地震作用下高层钢筋混凝土结构倒塌数值模拟

Research of numerical simulation of collapse of high-rise structure subjected to earthquake

对地震作用下高层钢筋混凝土结构基于ABAQUS软件平台的倒塌数值模拟方法进行了介绍。采用有限单元法,通过材料层面的失效实现模拟构件损伤失效乃至整体结构的破坏倒塌。采用纤维梁单元模拟钢筋混凝土框架梁和柱,提出了一种新的纤维梁单元方向点计算方法,并给出了计算公式,基于VUMAT用户子程序实现梁单元材料积分点材料的失效用于模拟单元消失。采用壳单元模拟钢筋混凝土剪力墙和楼板,提出了壳单元消失的精确模拟方法,编制了能够用于实现壳单元材料积分点材料失效的子程序。考虑了倒塌过程中构件之间的接触。以某钢筋混凝土框架和框架-剪力墙结构为例,分别对其在强震作用下的破坏模式和倒塌过程进行了数值模拟,结果表明提出的仿真方法是可行的,对其他类型的结构倒塌数值模拟也具有一定的借鉴意义。

Numerical simulation method of collapse of high-rise reinforced concrete structure subjected to earthquake based on ABAQUS program was introduced. Using the finite element method,the failure on the material level was used to simulate the damage and failure of structural members as well as even collapse failure of the global structure. Reinforced concrete frame beams and columns were simulated by fiber beam elements. A new method about determination of orientation node of fiber beam element was proposed and calculation formula was provided. Element death was realized by the failure of integral point materials of beam element materials based on subroutine VUMAT. Reinforced concrete shear walls and slabs were simulated by shell elements. Element death of the shell element was implemented in terms of a new accurate simulation method,and the corresponding subroutine used to delete the failure of integral point materials of shell element was developed. Contacts of members in collapse process were also considered. Taking a RC frame and a frame-shear wall structure as example,failure mode and collapse process of the structures subjected to rare earthquakes were simulated respectively. The simulation results show that the proposed simulating method is practicable,and provides reference for numerical simulation of structure collapse for other structures.