Seismic collapse analysis of high‐rise reinforced concrete frames under long‐period ground motions
Seismic collapse analysis of high‐rise reinforced concrete frames under long‐period ground motions
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DOI：
10.1002/tal.1566
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
Yongtao Bai;Shaoyu Guan;Xuchuan Lin;Ben Mou
中科院分区：
文献类型：
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作者：
Yongtao Bai;Shaoyu Guan;Xuchuan Lin;Ben Mou
与纵向钢筋屈曲和混凝土压碎相关的结构损坏会导致钢筋混凝土 (RC) 梁和柱的强度和刚度下降。本文对典型高层 RC 建筑模型的地震引起的损坏和倒塌进行了数值研究，并考虑了强度退化（SD）效应。在具有广义应力纤维离散化的简单有限元分析程序中，滞后本构模型主要主导非弹性行为。纤维单元的应力-应变关系考虑了钢筋的屈曲和约束混凝土的破碎。当地震动强度超过设计水平时，小环向比构件中的SD效应往往会放大高层RC抗弯框架的地震反应。倒塌模拟时应充分考虑钢筋屈曲和混凝土破碎以及 P-Δ 效应。
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‐Δ effect for collapse simulations.