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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。
The collapse numerical simulation method of high-rise reinforced concrete structures under the earthquake is introduced based on ABAQUS software platform. Finite element method is adopted to achieve the failure failure of the simulation component and the collapse of the overall structure through the failure of the material layer. A new method to calculate the directional points of fiber beam elements is proposed by using fiber beam elements to simulate reinforced concrete frame beams and columns. The calculation formula is given. Based on the VUMAT user subroutine, the failure of material points of beam elements is used to disappear the simulation elements . Using shell elements to simulate reinforced concrete shear walls and slabs, an accurate simulation method for the disappearance of shell elements was proposed, and a subroutine that could be used to realize the failure of material points at shell elements was developed. Consider the contact between the components during the collapse. Taking a reinforced concrete frame and frame-shear wall structure as examples, the failure modes and collapsing processes under strong earthquakes are numerically simulated. The results show that the proposed simulation method is feasible and the collapse of other types of structures Numerical simulation also has some referential significance.