on Improving the Seismic Performance of Existing Buildings and Other Structures. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41084(364)111.

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Lin, Yongliang, Mengxi Zhang, and Xinxing Li. "Evaluation of Seismic Displacement of Quay Walls for the Passive Case Under Earthquake and Tsunami." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20198.

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Prediction of the seismic rotational displacements of retaining wall under passive condition is an important aspect of design in earthquake prone region. In this paper, a rotating block method is developed to calculate the rotational displacements of quay walls based on rigid foundations under seismic loading and tsunami for the passive earth pressure condition. The proposed method considers the combined effect of the seismic forces, hydrostatic and hydrodynamic forces and tsunami force acting on the quay wall. Variations of different parameters involved in the analysis suggest sensitiveness of the rotational displacement and provides a better guideline for design.

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Wei, Yu. "Loess Slope Stability Analysis under the Action of Seismic Forces." In 2015 8th International Conference on Intelligent Computation Technology and Automation (ICICTA). IEEE, 2015. http://dx.doi.org/10.1109/icicta.2015.135.

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Martin, Felix. "Is Roof Eave Blocking Required to Transmit Wind/Seismic Forces?" In Structures Congress 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41171(401)54.

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Abdujabarov, Abdukhamid, Mashkhurbek Mekhmonov, and Farkhod Eshonov. "Design for reducing seismic and vibrodynamic forces on the shore support." In 2021 ASIA-PACIFIC CONFERENCE ON APPLIED MATHEMATICS AND STATISTICS. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0089531.

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Min-Su Park, Youn-Ju Jeong, and Young-Jun You. "Numerical analysis of an offshore platform with partial porous cylinders due to wave excitation forces and seismic forces." In OCEANS 2012. IEEE, 2012. http://dx.doi.org/10.1109/oceans.2012.6405135.

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Reports on the topic "Seismic forces"

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Gunay, Selim, Fan Hu, Khalid Mosalam, Arpit Nema, Jose Restrepo, Adam Zsarnoczay, and Jack Baker. Blind Prediction of Shaking Table Tests of a New Bridge Bent Design. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, November 2020. http://dx.doi.org/10.55461/svks9397.

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Considering the importance of the transportation network and bridge structures, the associated seismic design philosophy is shifting from the basic collapse prevention objective to maintaining functionality on the community scale in the aftermath of moderate to strong earthquakes (i.e., resiliency). In addition to performance, the associated construction philosophy is also being modernized, with the utilization of accelerated bridge construction (ABC) techniques to reduce impacts of construction work on traffic, society, economy, and on-site safety during construction. Recent years have seen several developments towards the design of low-damage bridges and ABC. According to the results of conducted tests, these systems have significant potential to achieve the intended community resiliency objectives. Taking advantage of such potential in the standard design and analysis processes requires proper modeling that adequately characterizes the behavior and response of these bridge systems. To evaluate the current practices and abilities of the structural engineering community to model this type of resiliency-oriented bridges, the Pacific Earthquake Engineering Research Center (PEER) organized a blind prediction contest of a two-column bridge bent consisting of columns with enhanced response characteristics achieved by a well-balanced contribution of self-centering, rocking, and energy dissipation. The parameters of this blind prediction competition are described in this report, and the predictions submitted by different teams are analyzed. In general, forces are predicted better than displacements. The post-tension bar forces and residual displacements are predicted with the best and least accuracy, respectively. Some of the predicted quantities are observed to have coefficient of variation (COV) values larger than 50%; however, in general, the scatter in the predictions amongst different teams is not significantly large. Applied ground motions (GM) in shaking table tests consisted of a series of naturally recorded earthquake acceleration signals, where GM1 is found to be the largest contributor to the displacement error for most of the teams, and GM7 is the largest contributor to the force (hence, the acceleration) error. The large contribution of GM1 to the displacement error is due to the elastic response in GM1 and the errors stemming from the incorrect estimation of the period and damping ratio. The contribution of GM7 to the force error is due to the errors in the estimation of the base-shear capacity. Several teams were able to predict forces and accelerations with only moderate bias. Displacements, however, were systematically underestimated by almost every team. This suggests that there is a general problem either in the assumptions made or the models used to simulate the response of this type of bridge bent with enhanced response characteristics. Predictions of the best-performing teams were consistently and substantially better than average in all response quantities. The engineering community would benefit from learning details of the approach of the best teams and the factors that caused the models of other teams to fail to produce similarly good results. Blind prediction contests provide: (1) very useful information regarding areas where current numerical models might be improved; and (2) quantitative data regarding the uncertainty of analytical models for use in performance-based earthquake engineering evaluations. Such blind prediction contests should be encouraged for other experimental research activities and are planned to be conducted annually by PEER.

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Michel, Kenan. Performance Based Seismic Design of Lateral Force Resisting System. University of California, San Diego, October 2020. http://dx.doi.org/10.25368/2020.126.

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Decato, Stephen N., Donald G. Albert, Frank E. Perron, Carbee Jr., and David L. Short-Range Seismic and Acoustic Signature Measurements Through Forest. Fort Belvoir, VA: Defense Technical Information Center, May 2005. http://dx.doi.org/10.21236/ada434934.

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Sweeney, J., and P. Harben. OSI Passive Seismic Experiment at the Former Nevada Test Site. Office of Scientific and Technical Information (OSTI), November 2010. http://dx.doi.org/10.2172/1018759.

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Hobbs, T. E., J. M. Journeay, A. S. Rao, L. Martins, P. LeSueur, M. Kolaj, M. Simionato, et al. Scientific basis of Canada's first public national seismic risk model. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/330927.

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Natural Resources Canada, in partnership with the Global Earthquake Model Foundation, has prepared a public Canadian Seismic Risk Model to support disaster risk reduction efforts across industry and all levels of government, and to aid in Canada's adoption of the Sendai Framework for Disaster Risk Reduction. Developing this model has involved the creation of a national exposure inventory, Canadian specific fragility and vulnerability curves, and adjustment of the Canadian Seismic Hazard Model which forms the basis for the seismic provisions of the National Building Code of Canada. Using the Global Earthquake Model Foundation's OpenQuake Engine (OQ), risk modelling is completed using both deterministic and probabilistic risk calculations, under baseline and simulated retrofit conditions. Output results are available in all settled regions of Canada, at the scale of a neighbourhood or smaller. We report on expected shaking damage to buildings, financial losses, fatalities, and other impacts such as housing disruption and the generation of debris. This paper documents the technical details of the modelling approach including a description of novel datasets in use, as well as preliminary results for a magnitude 9.0 earthquake on the Cascadia megathrust and nation-wide 500 year expected probabilistic losses. These kinds of results, such as earthquake scenario impacts, loss exceedance curves, and annual average losses, provide a quantitative base of evidence for decision making at local, regional, and national levels.

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Kafka, A. L. Database Relations for Seismic Phases Reported by Stations in the Former Soviet Union. Fort Belvoir, VA: Defense Technical Information Center, September 1993. http://dx.doi.org/10.21236/ada274832.

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Madsen, Robert L., Thomas A. Castle, and Benjamin W. Schafer. Seismic Design of Cold-Formed Steel Lateral Load-Resisting Systems: A Guide for Practicing Engineers. National Institute of Standards and Technology, August 2016. http://dx.doi.org/10.6028/nist.gcr.16-917-38.

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Speicher, Matthew S., Ivana Olivares, and Benjamin W. Schafer. Seismic Evaluation of a 2-Story Cold-Formed Steel Framed Building using ASCE 41-17. National Institute of Standards and Technology, September 2020. http://dx.doi.org/10.6028/nist.tn.2116.

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Wu, Yingjie, Selim Gunay, and Khalid Mosalam. Hybrid Simulations for the Seismic Evaluation of Resilient Highway Bridge Systems. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, November 2020. http://dx.doi.org/10.55461/ytgv8834.

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Bridges often serve as key links in local and national transportation networks. Bridge closures can result in severe costs, not only in the form of repair or replacement, but also in the form of economic losses related to medium- and long-term interruption of businesses and disruption to surrounding communities. In addition, continuous functionality of bridges is very important after any seismic event for emergency response and recovery purposes. Considering the importance of these structures, the associated structural design philosophy is shifting from collapse prevention to maintaining functionality in the aftermath of moderate to strong earthquakes, referred to as “resiliency” in earthquake engineering research. Moreover, the associated construction philosophy is being modernized with the utilization of accelerated bridge construction (ABC) techniques, which strive to reduce the impact of construction on traffic, society, economy and on-site safety. This report presents two bridge systems that target the aforementioned issues. A study that combined numerical and experimental research was undertaken to characterize the seismic performance of these bridge systems. The first part of the study focuses on the structural system-level response of highway bridges that incorporate a class of innovative connecting devices called the “V-connector,”, which can be used to connect two components in a structural system, e.g., the column and the bridge deck, or the column and its foundation. This device, designed by ACII, Inc., results in an isolation surface at the connection plane via a connector rod placed in a V-shaped tube that is embedded into the concrete. Energy dissipation is provided by friction between a special washer located around the V-shaped tube and a top plate. Because of the period elongation due to the isolation layer and the limited amount of force transferred by the relatively flexible connector rod, bridge columns are protected from experiencing damage, thus leading to improved seismic behavior. The V-connector system also facilitates the ABC by allowing on-site assembly of prefabricated structural parts including those of the V-connector. A single-column, two-span highway bridge located in Northern California was used for the proof-of-concept of the proposed V-connector protective system. The V-connector was designed to result in an elastic bridge response based on nonlinear dynamic analyses of the bridge model with the V-connector. Accordingly, a one-third scale V-connector was fabricated based on a set of selected design parameters. A quasi-static cyclic test was first conducted to characterize the force-displacement relationship of the V-connector, followed by a hybrid simulation (HS) test in the longitudinal direction of the bridge to verify the intended linear elastic response of the bridge system. In the HS test, all bridge components were analytically modeled except for the V-connector, which was simulated as the experimental substructure in a specially designed and constructed test setup. Linear elastic bridge response was confirmed according to the HS results. The response of the bridge with the V-connector was compared against that of the as-built bridge without the V-connector, which experienced significant column damage. These results justified the effectiveness of this innovative device. The second part of the study presents the HS test conducted on a one-third scale two-column bridge bent with self-centering columns (broadly defined as “resilient columns” in this study) to reduce (or ultimately eliminate) any residual drifts. The comparison of the HS test with a previously conducted shaking table test on an identical bridge bent is one of the highlights of this study. The concept of resiliency was incorporated in the design of the bridge bent columns characterized by a well-balanced combination of self-centering, rocking, and energy-dissipating mechanisms. This combination is expected to lead to minimum damage and low levels of residual drifts. The ABC is achieved by utilizing precast columns and end members (cap beam and foundation) through an innovative socket connection. In order to conduct the HS test, a new hybrid simulation system (HSS) was developed, utilizing commonly available software and hardware components in most structural laboratories including: a computational platform using Matlab/Simulink [MathWorks 2015], an interface hardware/software platform dSPACE [2017], and MTS controllers and data acquisition (DAQ) system for the utilized actuators and sensors. Proper operation of the HSS was verified using a trial run without the test specimen before the actual HS test. In the conducted HS test, the two-column bridge bent was simulated as the experimental substructure while modeling the horizontal and vertical inertia masses and corresponding mass proportional damping in the computer. The same ground motions from the shaking table test, consisting of one horizontal component and the vertical component, were applied as input excitations to the equations of motion in the HS. Good matching was obtained between the shaking table and the HS test results, demonstrating the appropriateness of the defined governing equations of motion and the employed damping model, in addition to the reliability of the developed HSS with minimum simulation errors. The small residual drifts and the minimum level of structural damage at large peak drift levels demonstrated the superior seismic response of the innovative design of the bridge bent with self-centering columns. The reliability of the developed HS approach motivated performing a follow-up HS study focusing on the transverse direction of the bridge, where the entire two-span bridge deck and its abutments represented the computational substructure, while the two-column bridge bent was the physical substructure. This investigation was effective in shedding light on the system-level performance of the entire bridge system that incorporated innovative bridge bent design beyond what can be achieved via shaking table tests, which are usually limited by large-scale bridge system testing capacities.

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Wozniakowska, P., D. W. Eaton, C. Deblonde, A. Mort, and O. H. Ardakani. Identification of regional structural corridors in the Montney play using trend surface analysis combined with geophysical imaging, British Columbia and Alberta. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328850.

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The Western Canada Sedimentary Basin (WCSB) is a mature oil and gas basin with an extraordinary endowment of publicly accessible data. It contains structural elements of varying age, expressed as folding, faulting, and fracturing, which provide a record of tectonic activity during basin evolution. Knowledge of the structural architecture of the basin is crucial to understand its tectonic evolution; it also provides essential input for a range of geoscientific studies, including hydrogeology, geomechanics, and seismic risk analysis. This study focuses on an area defined by the subsurface extent of the Triassic Montney Formation, a region of the WCSB straddling the border between Alberta and British Columbia, and covering an area of approximately 130,000 km2. In terms of regional structural elements, this area is roughly bisected by the east-west trending Dawson Creek Graben Complex (DCGC), which initially formed in the Late Carboniferous, and is bordered to the southwest by the Late Cretaceous - Paleocene Rocky Mountain thrust and fold belt (TFB). The structural geology of this region has been extensively studied, but structural elements compiled from previous studies exhibit inconsistencies arising from distinct subregions of investigation in previous studies, differences in the interpreted locations of faults, and inconsistent terminology. Moreover, in cases where faults are mapped based on unpublished proprietary data, many existing interpretations suffer from a lack of reproducibility. In this study, publicly accessible data - formation tops derived from well logs, LITHOPROBE seismic profiles and regional potential-field grids, are used to delineate regional structural elements. Where seismic profiles cross key structural features, these features are generally expressed as multi-stranded or en echelon faults and structurally-linked folds, rather than discrete faults. Furthermore, even in areas of relatively tight well control, individual fault structures cannot be discerned in a robust manner, because the spatial sampling is insufficient to resolve fault strands. We have therefore adopted a structural-corridor approach, where structural corridors are defined as laterally continuous trends, identified using geological trend surface analysis supported by geophysical data, that contain co-genetic faults and folds. Such structural trends have been documented in laboratory models of basement-involved faults and some types of structural corridors have been described as flower structures. The distinction between discrete faults and structural corridors is particularly important for induced seismicity risk analysis, as the hazard posed by a single large structure differs from the hazard presented by a corridor of smaller pre-existing faults. We have implemented a workflow that uses trend surface analysis based on formation tops, with extensive quality control, combined with validation using available geophysical data. Seven formations are considered, from the Late Cretaceous Basal Fish Scale Zone (BFSZ) to the Wabamun Group. This approach helped to resolve the problem of limited spatial extent of available seismic data and provided a broader spatial coverage, enabling the investigation of structural trends throughout the entirety of the Montney play. In total, we identified 34 major structural corridors and number of smaller-scale structures, for which a GIS shapefile is included as a digital supplement to facilitate use of these features in other studies. Our study also outlines two buried regional foreland lobes of the Rocky Mountain TFB, both north and south of the DCGC.

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