摘要
基于ABAQUS对采用不同钢筋和混凝土单轴本构模型的钢筋混凝土框架结构在大震作用下的连续倒塌数值模拟进行了比较研究。采用纤维梁单元模拟框架梁和柱,壳单元模拟钢筋混凝土楼板。分别编制了两种可用于模拟纤维梁单元失效的混凝土和钢筋单轴本构的用户子程序,考虑了钢筋混凝土楼板的刚度削弱、单元失效与接触。对某钢筋混凝土框架结构采用4组不同本构关系的计算结果进行了详细比较,结果表明不同材料模型得到的倒塌初始状态及初步发展趋势是一致的。
Using different uniaxial constitutive models of rebar and concrete, a comparative research on progressive collapse simulation of reinforced concrete frame structure subjected to the rare earthquake was carried out on the basis of ABAQUS software. Beams and columns of frame structure were modeled by fiber beam element, and reinforced concrete slab was simulated by shell element. Two uniaxial constitutive models of concrete and rebar were incorporated into user subroutines respectively, which were used to simulate the death and birth of the fiber beam element. Stiffness degradation, element failure and contact were also considered for reinforced concrete slab. Take a reinforced concrete frame structure as example, analysis results by means of four different constitutive relationships were compared in detail. The comparative results show that initial collapse state and initial development trend from different material models are consistent.
出处
《建筑结构》
CSCD
北大核心
2014年第14期81-85,55,共6页
Building Structure
关键词
框架结构
连续倒塌
地震作用
数值模拟
frame structure
progressive collapse
earthquake action
numerical simulation
