Time-Dependent Post-Peak Softening of RC Members in Flexure
Source abstract
Abstract
To investigate the rate effects on post-peak structural behavior accompanying the compression softening of structural concrete, experimental studies were carried out on over-reinforced concrete beams with and without confinement under varied rates of flexural loading. The effects of loading rate on the capacity and ductility of RC beams were found more pronounced in confined cases than unconfined cases. The generic time-dependent constitutive model of compression-softened concrete was applied to nonlinear collapse analysis and its applicability was verified by experiments. The strain rate in the compressive localized zone in structures rapidly increased after the member reached its peak capacity even though the rate of displacement was kept unchanged especially in the case of unconfined beams. In the case of confined RC beams, localization of weak strain occurred but with comparatively greater time-dependent plasticity and fracturing within the structure. These deformation characteristics were adequately simulated by nonlinear analysis using a time-dependent constitutive model for softened concrete in compression.
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Research context
OpenAlex topics: Structural Response to Dynamic Loads · High-Velocity Impact and Material Behavior · Structural Behavior of Reinforced Concrete
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Civil Engineering, The University of Tokyo
References (17)
Show source-provided references
1. Alca, N., Alexander, S. D. B. and MacGregor, J. G. (1997). “Effect of size on flexural behavior of high strength concrete beams.” ACI Structural Journal, 94(1), 59-67.
2. An, X., Maekawa, K. and Okamura, H. (1997). “Numerical simulation of size effect in shear strength of RC beams.” Journal of Materials, Concrete Structures and Pavement, JSCE, V-35(564), 297-316.
3. Cervenka, V. and Cervenka, J. “Computer simulation as a design tools for concrete structures.” ICCE-96, Bahrain.
4. Dhakal, R. P. and Maekawa, K. (2002). “Modeling for post-yield buckling of reinforcement bar including buckling.” Journal of Structural Engineering, ASCE, 128(9), 1139-1147.10.1061/(ASCE)0733-9445(2002)128:9(1139) ↗
5. El-Kashif, K. F. and Maekawa, K. (2004). “Time-dependent nonlinearity of compression softening in concrete.” Journal of Advanced Concrete Technology, Japan Concrete Institute, 2(2), 233-247.10.3151/jact.2.233 ↗
6. El-Kashif, K. F. and Maekawa, K. (2003). “Computational model for time-dependent compressive behavior based on plasticity and fracturing approach.” JCI Proceedings, 25(2), 145-150.
7. El-Kashif, K. F. and Maekawa, K. (2003). “Time-dependent compressive deformation and post-peak softening for concrete.” Toronto, Conference on Response of Structures to Extreme Loading.
8. Jansen, D. C., Shah, S. P. and Rossow, E. C. (1995). “Stress-strain results of concrete from circumferential strain feedback control testing.” ACI Material Journal, 92(4), 419-428.
9. Jansen, D. and Shah. S. P. (1997). “Effect of length on compressive strain softening of concrete.” Journal of Engineering Mechanics, ASCE, 123(1), 25-35.10.1061/(ASCE)0733-9399(1997)123:1(25) ↗
10. Lettsrisakulrat, T., Watanabe, K., Matsuo, M. and Niwa, J. (2000). “Localization effects and fracture mechanism of concrete in compression.” JCI Proceedings, 22(3), 145-150.
11. Maekawa, K. and El-Kashif, K. F. (2004). “Cyclic cumulative damaging of reinforced concrete in post-peak regions.” Journal of Advanced Concrete Technology, Japan Concrete Institute, 2(2), 257-271.10.3151/jact.2.257 ↗
12. Maekawa, K, Pimanmas, A. and Okamura, H. (2003). “Nonlinear Mechanics of Reinforced Concrete.” SPON Press, London.
13. Nakamura, H. and Higai, T. (1999). “Compressive fracture energy and fracture zone length of concrete.” Seminar on Post-peak Behavior of RC Structures Subjected to Seismic Loads, Japan Concrete Institute, C51E(2), 259-272.
14. Okamura, H. and Maekawa, K. (1991). “Nonlinear Analysis and Constitutive Model of Reinforced Concrete.” Giho-do Press, Tokyo.
15. Pallewatta, T. M., Irawan, P. and Maekawa, K. (1995). “Effectiveness of laterally arranged reinforcement on the confinement of core concrete.” Proc. of JSCE, V-28(520), 297-308.
16. Van Mier, J. G. M. (1986). “Multiaxial strain-softening of concrete, Part I: Fracture.” Material and structures, RILEM, 19(111), 179-190.10.1007/BF02472034 ↗
17. Weiss, J., Kadir, G. and Shah, S. P. (2001). “Localization and size-dependent response of reinforced concrete beams.” ACI Structural Journal, 98(5), 686-695.