【摘要】 基于ABAQUS对钢筋混凝土框架结构在强震作用下的连续倒塌数值模拟方法进行研究。采用纤维梁单元模拟框架梁和柱,采用壳单元模拟钢筋混凝土楼板。编制可用于模拟纤维梁单元的混凝土和钢筋及楼板钢筋的动力单轴本构用户子程序,并基于子程序实现单元积分点材料的失效用于模拟单元生死。基于混凝土弹塑性损伤本构近似模拟钢筋混凝土楼板的刚度削弱及失效,并采用单元接触考虑倒塌过程中单元之间的碰撞和结构碎片堆积情况。数值算例结果表明,编制的用户子程序是正确的,较好地实现了材料失效及单元生死模拟,采用的方法可以较好实现钢筋混凝土框架结构在地震作用下的连续倒塌仿真计算。更多还原

【Abstract】 Progressive-collapse simulation method of reinforced concrete frame structure subjected to earthquake is studied on the basis of ABAQUS. Beams and columns of frame structure are modeled by fiber beam elements, and reinforced concrete slab is simulated by shell element. Uniaxial constitutive models of concrete and steel rebar are incorporated into user subroutines, which are used to simulate the concrete and steel rebar of fiber beam element, and the steel rebar of reinforced concrete slab. Element death and birth are realized by the failure of material points that satisfy a user-defined failure criterion can be deleted from the model. Stiffness degradation and failure of reinforced concrete slab are completed through the concrete damaged plasticity model. Element contact is also considered to simulate collision and structure fragments accumulation. Then, take a frame structure as an example, analysis results show that the user subroutines are correct and can be applied to model material failure and element death. The proposed method can be used to simulate the progressivecollapse of reinforced concrete frame structure under rare seismic.更多还原