Relevant bibliographies by topics / Short-term deflection

Academic literature on the topic 'Short-term deflection'

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Published: 4 June 2021
Last updated: 19 February 2022

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Journal articles on the topic "Short-term deflection"

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Du, Jin Sheng, and Hai Bin Liu. "Effect of Pier Vertical Deformations on Deflections of Main Girders for High Pier and Long-Span Continuous Rigid-Frame Bridges." Advanced Materials Research 163-167 (December 2010): 1436–39. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.1436.

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In some long-span prestressed concrete box girder bridges, excessive deflections of main girders are often observed. These unacceptable deflections have detrimental influence on the serviceability and safety of the structures. To better understand and estimate short term and long term deflections for prestressed concrete box girder bridges, pier vertical deformation and its effect on deflections of main girders of Jinghe Bridg is investigated in this paper. Piers in Jinghe Bridge are tall and the difference in height between piers up to 22 m. Analysis indicates that although the short term deformations of piers are small, the long term deformations of piers can be 3 times as large as that of short-term ones. The maximum short-term downward deflection of Jinghe Bridge caused by pier deformation for main girders is 7.7 mm and the maximum long-term downward deflection is 33.3 mm. These values are relatively small compared with the span length of the bridge. But when the deflection of the main girder itself is also included, the final total deflection of the main girder may exceed the design code limit.
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Zhang, Lei, and Jin Tian. "Short- and Long-Term Deflection of Concrete Structures." Advanced Materials Research 690-693 (May 2013): 714–19. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.714.

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The general concepts of two basic forms of deflection are summarized and the existing calculation theories of deflection are introduced; two cases of concrete structure deflection, which are short-and long-term deflection, are discussed through comparison. Further, the basic theories of deflection calculation and deflection control methods are indicated based on two different cases in this paper.
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Ghali, Amin, Mamdouh Elbadry, and Sami Megally. "Two-year deflections of the Confederation Bridge." Canadian Journal of Civil Engineering 27, no. 6 (December 1, 2000): 1139–49. http://dx.doi.org/10.1139/l00-050.

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A comprehensive research program is currently in progress to monitor and study the behavior and performance of the Confederation Bridge. Part of this program is on monitoring short- and long-term deflections to evaluate the deflection prediction techniques employed in the design of concrete structures in general and this bridge in particular. The investigation comprises measurements of parameters related to the materials used in the bridge. This paper presents some field measurements of vertical deflection as well as the results of computer analysis. Short-term deflections are measured at the time of installation of precast units and also in truck-loading tests. After completion of construction, the deflections are measured at specified intervals. The last readings reported in this paper have been taken 27 months after completion of construction. The computer program CPF (Cracked Plane Frames in prestressed concrete) is employed for analysis of the monitored part of the Confederation Bridge. The bridge is modeled as a plane frame in which the nonprestressed and prestressed steels are considered. Several analyses are performed employing the actual time-dependent concrete properties measured in the field and those calculated from the ACI Committee 209 equations and CEB-FIP Model Code. Comparisons are made between the measured and the predicted deflections. The predicted deflections are found to be in close agreement with the measured values, which indicates that the deflection prediction techniques used in design of this bridge are adequate.Key words: computer analysis, concrete bridges, Confederation Bridge, creep, deflections, field measurements, long-term, prestressed steel, segmental construction, short-term, shrinkage, time-dependent.
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El-Zeadani, Mohamed, Raizal Saifulnaz Muhammad Rashid, Mugahed Yahya Hussein Amran, Farzad Hejazi, and Mohd Saleh Jaafar. "Short-term deflection of RC beams using a discrete rotation approach." International Journal of Advanced Structural Engineering 11, no. 4 (October 22, 2019): 473–90. http://dx.doi.org/10.1007/s40091-019-00247-5.

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Abstract Quantifying the deflection of RC beams has been performed traditionally using full-interaction moment–curvature methods without considering the slip that takes place between the reinforcement and the surrounding concrete. This was commonly carried out by deriving empirically based flexural rigidities and using elastic deflection equations to predict the deformation of RC structures. However, as flexural and flexural/shear cracks form in RC beams with increase in applied load, the reinforcement steel begins to slip against the surrounding concrete surface causing the cracks to widen and ultimately increasing the deflection at mid-span. Current design rules cannot cope directly with the deformation induced by the widening of cracks. Because of that, this study focused on predicting the non-time dependent deflection of RC beams at both service and ultimate limit states using a mechanics-based discrete rotation approach. The mechanics-based solution was compared with experimental test results and well-established code methods to which a good agreement between the results was observed. The method presented accounts for the non-linear behavior of the concrete in compression, the partial-interaction behavior of the reinforcement, and the deflection was computed while considering the rotation of discrete cracks. Due to its generic nature, the method presented does not require any calibration with experimental findings on the member level, which makes it appropriate to quantify the deflection or RC structures with different types of concrete and novel reinforcement material.
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Visintin, P., D. J. Oehlers, R. Muhamad, and C. Wu. "Partial-interaction short term serviceability deflection of RC beams." Engineering Structures 56 (November 2013): 993–1006. http://dx.doi.org/10.1016/j.engstruct.2013.06.021.

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Zhuravskyi, Oleksandr, and Dmytro Smorkalov. "Investigation of single- and double-layer slabs supported on four sides." USEFUL online journal 2, no. 4 (December 29, 2018): 44–55. http://dx.doi.org/10.32557/useful-2-4-2018-0005.

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Presented method and results of experimental research of deflection of single-layer and two-layer slabs influenced by short-term lateral load. Proposed method of calculation based on the limit equilibrium method, calculation of slab deflections values by LIRA-CAD bundled software. The comparison of experimental and theoretical results of the calculation of deflections slabs.
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Duy Nguyen, Phan, Vu Hiep Dang, Ngoc Anh Vu, and Polikutin Aleksei Eduardovich. "Long-term Deflections of Hybrid GFRP/Steel Reinforced Concrete Beams under Sustained Loads." Civil Engineering Journal 6 (September 30, 2020): 1–11. http://dx.doi.org/10.28991/cej-2020-sp(emce)-01.

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One of the solutions to improve the flexural behavior of Glass fiber reinforced polymer (GFRP) reinforced concrete (RC) beams is the addition of tensile longitudinal steel reinforcement. The numerous studies to date on hybrid GFRP/steel RC elements have mainly focused on the static and short-term responses, very little work has been done regarding the long-term performance. This paper presents experimental results of time-dependent deflections of cracked GFRP and hybrid GFRP/steel RC beams during a 330-day-period in natural climate conditions. Three hybrid GFRP/steel and one GFRP RC beams with dimensions 100×200×2000 mm were tested in four-point bending. Different steel reinforcement ratios were used to evaluate the effect of the steel reinforcement on the long-term behavior of the beams. Experimental results show that the immediate deflections are inversely proportional to the additional steel reinforcement. With the same initial instantaneous deflection, the total deflection increases when increasing the steel reinforcement ratio. Also, temperature (T) and relative humidity (RH) significantly affect the long-term deflection of the tested beams. The measured long-term deflections were found to be in good agreement with the theoretical values calculated from the proposed method. However, there was an overestimation when using ACI 440.1R-15 or CSA-S806-12 procedures.
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Sherif, Alaa G., and Walter H. Dilger. "Critical review of CSA A23.3-94 deflection prediction for normal and high strength concrete beams." Canadian Journal of Civil Engineering 25, no. 3 (June 1, 1998): 474–89. http://dx.doi.org/10.1139/l97-106.

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The purpose of this paper is to critically review the provisions of CSA A23.3-94 for the deflection calculations of normal and high strength reinforced concrete beams. Comparison is made with the provisions of CEB-FIP MC 90 and EC 2 which is similar to the MC 90. Both short- and long-term deflections are discussed. Tests from the literature are used to assess the calculation methods suggested by the codes. These methods are the effective moment of inertia approach, the mean curvature approach, and the bilinear method. A parametric study is carried out to investigate the effect of the level of loading, shape of bending moment, and reinforcement ratio on the predicted deflections.Key words: code predictions, deflections, long term, reinforced concrete beams, short term.
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Liu, Jin Jun, and Tian Wen Wang. "Deflection Calculation on Reinforced Concrete Beams Strengthened by Externally Prestressing Transverse Tensioning Method." Advanced Materials Research 671-674 (March 2013): 430–36. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.430.

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Eight reinforced concrete beams (six externally reinforced and two contrast beams) were tested under primary or secondary load experiment. According to the test results, the existing specifications were applied to make calculations on short-term deflection which leaded to a large error. The secondary effect should be considered on calculating the deflection. Therefore, comparisons were made between the improved calculated value and test value on deflections of reinforced concrete beams strengthened by externally prestressed transverse tensioning method and they are in good agreement.
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Bai, Wen Hui. "Stiffness Revising to Recycled Course Aggregate Reinforced Concrete Beams under Short-Term Loading." Advanced Materials Research 168-170 (December 2010): 1443–48. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1443.

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This paper mainly studies the deflection under short-term loading of recycled course aggregate reinforced concrete beam is calculated by using of the formula of short-dated rigidity in code for design of concrete structures. According to testing the flexural performance of 6 recycled course aggregate beams with the same section size, different replacement ratio of recycled coarse aggregate of 0%, 50%, 70%, 100% respectively and different percentage reinforcement of 0.68%, 0.89%, 1.13% respectively, analyzes relation between deflection and replacement ratio of recycled coarse aggregate, deflection and percentage reinforcement, compare measured value and calculated value using of current codes and make statistical analysis this data . By regressing and analyzing the experimental data from literature, supplied short-dated rigidity modified formula of recycled course aggregate beam. The calculation results are in good agreement with the experimental data. The formula of short-dated rigidity can accurately calculate deflection under short-term loading of recycled course aggregate reinforced concrete beam, and can be referenced in engineering practice and correlative regulations.
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Dissertations / Theses on the topic "Short-term deflection"

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Darabi, Mohammadali. "Long-Term Deflection Of One-Way Concrete Slab Strips Containing Steel And GFRP Reinforcement." Thesis, Fredericton: University of New Brunswick, 2011. http://hdl.handle.net/1882/35382.

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Fibre reinforced polymers (FRP’s) are considered an alternative to steel reinforcement in concrete structures because of their noncorrosive nature and nonmagnetic properties. FRP materials are, however, brittle and have a lower stiffness compared to steel. The latter property can lead to deflection and crack control problems in FRP-reinforced concrete flexural members under service loads. A considerable amount of information is available for short-term deflection of FRP-reinforced concrete members, but data on long-term deflections are scarce. This study presents the results of monotonic (short-term) and sustained (long-term) loading tests of 12 concrete shallow beams reinforced with either steel or glass FRP (GFRP) bars. The short-term load-deflection responses of the members are evaluated using existing deflection prediction models (Branson’s and Bischoff’s), and the long-term deflection results (monitored over a period of one year) are used to evaluate the existing ACI code and CSA standard approaches for estimating long-term deflection. The GFRP-reinforced concrete beams exhibited greater amounts of both immediate deflection (under sustained load) and long-term deflections over time, than the steel-reinforced concrete beams. The long-term deflections of both the steel- and GFRP-reinforced concrete beams are overestimated when using the ACI and CSA approaches. Although ACI Committee 440 recommends use of lower values of the long-term deflection multiplier for GFRP-reinforced concrete beams, results obtained from this study suggest that the same longterm multiplier values may be used for GFRP- and steel-reinforced concrete beams loaded at between 115 to 157 days of concrete age.
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Tabassum, Javeria, and javeriaajaz@yahoo co in. "Analysis of current methods of flexural design for high strength concrete beams." RMIT University. Civil, Environmental & Chemical Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080725.143153.

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Considerable amount of research was carried out into the properties and structural performance of high strength concrete for more than few decades. Whilst this research has produced relevant and useful results, there are several properties of high strength concrete like compressive and tensile strengths, stiffness, durability etc. that need to be evaluated and investigated to determine an accurate representation for the determination of different structural properties of beams made of high strength concrete. For this purpose, an investigation into the behaviour of beams made of higher concrete strengths has been carried out and conclusions drawn for the design of high strength concrete beams in flexure. Experimental data from previous research was considered for the study to establish some understanding of flexural behavior of HSC beams. A number of spreadsheets in Excel were developed using available data and various graphs were plotted to determine the accuracy of the code provisions for calculating the ultimate moment capacity of beams. A study on flexural ductility of beams has been carried out using a computer program FRMPHI which generates moment-curvature curves for the beams. Ductility has been studied using ductility factors. The influence of ductility on the value of the depth of neutral axis has been analysed and discussed. A chapter on the short-term deflection of simply supported high strength concrete beams under instantaneous deflections is presented. This chapter includes analysis of the available formula to calculate deflection to determine if these can be adopted for high strength concrete. Extensive ongoing research on the shear strength of beams by several researchers since many years has lead to the generation of a large body of knowledge. Although each author has analysed the data comparing them with existing relationships, the whole body of information has not been analysed to establish a statistical significance. In this study, regression analysis on experimental data collected from published research is carried a relationship between the different parameters affecting the shear strength of beams. The level of significance of the association between parameters influencing shear strength is also discussed.
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Fu, Hee Chaung. "Effects of high construction loads on the short term and long term deflections of slabs." Thesis, University of Ottawa (Canada), 1985. http://hdl.handle.net/10393/4681.

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Hossain, Tahsin Reza. "Numerical modelling of deflections of reinforced concrete flat slabs under service loads." Thesis, Imperial College London, 1999. http://hdl.handle.net/10044/1/7243.

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Browne, Keith R. J. "The instrumentation and initial analysis of the short-term control and stability derivatives of an ASK-I3 glider." Thesis, Stellenbosch : University of Stellenbosch, 2004. http://hdl.handle.net/10019.1/3631.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2004. 220 leaves single printed pages ,preliminary pages i-xiv and numberd pages 1-188.Includes bibliography.list of figures and used a Hp Scanjet 8250 Scanner to pdf format (OCR),
ENGLISH ABSTRACT: This thesis describes the process followed to determine the short-term control and stability derivatives of an ASK-13 glider (ZS-GHB). The short-term control and stability derivatives are obtained by parameter estimation done using data recorded in flight. The algorithm used is the MMLE3 implementation of a maximum likelihood estimator. To collect the flight data sensors were installed in the ZS-GHB. Sensors measuring the control surface deflections, translation acceleration, angular rates and the dynamic and static pressure are needed to provide enough data for the estimation. To estimate accurate derivatives specific manoeuvres were flown by the pilot, to ensure that all the modes of the glider were stimulated. The results reveal that the control and stability derivatives estimated from the flight data are not very accurate but are still suitable to be used in simulating the glider's motion.
AFRIKAANSE OPSOMMING: Hierdie tesis beskryf die proses wat gebruik is om die kort periode beheer en stabiliteit afgeleides van 'n ASK-13 sweeftuig vas te stel. Die kort periode beheer en stabiliteit afgeleides is verkry deur parameter afskatting op data wat gedurend vlugte van die sweeftuig opgeneem is. Die algoritme wat gebruik is om die parameters af te skat is die MMLE3 voorstelling van 'n maksimale moontlikheid afskatter. Om vlug data te versamel sensore moes in die sweeftuig geinstalleer word. Die sensore meet beheer oppervlak hoeke, versnellings, hoeksnellhede en die dinamies en statiese lugdruk om te verseker dat daar genoeg data is vir die afskatting. Om die afgeskatte parameters akkuraad te kry moet die loods spesefieke manoeuvres vlieg om seker te maak dat al die moduse van die sweeftuig is gestimuleer. Die resultate wat gelewer is 'n stel kort periode beheer en stabiliteit afgeleides wat nie akkuraad is nie, maar wat weI goed genoeg is or ie bewegings van die sweeftuig te simuleer.
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Singh, Mahendra. "Long term and short term deflection of GFRP prestressed concrete slabs." 2014. http://hdl.handle.net/1993/23654.

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This thesis investigates the performance of GFRP pretensioned concrete slabs and compares their flexural behaviour with GFRP reinforced and steel prestressed concrete slabs. A total of 12 slabs were cast in this program. The slab mid-span deflections are theoretically predicted and the results indicate that the short-term response of GFRP prestressed concrete slabs can be predicted well by the existing methods. Long-term deflection behaviour has been estimated using the Age Adjusted Effective Modulus Method by incorporating three creep and shrinkage models. A large influence of creep and shrinkage models on the theoretical determination is observed and the use of long term multipliers is not suitable for GFRP prestressed concrete members. The slabs were instrumented for long-term monitoring using strain gauges and fibre-optic sensors. It was concluded that the electrical strain gauges can be successfully used for long-term strain monitoring.
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Book chapters on the topic "Short-term deflection"

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Fargier-Gabaldon, Luis B., Mohamed Al-Tameemi, and Gustavo J. Parra-Montesinos. "Evaluation of Effective Moment of Inertia for Calculation of Short-Term Deflections of Steel Fiber Reinforced Concrete Flexural Members." In fib Bulletin 95. Fibre Reinforced Concrete: From Design to Structural Applications, 411–20. fib. The International Federation for Structural Concrete, 2020. http://dx.doi.org/10.35789/fib.bull.0095.ch42.

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Conference papers on the topic "Short-term deflection"

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Bouzid, Abdel-Hakim, and Samir Benabdallah. "On the Hot Blow-Out Characterization of PTFE-Based Gasket Materials." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97551.

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The objective of this work is to improve the HOt Blow-out Test procedure (HOBT) to determine the maximum operating temperature of Teflon-based gaskets. The study aims to analyze the relaxation of these gaskets due to creep at high temperature. The determination of their safe operating temperature limit requires a good knowledge of its capacity to resist creep-relaxation due to temperature exposure in the short and long term. This work investigates the effects cumulative gasket deformation due to thermal cycling, gasket stress level and holding time on the relaxation of these materials. In parallel, an experimental fixture has been developed to measure the thermal expansion coefficient and the short term creep resistance of such materials. Based on a previous work, the introduction of a fixed number of cycles of heating and cooling in the HOBT test procedure has shown that ratcheting damage may have some impact on reduction of the gasket stress and the temperature limit of PTFE. The effect of holding temperature for a short period of time will also be investigated. The modified HOBT rig allows measurement of the gasket deflection during the test in order to accurately quantify the cumulative permanent deformation. Several types of PTFE-based gaskets will be tested in order to cover a wide range of gaskets to justify the generalization of the modified procedure.
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Shamma, Mohamed, Stefan Raphael Harth, Nikolaos Zarzalis, Dimosthenis Trimis, Sven Hoffmann, Rainer Koch, Hans-Jörg Bauer, Leonardo Langone, Sofia Galeotti, and Antonio Andreini. "Investigation of Adjacent Lifted Flames Interaction in an Inline and Inclined Multi-Burner Arrangement." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59941.

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Abstract The main objective of this research is to assess an innovative, low nitrogen oxides emission combustor concept, which has the potential to achieve the long term European emissions goals for aircraft engines. Lean lifted spray flames and their very low nitrogen oxides emissions are combined with an inclination of burners in annular combustor leading to a more compact combustor with superior stability range. The presented combustor concept was developed in the frame of the European research project CHAIRLIFT (Compact Helical Arranged combustoRs with lean LIFTed flames). CHAIRLIFT combustor concept is based on “low swirl” lean lifted spray flames, which features a high degree of premixing and consequently significantly reduced nitrogen oxides emissions and flashback risk compared to conventional swirl stabilized flames. In the CHAIRLIFT combustor concept, the lifted flames are combined with Short Helical Combustors arrangement to attain stable combustion by tilting the axis of the flames relative to the axis of the turbine to enhance the interaction of adjacent flames in a circumferential direction. A series of experimental tests were conducted at a multi-burner array test rig consisting of up to five modular burners at different burner inclination angles (0° and 45°), equivalence ratios, and relative air pressure drop at ambient conditions. For all investigated configurations, a remarkable high lean blow out for non-piloted burners (ϕLBO = 0.29–0.37), was measured. The multi-burner configurations were observed having a superior stability range in contrast to the typical decrease in stability from single to high swirl multi-burner. The unwanted flow deflection of highly swirled flames in Short Helical Combustors arrangement, could be avoided with the investigated low swirl lifted flames. Moreover, the flame chemiluminescence (OH*) measurements were used to provide a qualitative characterization of the flame topology. Complementary numerical investigations were carried out using different numbers of burners to evaluate the effect of boundary conditions.
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Jones, Michael D., Kamran M. Nikbin, and Catrin M. Davies. "Load Line Displacement Partitioning in Creep Crack Growth Analyses of 316H Stainless Steel." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84303.

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Accelerated creep crack growth tests in the laboratory can lead to greater levels of plasticity at the tip of a creep crack than would be experienced in service. This is problematic when trying to determine C* which is used to model the stress field ahead of a crack. Deflection partitioning methods must be used in order to determine the contribution to the load line displacement rate as a result of creep which in turn is used to calculate C*. This partitioning can lead to negative values of the creep load line displacement rate due to the high contribution from plasticity. The amount of assumed plasticity is likely to be erroneously high as it is currently assumed that the material behaviour fits a Ramberg-Osgood model, when in reality such a fit does not predict the behaviour well over a large range of stress. This work compares the load line displacement determined from solutions based on a Ramberg-Osgood model with those calculated from finite element simulations using uniaxial tensile data to model the plasticity. The simulations formulated crack growth by means of a crack length vs time criterion using experimental crack growth data. It is found that the theoretical solutions do over predict the amount of plastic deformation compared to the numerical results. It is also found that for the short term test considered, the load-line displacement due to creep deformation was small compared to that from crack growth.
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