多维地震作用下钢筋混凝土建筑结构的抗连续倒塌仿真分析

Simulation and Analysis of the Progressive Collapse of Reinforced Concrete Structures under Multidimensional Earthquakes

为了提高钢筋混凝土建筑结构的抗震性能,分析多维地震作用下钢筋混凝土建筑结构的抗连续倒塌能力,结合钢筋混凝土建筑结构特性、节点构造特点以及其在多维地震作用下的破坏机理,采用离散单元法建立结构连续倒塌的理论模型,对建筑结构连续倒塌过程进行数值模拟。基于数值模拟化结果,通过备用荷载路径法,实现建筑结构的抗连续倒塌分析。仿真实验结果得出,所提方法能实现对建筑结构抗连续倒塌的准确分析,且在多维地震作用下建筑结构扭转的幅度明显变大,结构顶层位移发散状态显著,不同楼层会产生不同的层间位移以及薄弱部位,建筑结构的抗连续倒塌性能随着失效构件位置的提升而增强。

This report establishes a theoretical model of the progressive collapse of reinforced con-crete(RC)structures with the discrete element method to improve the seismic performance of RC structures.In addition,this report analyzes the failure mechanism of RC structures subjected to multidimensional earthquakes and the progressive collapse-resisting capability of RC structures under multidimensional earthquakes based on the characteristics of RC buildings and structural joints.In addition9a numerical simulation of the progressive collapse process of the structure is performed.Based on the numerical simulation results?the alternate path method is used,and the anti progressive collapse analysis of the structure is performed.The simulation experimental re-sults show that the proposed method can accurately determine the progressive collapse-resisting capability of the structure.Under multidimensional earthquakes,the torsional amplitude of the building structure increases,and the divergent behavior of the top displacement is significant.There are different interstory drifts and weak sections at different stories,and the progressive collapse-resisting performance of the structure improves when the failed element is located at a higher level.