Study on Failure Modes of RC Columns Subjected to Dynamic and Cyclic Loading under Large Earthquake

1)通过系统的材料试验，研究了动荷载对混凝土力学性能及钢筋与混凝土粘结性能的影响。结合已有的试验结果，对混凝土和粘结的强度和破坏模式进行了讨论。建立了考虑动载和循环荷载作用下混凝土和粘结的动力有限元本构模型。2）为了了解大震作用下钢筋混凝土柱的破坏模式，对已有的剪切和弯曲破坏试件进行了动力有限元分析。通过与试验结果的对比分析，对恢复力特性、破坏模式和受剪承载力进行了详细的讨论。3）采用FEW非线性程序，考虑混凝土的循环荷载滞回效应，对钢筋混凝土墙板和剪力墙进行了分析。分析结果与试验结果吻合较好。

1) The systematic material tests were carried out in order to investigate the effects of dynamic loading on the mechanical properties of concrete, and bond between reinforcement and concrete. The strengths and failure modes of concrete and bond were discussed using the test results including the previous tests. Constitutive models considering the effects of dynamic and cyclic loading on concrete and bond were developed for dynamic FEM analysis.2) In order to understand the failure modes of reinforced concrete columns subjected to dynamic loading under large earthquake, previous test specimens with shear and flexural failure were analyzed by dynamic FEM analysis. Restoring force characteristics, failure modes and shear capacities obtained from analytical results were discussed compared with the test results in detail.3) The reinforced concrete panels and shear walls were analyzed by nonlinear FEW program considering the effects of cyclic loading hysteresis on concrete. The analytical results gave a good agreement with the experimental load-displacement relations.