Bibliographies thématiques / COLLAPSE ASSESSMENT

Littérature scientifique sur le sujet « COLLAPSE ASSESSMENT »

Auteur : Grafiati
Publié le 11 septembre 2023

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Articles de revues sur le sujet "COLLAPSE ASSESSMENT"

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Thorson, James T., Trevor A. Branch et Olaf P. Jensen. « Using model-based inference to evaluate global fisheries status from landings, location, and life history data ». Canadian Journal of Fisheries and Aquatic Sciences 69, no 4 (avril 2012) : 645–55. http://dx.doi.org/10.1139/f2012-016.

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Assessing fishery collapses worldwide is hindered by the lack of biomass data for most stocks, leading to the use of landings-based proxies or the assumption that existing stock assessments are globally representative. We argue that the use of sparse assessments to evaluate fishery status requires model-based inference because assessment availability varies spatially and temporally, and we derive a model that extrapolates from assessment results to available landings, life history, and location data. This model uses logistic regression to classify stocks into different prediction bins and estimates the probability of collapse in each using cross-validation. Results show that landings, life history, and location are informative to discriminate among different probabilities of collapse. We find little evidence that regions with fewer assessments have a greater proportion of collapsed stocks, while acknowledging weak inferential support regarding regions with one or fewer assessments. Our extrapolation suggests that 4.5%–6.5% of stocks defined by landings data are collapsed, but that this proportion is increasing. Finally, we propose a research agenda that combines stock assessment and landings databases while overcoming limitations in each.
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Asnawi Subki, Nur Ezzaryn, Hazrina Mansor, Yazmin Sahol Hamid et Gerard Parke. « Progressive Collapse Assessment : A review of the current energy-based Alternate Load Path (ALP) method ». MATEC Web of Conferences 258 (2019) : 02012. http://dx.doi.org/10.1051/matecconf/201925802012.

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The Alternate Load Path (ALP) is a useful method that has generated a considerable recent research interest for the assessment of progressive collapse. The outcome of the ALP analysis can be assessed either using the force-based approach or the energy-based approach. The Unified Facilities Criteria (UFC- 4- 023-03) of progressive collapse guideline - have outlined that the force-based approach can either be analysed using static or dynamic analysis. The force-based approach using static analysis is preferable as it does not require a high level of skill and experience to operate the software plus no effort is required in scrutinising the validity of the analysis results output. However, utilising the static approach will eliminate the inertial effect in capturing the actual dynamic response of the collapsed structure. In recent years, the development of the energy-based progressive collapse assessment is attracting widespread interest from researchers in the field; as the approach can produce a similar structural response with the force-based dynamic analysis by only using static analysis. Most of the current energy-based progressive collapse assessments are developed following the requirements which are given in the progressive collapse guidelines provided by the Unified Facilities Criteria. However, little attention is given to the development of the energy-based approach using the Eurocode standards as a base guideline. This article highlights the merits of utilising the energy-based approach against the force-based approach for a collapsed structure and explains the collapse mechanism of a steel frame in the perspective of the energy concept. The state of the art of energy-based progressive collapse assessment for a structural steel frame is reviewed. The comprehensive review will include insights on the development of the energy-based method, assumptions, limitations, acceptance criterion and its applicability with the European standards. Finally, potential research gaps are discussed herein.
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Leite da Silva, A. M., I. P. Coutinho, A. C. Zambroni de Souza, R. B. Prada et A. M. Rei. « Voltage collapse risk assessment ». Electric Power Systems Research 54, no 3 (juin 2000) : 221–27. http://dx.doi.org/10.1016/s0378-7796(99)00087-5.

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Seyed Khoei, Amir, Reza Akbari, Shahrokh Maalek et Alireza Gharighoran. « Assessment of Design and Retrofitting Solutions on the Progressive Collapse of Hongqi Bridge ». Shock and Vibration 2020 (15 septembre 2020) : 1–13. http://dx.doi.org/10.1155/2020/4932721.

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In 2009, the Hongqi Bridge, a multispan reinforced concrete bridge located in Zhuzhou, Hunan Province, China, collapsed progressively in the form of domino, due to extreme effect of deck to pier, during demolition process of the bridge. In this study, progressive collapse of Hongqi Bridge was investigated using nonlinear dynamic analysis in the Applied Element Method, which has been proven as one of the best methods that can follow the collapse behavior of structures. Good agreements were obtained between numerical results and field observations as well as previously reported results. After verifying the bridge collapse procedure, the effects of different alternatives for superstructure and substructure systems on the progressive collapse procedure were investigated. In addition, application of restrainers at the connection of deck to abutment was studied as an effective solution in order to prevent collapse propagation and to minimize associated damages. The results of the study showed that all chosen methods and factors could be helpful and effective in the procedure of collapse propagation for this kind of bridge.
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Kouris, Emmanouil-Georgios, Leonidas-Alexandros S. Kouris, Avraam A. Konstantinidis, Chris G. Karayannis et Elias C. Aifantis. « Assessment and Fragility of Byzantine Unreinforced Masonry Towers ». Infrastructures 6, no 3 (9 mars 2021) : 40. http://dx.doi.org/10.3390/infrastructures6030040.

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The seismic response of five cultural heritage towers erected between the 10th and 19th century AD are investigated herein. Firstly, their architectural and modal characteristics were studied in the light of seismic events that hit the monuments. There exist several historical reports of strong earthquakes, as well as damaged structures and collapses. The limit analysis is adopted to examine the post-elastic behavior of the towers up to collapse due to out-of-plane failure. Recurrent damage modes were collected from recent earthquakes and a classification of four possible collapse mechanisms in towers and slender masonry structures is here proposed: overturning, separation of perpendicular walls, diagonal cracking, and dislocation of the belfry. A thorough examination of the towers under investigation verified the proposed damage classification. The capacity curves were derived combining the capacity curves of each of the collapse mechanisms. Damage thresholds were defined on these curves in correspondence with damage states. The studied group of structures is representative of a wider typology. A statistical approach was adopted to describe damage with seismic intensity, and vulnerability curves were generated. The results of this study will improve the understanding of the performance and the collapse mechanisms of slender masonry structures under seismic loading and provide a characterization of seismic vulnerability for the studied cultural heritage types of towers.
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Gesierich, Wolfgang, Konstantinos Samitas, Frank Reichenberger et Juergen Behr. « Collapse phenomenon during Chartis collateral ventilation assessment ». European Respiratory Journal 47, no 6 (13 avril 2016) : 1657–67. http://dx.doi.org/10.1183/13993003.01973-2015.

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Chartis is increasingly used for bronchoscopic assessment of collateral ventilation before endobronchial valve (EBV) treatment for severe emphysema. Its prognostic value is, however, limited by the airway collapse phenomenon. The frequency and clinical significance of the collapse phenomenon remain largely unknown.We performed a retrospective analysis of 92 patients undergoing Chartis evaluation under spontaneous breathing (n=55) or jet ventilation (n=37) from May 2010 to November 2013. Collateral ventilation status (positive/negative/collapse phenomenon/unclear) was reassessed and correlated with high-resolution computed tomography (HRCT) fissure analysis and clinical response.In the absence of the collapse phenomenon, the predictive value of Chartis measurements and HRCT fissural analysis was comparable. The collapse phenomenon was observed in 31.5% of all assessments, and was more frequent in lower lobes (44.9% versus 16.9% in upper lobes) and under jet ventilation (41.4% versus 22.1% under spontaneous breathing). 69.8% of lobes with the collapse phenomenon had complete fissures. Most patients with the collapse phenomenon in the target lobe and complete fissures treated with EBVs were responders (n=11/15). All valve-treated collapse phenomenon patients with fissure defects were nonresponders (n=3).In the absence of the collapse phenomenon Chartis measurement is reliable to predict response to valve treatment. In patients with the collapse phenomenon, treatment decisions should be based on HRCT detection of fissure integrity. Chartis assessment should be performed under spontaneous breathing.
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Zareian, Farzin, et Helmut Krawinkler. « Assessment of probability of collapse and design for collapse safety ». Earthquake Engineering & ; Structural Dynamics 36, no 13 (2007) : 1901–14. http://dx.doi.org/10.1002/eqe.702.

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Temelli, Uğur Emre, Cüneyt Öngören et Baris Sayin. « Damage assessment of a cement plant partially collapsed depending on various causes ». Journal of Structural Engineering & ; Applied Mechanics 5, no 2 (30 juin 2022) : 62–76. http://dx.doi.org/10.31462/jseam.2022.02062076.

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This study aims at examining the possible causes of the brittle collapse of a tertiary air duct system under vertical loads. Problems related to the design and construction stages were examined. The entire process was illustrated using a tertiary air duct case study in a cement plant. In the plant, the tertiary air duct collapsed without any earthquake, blast, or impact effects. The current study includes a field study, examination of an original/revised design project, and numerical simulation. In the first stage of the study, the existing state of the collapsed system and its compliance with static and mechanical projects were examined. Secondly, a two-dimensional finite element analysis was performed to determine project eligibility. The causes of the system were determined based on the data obtained in the former stages. The results showed that the causes of partial collapse included project errors, construction faults, and project incompatibilities.
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Liu, Min. « Pulldown Analysis for Progressive Collapse Assessment ». Journal of Performance of Constructed Facilities 29, no 1 (février 2015) : 04014027. http://dx.doi.org/10.1061/(asce)cf.1943-5509.0000459.

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Newton, Adrian C. « Strengthening the Scientific Basis of Ecosystem Collapse Risk Assessments ». Land 10, no 11 (16 novembre 2021) : 1252. http://dx.doi.org/10.3390/land10111252.

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Progress is being made in assessing the conservation status of ecosystems, notably through initiatives such as the IUCN Red List of Ecosystems (RLE) and the NatureServe Conservation Status Assessment (NCS). Both of these approaches consider conservation status in terms of the risk of ecosystem collapse. However, the scientific understanding of ecosystem collapse is still at a relatively early stage. Consequently, concerns have been raised regarding the scientific basis of ecosystem conservation assessments focusing on collapse risk. Here I explore how these concerns might potentially be addressed by considering how the concept is defined, and by briefly reviewing the theoretical basis of ecosystem collapse. I then examine the implications of recent research results for the design of ecosystem collapse risk assessments, and the challenges identified in those assessments conducted to date. Recommendations are made regarding how collapse risk assessments might be strengthened based on current scientific understanding, and how this understanding could be improved by further research. In addition, I examine the potential implications for conservation policy and practice if the scientific basis of collapse risk assessments is not strengthened in this way.
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Thèses sur le sujet "COLLAPSE ASSESSMENT"

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Stephen, David Ojonimi. « Progressive collapse assessment of structures ». Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/17769/.

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The collapse of buildings over the last century as a result of abnormal loads has renewed interest in the field of structural engineering. Key events such as the disproportionate collapse of the Ronan Point building in London, the collapse of the Alfred Murray Building and the World Trade Centre are structural failures that have triggered more research into progressive collapse. Consequently, new design guidelines around the globe with a prescriptive recommendation for improving structural integrity based on tying force provision have been developed. However, in existing design guidelines and codes throughout the world, there is a lack of a codified modelling technique for progressive collapse. As a result of this limitation, researchers adopt different methods. Generally, during the progressive collapse, structural members experiencing significant displacements and rotations, while the beam-column connections are subjected to large tensile forces not envisaged at the conventional design phase. Hence, this study presents an assessment of the effect of column removal time, the modelling techniques and the susceptibility of simple connections designed to Eurocode 3 Part: 1-8 to progressive collapse. A computationally efficient approach and column removal time for progressive collapse assessment are proposed. The findings show that a braced framed system is likely to exhibit at least 35% progressive collapse when compared with a moment resisting frame system using the joint displacement and rotation criteria. Furthermore, the research shows that the UK tie provision in EN1991-1-7 underestimates the magnitude of the catenary force developed under the progressive collapse scenario. Consequently, the connection is disposed to progressive collapse with the shear force in the column and catenary action in the beam as the critical internal forces. Based on this assessment, five times the tensile force specified in EC3 for tensile force connection design checks is recommended. Shear force in the column and catenary force action in the beam are the internal governing forces that determine the maximum dynamic amplification factor of a simple connection. The work provides evidence that the tie beam-column web connection at the corner column is more critical under progressive collapse scenario as compared with the primary beam. Column web failure in yielding is attributed to the large catenary force developed in the tie beam connected to the web of the column.
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Vlassis, Anastasios G. « Progressive collapse assessment of tall buildings ». Thesis, Imperial College London, 2007. http://hdl.handle.net/10044/1/1342.

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The events of 11 September 2001 have instigated a comprehensive debate among the structural engineering community regarding the performance of tall buildings under extreme loading conditions such as blast, impact or fire. The main issues that have been identified include the dynamic robustness of such buildings, the parameters that could possibly initiate progressive collapse following the extreme event, and the design guidance that needs to be introduced in order for buildings to survive such events and assure life safety of their occupants. Since the structural components of buildings subject to extreme loading events are likely to undergo large inelastic deformations, which can induce excessive ductility demands in the joint regions of the members involved, the behaviour and modelling of joints is discussed in detail. With respect to design recommendations, this thesis proposes a multi-level framework for progressive collapse assessment of building structures subject to sudden column loss, which is the design scenario adopted by most recent guidelines to assess the potential of multi-storey buildings for progressive collapse. The proposed framework offers a rational and practical means for assessing structural robustness at various levels of structural idealisation, it accommodates both simplified and detailed models of the nonlinear structural response, and importantly it moves the debate on structural robustness towards the quantifiable. Application of the new approach is demonstrated with reference to steel-framed composite buildings with partial-strength joints. Furthermore, a methodology is developed, based on the proposed assessment framework for sudden column loss, to consider the impact of floor failure on a lower floor, in order to establish whether this would in fact trigger progressive collapse. Application of this methodology is also illustrated by means of a case study, where consideration is given to a floor grillage system subject to impact of the floor above, and the ability of the impacted floor members to sustain the dynamically induced loads associated with various impact scenarios is thoroughly examined. From the presented application studies, important conclusions are drawn relating to the inherent robustness of steel-framed structures, the factors influencing this robustness, and the adequacy of current regulations for the avoidance of progressive collapse.
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SOUZA, ANTONIO CARLOS ZAMBRONI DE. « AN ASSESSMENT OF THE VOLTAGE COLLAPSE PHENOMENON ». PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1990. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=10240@1.

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Restrições econômicas e ecológicas têm limitado o investimento em novas usinas e linhas de transmissão de energia elétrica. Com os sistemas de potência trabalhando bastante carregados, o risco da ocorrência da instabilidade de tensão se acentua. Neste trabalho estabeleceram-se as características operacionais do fenômeno do colapso de tensão, e sua similaridade e diferença em relação ao problema da estabilidade angular. Forma desenvolvidos métodos para avaliar um ponto de operação do sistema quanto à proximidade da ocorrência do fenômeno. Os resultados foram comparados. Finalmente, foi abordado o problema da prevenção do colapso
Investiments on new generators and transmission lines for electrical power systems have been limited due to economical and environmental constraints. This dissertation established the operational characteristics of the voltage collapse phenomenon, as well as pointed out similarities and differences in relation to the angular stability problem. Voltage collapse assessment methods were developed and results compared. Finallu, the collapse prevention problem was mentioned.
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Beson, Simon Derek. « Progressive collapse assessment of lightweight ship structures ». Thesis, University of Newcastle upon Tyne, 2011. http://hdl.handle.net/10443/1445.

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This thesis investigates the progressive collapse behaviour of lightweight ship hull girders including the effects of compartment level buckling modes. An extension to the progressive collapse methodology is proposed, which has capabilities to predict the compartment strength of a lightweight aluminium midship section. Nonlinear finite element analysis is used to validate both the progressive collapse methodology and the analytical approach proposed for determining the buckling capacity of orthogonally stiffened substructures within the hill girder compartment. The research has been undertaken due to the continued growth in the size of large lightweight craft in both commercial and naval vessels, combined with increasing operability requirements for these vessels. The development of large and lightweight marine structures, predominantly built from aluminium alloy, has raised important issues regarding the response of the hull girder under primary hull girder bending.
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Li, Kai. « Collapse Experiments and Assessment of Masonry Wall Buildings ». The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1503265342241364.

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Takagi, Jirō. « Collapse performance assessment of steel-framed buildings under fires / ». May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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Mehrotra, Anjali Abhay. « A computational tool for seismic collapse assessment of masonry structures ». Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/287464.

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Earthquakes represent a serious threat to the safety of masonry structures, with failure of these constructions under the influence of seismic action generally occurring via specific, well-documented collapse mechanisms. Analysis and assessment of these collapse mechanisms remains a challenge - while most analysis tools are time-consuming and computationally expensive, typical assessment methods are too simplified and often tend to underestimate the dynamic resistance of the structures. This dissertation aims to bridge the gap between the two through the development of a computational tool for the seismic collapse assessment of masonry structures, which uses rocking dynamics to accurately capture large displacement response, without compromising on computational efficiency. The tool could be used for rapid evaluation of critical mechanisms in a structure in order to prioritise retrofit solutions, as well as for code-based seismic assessment. The framework of the tool is first presented, wherein the rocking equations of motion are derived for a range of different collapse mechanisms, for any user-defined structural geometry, using as a starting point a geometric model of the structure in Rhino (a 3D CAD software). These equations of motion are then exported for solution to MATLAB. As a number of collapse mechanisms take place above ground level, a methodology to account for ground motion amplification effects is also proposed, while in the case of comparison of multiple different mechanisms, an algorithm to automatically detect critical mechanisms is presented. These developments make it possible to rapidly conduct a seismic analysis of structures with complicated three-dimensional geometries. However, the rocking equations of motion utilised thus far assume that the interfaces between the masonry macro-elements are rigid, which is not the case in reality. Thus, a flexible interface model is introduced, where the interfaces are characterised by a finite stiffness and compressive strength. This modelling strategy results in an inward shift of the rocking rotation points, and expressions are derived for these shifting rotation points for different interface geometries. The rocking equations of motion are also re-derived to account for the influence of the continuously moving hinges. However, the new equations tend to be highly non-linear - especially in the case of more complex collapse mechanisms. Thus to reduce computational burden, the semi-flexible interface model is proposed, which accounts for the shifting hinges in a more simplified manner than its fully-flexible counterpart. These new analytical models enable more accurate prediction of the seismic response of real-world structures, where interface flexibility tends to have a significant influence on dynamic response, while material damage in the form of crushing of the masonry also reduces dynamic resistance. The ability of the tool to be used for both seismic analysis and assessment is finally demonstrated by using it to perform a rocking dynamics-based analysis as well as a code-based seismic assessment of the walls of a historic earthen structure.
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Navarro-Perez, Rogelio. « Voltage collapse proximity assessment for the operational planning of power systems ». Thesis, Imperial College London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241887.

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Song, Brian Inhyok. « EXPERIMENTAL AND ANALYTICAL ASSESSMENT ON THE PROGRESSIVE COLLAPSE POTENTIAL OF EXISTING BUILDINGS ». The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1281712538.

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Verma, Abhishek. « Seismic design and collapse-performance assessment of steel plate shear wall structures ». Thesis, IIT Delhi, 2019. http://eprint.iitd.ac.in:80//handle/2074/8132.

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Livres sur le sujet "COLLAPSE ASSESSMENT"

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Timmins, Graham. The collapse of the German Democratic Republic : An assessment. Huddersfield : The University, 1994.

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Predicting burning building collapse : Fireground risk management. Tulsa, Okla : PennWell, 2012.

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Great Britain. Department for Communities and Local Government, dir. Manual for the systematic risk assessment of high-risk structures against disproportionate collapse. London : Institution of Structural Engineers, 2013.

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1918-, Pierson Charles Thomas, et Geological Survey (U.S.), dir. Mineral resource assessment of undiscovered solution-collapse breccia pipe uranium deposits in the Coconino National Forest, Arizona. [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

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International Institute for Strategic Studies., dir. European security after the cold war : An assessment of the dangers to peace in Europe since the Soviet collapse, and of the Western responses they require. London : Brassey's for the International Institute for Strategic Studies, 1992.

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Magazine photo collage : A multicultural assessment and treatment technique. New York : Brunner/Mazel Publishers, 1993.

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Frezza, Eldo. Healthcare Collapse : Where We've Been and Where We Need to Go. Productivity Press, 2018.

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Frezza, Eldo. Healthcare Collapse : Where We've Been and Where We Need to Go. Productivity Press, 2018.

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Healthcare Collapse : Where We've Been and Where We Need to Go. Taylor & Francis Group, 2018.

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Anderson, Jeffrey J. 11. The European Union, the Soviet Union, and the End of the Cold War. Oxford University Press, 2017. http://dx.doi.org/10.1093/hepl/9780199570829.003.0012.

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This chapter examines the connection between German unification and the economic and monetary union (EMU), with particular emphasis on the relationship between the acceleration of European integration in the late 1980s and the seismic geopolitical shifts in Central and Eastern Europe, culminating in the collapse of the Soviet Union in 1991. Following a review of relations between the European Community (EC) and the Soviet Union on the eve of those momentous events, the chapter explains how the rapid integration in Western Europe became intertwined with disintegration in Central and Eastern Europe. It shows that the collapse of the Soviet bloc had a profound impact on the European Union as ten newly-independent Central and Eastern European states clamoured for membership. The chapter concludes with an assessment of EU enlargement in the post-Cold War period.
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Chapitres de livres sur le sujet "COLLAPSE ASSESSMENT"

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Adam, Christoph, et Luis F. Ibarra. « Seismic Collapse Assessment ». Dans Encyclopedia of Earthquake Engineering, 1–25. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-36197-5_248-1.

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Adam, Christoph, et Luis F. Ibarra. « Seismic Collapse Assessment ». Dans Encyclopedia of Earthquake Engineering, 2729–52. Berlin, Heidelberg : Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-35344-4_248.

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Krawinkler, Helmut, et Dimitrios G. Lignos. « How to Predict the Probability of Collapse of Non-Ductile Building Structures ». Dans Seismic Risk Assessment and Retrofitting, 343–65. Dordrecht : Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2681-1_17.

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Tezcan, Semih S., Ihsan Engin Bal et Fatma Gulten Gulay. « Risk Management and a Rapid Scoring Technique for Collapse Vulnerability of RC Buildings ». Dans Seismic Risk Assessment and Retrofitting, 71–89. Dordrecht : Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2681-1_4.

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McCombie, J. S. L., et M. R. M. Spreafico. « Capital Controls and the Icelandic Banking Collapse : An Assessment ». Dans Financial Liberalisation, 225–64. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41219-1_6.

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Talaat, Mohamed M., et Khalid M. Mosalam. « How to Simulate Column Collapse and Removal in As-built and Retrofitted Building Structures ? » Dans Seismic Risk Assessment and Retrofitting, 427–52. Dordrecht : Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2681-1_20.

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Buyukozturk, Oral, et Tzu-Yang Yu. « A Novel Structural Assessment Technique to Prevent Damaged FRP-Wrapped Concrete Bridge Piers from Collapse ». Dans Seismic Risk Assessment and Retrofitting, 127–41. Dordrecht : Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2681-1_7.

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Pomonis, A., A. Kappos, F. Karababa et G. Panagopoulos. « Seismic Vulnerability and Collapse Probability Assessment of Buildings in Greece ». Dans Human Casualties in Earthquakes, 153–70. Dordrecht : Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9455-1_11.

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Lignos, Dimitrios G., Helmut Krawinkler et Andrew S. Whittaker. « Collapse Assessment of Steel Moment Resisting Frames Under Earthquake Shaking ». Dans Computational Methods in Applied Sciences, 1–19. Dordrecht : Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-0053-6_1.

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Hartmann, D., M. Breidt, V. Nguyen, F. Stangenberg, S. Höhler, K. Schweizerhof, S. Mattern, G. Blankenhorn, B. Möller et M. Liebscher. « On Fundamental Concept of Structural Collapse Simulation Taking Into Account Uncertainty Phenomena ». Dans Damage Assessment and Reconstruction after War or Natural Disaster, 169–91. Dordrecht : Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2386-5_7.

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Actes de conférences sur le sujet "COLLAPSE ASSESSMENT"

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Lo, K. L. « Different aspects of voltage collapse assessment and enhancement ». Dans IEE Colloquium on Voltage Collapse. IEE, 1997. http://dx.doi.org/10.1049/ic:19970567.

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Salim, Nur Ashida, Muhammad Murtadha Othman, Ismail Musirin et Mohd Salleh Serwan. « Cascading Collapse Assessment Considering Hidden Failure ». Dans 2011 First International Conference on Informatics and Computational Intelligence (ICI). IEEE, 2011. http://dx.doi.org/10.1109/ici.2011.59.

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« Towards an Accurate Determination of Collapse Vulnerable Reinforced Concrete Buildings ». Dans SP-297 : Seismic Assessment of Existing Reinforced Concrete Buildings. American Concrete Institute, 2014. http://dx.doi.org/10.14359/51686907.

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Okamoto, Asao, Yasuhiro Ohtake, Isoharu Nishiguchi et Mitsuru Aoki. « Effects of Peak Strain on Collapse Load Assessment ». Dans ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-1765.

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This paper discusses effects of peak plastic strain on collapse load assessment by Finite Element Analysis (FEA). A pressurized disk with a fixed end was investigated by limit analysis with various mesh division. The effect of peak strain at the periphery was evaluated how it would affect on the collapse load. It was found that not only the peak strain varied with the mesh size, but also the resulted plastic hinge changed its shape in the cross-sectional area. Nevertheless, the utmost load supported by elastic-perfectly plastic material was not affected much with the differences. In a limit analysis criterion, it is sometimes stipulated to terminate the calculation at the load increment when specified displacement or strain has been developed, so as to use the definitely lower bound of the true collapse load. Among such criteria, Twice-Elastic-Slope Method, which focuses on the gross displacement of the structure, gave comparable solutions for the various mesh divisions. On the contrary, when the peak strain was taken to be a controlling factor, the results were highly dependent on the modeling.
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Ragni, Laura, Fabrizio Scozzese, Fabrizio Gara et Enrico Tubaldi. « Dynamic identification and collapse assessment of Rubbianello Bridge ». Dans IABSE Symposium, Guimarães 2019 : Towards a Resilient Built Environment Risk and Asset Management. Zurich, Switzerland : International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/guimaraes.2019.0619.

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<p>This paper investigates the causes of failure of Rubbianello Bridge, a multi-span masonry arch bridge located in Central Italy, which suffered the collapse of two of the seven spans due to foundation scour during a very severe flood in December 2013 and the collapse of two more spans during another major flood event in 2016. An accurate nonlinear 3D model of the bridge is developed. The elastic properties of the model are calibrated based on both material tests and an experimental campaign carried out for the dynamic identification (in terms of vibration frequencies and modal shapes) via operational modal analysis of the remaining part of the bridge. A numerical simulation of the scour hole progression is performed in order to identify the collapse mechanism of the bridge under the first major flood and estimate the level of scour that caused the bridge failure.</p>
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« "Collapse Assessment of Non-Ductile, Retrofitted and Ductile Reinforced Concrete Frames" ». Dans SP-297 : Seismic Assessment of Existing Reinforced Concrete Buildings. American Concrete Institute, 2014. http://dx.doi.org/10.14359/51686905.

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DI PRISCO, M., M. COLOMBO, P. MARTINELLI et D. CORONELLI. « Annone overpass : assessment of reinforcement damage effects on collapse ». Dans 9th International Conference On Concrete Under Severe Conditions - Environment and Loading. MENVIA, 2019. http://dx.doi.org/10.31808/5ce8b27a1c23164ad13b5239.

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Chenouda, Mouchir, et Ashraf Ayoub. « Collapse Assessment of Degrading MDOF Structures under Seismic Excitations ». Dans Structures Congress 2006. Reston, VA : American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40889(201)18.

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Khandelwal, Kapil, et Sherif El-Tawil. « Assessment of Progressive Collapse Residual Capacity Using Pushdown Analysis ». Dans Structures Congress 2008. Reston, VA : American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/41016(314)94.

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King, Stephanie A., et David J. Stevens. « Risk Assessment to Support Design to Resist Disproportionate Collapse ». Dans Structures Congress 2009. Reston, VA : American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41031(341)205.

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Rapports d'organisations sur le sujet "COLLAPSE ASSESSMENT"

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Krauthammer, Ted, Robert L. Hall, Stanley C. Woodson, James T. Baylot, John R. Hayes et Young Sohn. Development of Progressive Collapse Analysis Procedure and Condition Assessment for Structures. Fort Belvoir, VA : Defense Technical Information Center, mai 2002. http://dx.doi.org/10.21236/ada526955.

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Chen, Qishi, Joe Zhou, Duane DeGeer, Ola Bjornoy et Richard Verley. JTM13-CCP Collapse of Corroded Pipelines. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), avril 2001. http://dx.doi.org/10.55274/r0011820.

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This paper presents preliminary numerical and experimental results obtained in an attempt to develop practical, reliability-based local buckling and collapse criteria for onshore and offshore pipelines that have experienced some form of metal-loss corrosion. The project was carried out in three phases involving finite element analysis, large-scale testing, and development of design criteria using reliability methodology. This paper summarizes the first two phases of this project including a characterization of corrosion defects, an assessment of the sensitivity of corrosion features based on finite element predictions, and test results of full-scale line pipe specimens.
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Du, Xinlong, et Jerome F. Hajjar. Structural Performance Assessment of Electrical Transmission Networks for Hurricane Resilience Enhancement. Northeastern University, août 2022. http://dx.doi.org/10.17760/d20460693.

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Hurricanes are one of the main causes for blackouts and related infrastructure damage in the United States. Electrical transmission towers, which are key parts of the electrical transmission networks, are vulnerable to high wind speeds during storms. Collapse of transmission towers may lead to a loss of functionality of transmission lines. This research focuses on regional analysis of electrical transmission networks under hurricane hazards through developing beam elements for analyzing transmission towers, selection of hurricane wind records that incorporate uncertainty quantification, generating collapse fragility curves for transmission towers, and regional damage assessment of transmission networks.
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Ko, Yu-Fu, et Jessica Gonzalez. Fiber-Based Seismic Damage and Collapse Assessment of Reinforced Concrete Single-Column Pier-Supported Bridges Using Damage Indices. Mineta Transportation Institute, août 2023. http://dx.doi.org/10.31979/mti.2023.2241.

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Near-fault earthquakes can have major effects on transportation systems due to the structural damage they impose on bridges. Therefore, it is imperative to assess the seismic damage of bridges appropriately, and this research focuses on reinforced concrete (RC) bridges. This research advances the seismic performance assessment of RC single-column pier-supported bridges with flexural failure under near-fault ground motion by use of ductility coefficients and damage indices. The methodology included modeling fiber-based nonlinear beam-column elements to simulate the damage development process of RC bridge piers under earthquake loadings, considering the global buckling of longitudinal steel bars, examining the cracking and spalling of cover concrete, and analyzing the effects of bond-slip. The tensile strain represented the damage of the longitudinal bars while the compression strain represented the cover concrete damage. Two innovative nonlinear fiber-based finite element models (FEMs) were developed: Model 1 (bond-slip excluded) and Model 2 (bond-slip included). Nonlinear static cyclic pushover analyses and nonlinear response history analyses were conducted. The simulation results were compared with available pseudo-dynamic test results. Model 1 provided a more ideal prognosis on the seismic performance of RC single-column pier-supported bridges under near-fault ground motion. The proposed damage indices can indicate the damage state at any stage and the gradual accumulation of damage in RC bridge piers, which are more convincing than most other indices in the literature. The proposed fiber-based nonlinear FEMs, together with the use of ductility coefficients and proposed damage indices, can also assist engineers and researchers in simulating the seismic behavior and assessing the damage state of RC bridge columns in a computationally effective manner which can empower engineers to identify and prioritize RC bridges for seismic retrofit and maintenance.
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Denys, Waele et Lefevre. L52239 Input to Code Revision for Interaction of Girth Weld Defects under Plastic Collapse Conditions. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), mars 2005. http://dx.doi.org/10.55274/r0011348.

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A pipeline girth weld may contain one single or multiple defects. If discrete multiple notches occur, current codes define by applying proximity rules the defect dimensions to be used in an ECA. The defect interaction rules contained in pipeline specific standards are based on linear elastic fracture mechanics with conservative approximations. Similar solutions for failure by plastic collapse are non-existent. In this study, using experimental data of wide plate tests, interaction criteria for ductile girth welds containing multiple coplanar surface breaking defects are proposed. Based on a simple plastic collapse assessment, defect length limits ensuring the onset of remote yielding in the pipe bodies are calculated. A two-tier assessment procedure, based on a comparison of the sum of the individual defect lengths with these characteristic limits, is proposed. If the total defect length is smaller than the characteristic defect length limit interaction will not occur. The defect length limit ensuring remote yielding in the case of multiple defects is dependent on the spacing between defects. The defect length limits also incorporate the effect of yield-to-tensile ratio. The performance behaviour of wide plates with coplanar surface-breaking defects is compared with existing and proposed interaction criteria. The assessment shows that the proposed defect interaction procedure is less conservative than the rules currently embodied in pipeline specific standards.
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Perdigão, Rui A. P., et Julia Hall. Spatiotemporal Causality and Predictability Beyond Recurrence Collapse in Complex Coevolutionary Systems. Meteoceanics, novembre 2020. http://dx.doi.org/10.46337/201111.

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Causality and Predictability of Complex Systems pose fundamental challenges even under well-defined structural stochastic-dynamic conditions where the laws of motion and system symmetries are known. However, the edifice of complexity can be profoundly transformed by structural-functional coevolution and non-recurrent elusive mechanisms changing the very same invariants of motion that had been taken for granted. This leads to recurrence collapse and memory loss, precluding the ability of traditional stochastic-dynamic and information-theoretic metrics to provide reliable information about the non-recurrent emergence of fundamental new properties absent from the a priori kinematic geometric and statistical features. Unveiling causal mechanisms and eliciting system dynamic predictability under such challenging conditions is not only a fundamental problem in mathematical and statistical physics, but also one of critical importance to dynamic modelling, risk assessment and decision support e.g. regarding non-recurrent critical transitions and extreme events. In order to address these challenges, generalized metrics in non-ergodic information physics are hereby introduced for unveiling elusive dynamics, causality and predictability of complex dynamical systems undergoing far-from-equilibrium structural-functional coevolution. With these methodological developments at hand, hidden dynamic information is hereby brought out and explicitly quantified even beyond post-critical regime collapse, long after statistical information is lost. The added causal insights and operational predictive value are further highlighted by evaluating the new information metrics among statistically independent variables, where traditional techniques therefore find no information links. Notwithstanding the factorability of the distributions associated to the aforementioned independent variables, synergistic and redundant information are found to emerge from microphysical, event-scale codependencies in far-from-equilibrium nonlinear statistical mechanics. The findings are illustrated to shed light onto fundamental causal mechanisms and unveil elusive dynamic predictability of non-recurrent critical transitions and extreme events across multiscale hydro-climatic problems.
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Dinovitzer, Aaron. PR-214-114504-R02 Development of Sleeve End Fillet Weld Fitness for Service Assessment Tools. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), mai 2016. http://dx.doi.org/10.55274/r0010890.

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Pipeline defects such as cracks, dents and corrosion often require permanent pressure retaining repairs. Full encirclement metallic repair sleeves with fillet-welded end connections to the pipe-line are often used for this purpose. In-service failures have occurred at pressure retaining sleeves as a result of defects associated with the sleeve welds, such as hydrogen-induced cracks, undercut at the fillet welds and inadequate weld size. At present, accurate quantitative fitness for service assessments for circumferential defects in sleeve fillet welds are difficult to carry out due to a lack of detailed stress intensity factor solutions for finite length cracks. The primary objective of the project was to improve the assessment of circumferential defects in sleeve fillet welds through the development of more accurate stress intensity factors and plastic collapse solutions for finite length sleeve-end fillet weld toe and root cracks. The stress intensity factors were estimated using detailed finite element analysis. These factors were then used to develop simplified parametric equations which are suitable for carrying out defect assessments on a wide range of pipe and sleeve geometries. These equations can be used in the assessment of fatigue crack growth and/or fracture using failure assessment diagram methods at sleeve end fillets alongside the results developed for other structural geometries in national standards.
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Leis, B. N., et X. K. Zhu. DTRS56-03-T-0014 Corrosion Assessment Criteria for Vintage vs Modern Pipelines. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), septembre 2005. http://dx.doi.org/10.55274/r0011878.

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The appearance in the 1990s of corrosion severity assessment criteria derived consistent with the plastic-collapse theory presented the industry with an alternative to the criteria empirically evolved beginning in the 1970s. While the industry now had a less conservative alternative to their empirical counterparts, there was no basis to identify which criterion was appropriate. This project has quantitatively evaluated these two sets of criteria to establish which is valid as a function of characteristic geometric features of the corrosion as well as the vintage, grade and other metrics of the line pipe and the pipeline's service and loading. Consideration was given to the mathematical form of these criteria and their 'validation' databases, the corrosion geometry, the line pipe properties, and other factors through the use of numerical and analytical techniques and demonstration full-scale testing.
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Warke. L51822 A Limit States and Reliability-Based Girth Weld Assessment Framework for Long Pipeline Segments. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), juillet 2000. http://dx.doi.org/10.55274/r0011242.

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This report describes the development of a graphical framework enabling probabilistic assessment of surface-breaking planar defects in pipeline girth welds, in terms of multivariate limit state functions incorporating weld strength mismatch effects. This is part of an ongoing effort by the Welding Research Supervisory Committee to align girth weld fitness-for-service assessment methods with recent advancements in limit states- and reliability-based design for pipelines. A previous three-year program (PR-185-9429) by the same investigators produced a database of partial safety factors (PSFs), calibrated against a broad range of reliability targets, for use with limit state functions based on existing stress intensity (crack driving force) and plastic collapse solutions. Several inherent limitations of these solutions, including their inability to account for strength mismatch in the behavior of weld metal and heat-affected zone (HAZ) flaws, motivated the development of new relationships in the present work. The PSF-based approach to probabilistic assessment also had its limitations, namely that it did not provide all of the necessary tools to address multi-weld pipeline segments, and that it was somewhat cumbersome to apply in practice. A more direct method was therefore desired.
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Lozev. L52022 Validation of Current Approaches for Girth Weld Defect Sizing Accuracy. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), juillet 2002. http://dx.doi.org/10.55274/r0011325.

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Computational tools based on probabilistic fracture mechanics have been developed to enable reliability-based fitness-for-service assessments of flawed girth welds. The same tools are readily adapted for establishing maximum allowable defect sizes to achieve targeted weld reliability. Sensitivity studies have shown that of the various input parameter uncertainties, measured defect height often has the greatest impact on the probabilities of both fracture and plastic collapse. A reduction in sizing uncertainty should thus dramatically improve predicted reliabilities. The increasing use of mechanized ultrasonic testing (UT) in pipeline construction, driven by the demands of engineering critical assessment (ECA) -based acceptance criteria, highlights the need to quantify this uncertainty, particularly for systems incorporating pulse-echo (P/E) and time-of-flight diffraction (TOFD) methods and phased-array (PA) technology. EWI collected third-party independent data and statistically characterized the systematic and random errors in girth weld defect sizing, as measured by mechanized UT using P/E and TOFD methods, as well as PA ultrasonic technology, in support of pipeline reliability assessments.
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