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Seismic collapse analysis of high-rise reinforced concrete frames under long-period ground motions

机译：高层钢筋混凝土框架在长期地震作用下的地震倒塌分析

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摘要

Structural damages associated with buckling of longitudinal reinforcing steel and crushing of concrete induce strength and stiffness degradation in reinforced concrete (RC) beams and columns. This paper presents a numerical investigation on earthquake-induced damages and collapse of typical high-rise RC buildings model incorporating strength degradation (SD) effects. In a simple finite-element analysis program with the generalized stress fiber discretization, hysteretic constitutive models primarily dominate the inelastic behavior. Buckling of reinforcing steel and crushing of confined concrete are taken into accounted to the stress-strain relationship of fiber elements. The SD effect in components with small hoop ratio tends to amplify the seismic responses high-rise RC moment-resisting frames when the intensity of ground motions exceeds the design level. Buckling of steel rebar and crushing of concrete should be fully considered together with the P-Delta effect for collapse simulations.
机译：与纵向钢筋屈曲和混凝土碾压相关的结构损伤会导致钢筋混凝土（RC）梁和柱的强度和刚度降低。本文对包含强度退化（SD）效应的典型高层RC建筑物模型的地震破坏和倒塌进行了数值研究。在带有广义应力纤维离散的简单有限元分析程序中，滞后本构模型主要控制非弹性行为。考虑到纤维元件的应力-应变关系，考虑到了钢筋的屈曲和密闭混凝土的压碎。当地面运动的强度超过设计水平时，具有较小箍比的构件中的SD效应往往会放大高层RC抗震框架的地震响应。对于倒塌模拟，应充分考虑钢筋的屈曲和混凝土的破碎以及P-Delta效应。

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