砌体结构倒塌全过程的颗粒流数值模拟  

Numerical Simulation of Particle Flow for the Whole Process of Masonry Structure Collapse

作　　者：许以柔 白羽[2] Xu Yirou;Bai Yu(College of Public Safety and Emergency Management,Kunming University of Science and Technology,Kunming 650031,China;College of Civil Engineering,Kunming University of Science and Technology,Kunming 650031,China)

机构地区：[1]昆明理工大学公共安全与应急管理学院,昆明650031 [2]昆明理工大学土木工程学院,昆明650031

出　　处：《科技通报》2023年第6期78-83,共6页Bulletin of Science and Technology

基　　金：云南省科技厅重点研发计划项目(202003AC100001)。

摘　　要：为研究砌体结构在地震作用下的倒塌机理,本文通过PFC2D(Particle Flow Code,PFC)颗粒流软件建立一个三层两跨砌体模型,输入地面震动波,模拟砌体结构在地震作用下的倒塌。结果表明:通过设置合理的模型参数,使用PFC2D软件可以较好地模拟砌体倒塌的全过程。通过对模型的裂纹分布、应力应变及位移等进行分析,较好地反映出砌体结构在地震作用下构件开裂、失效、局部倒塌到整体倒塌的全过程。可以定性了解砌体结构在强震作用下的薄弱部位:边缘墙破坏更严重,底层墙体比上层严重,砌体房屋门窗洞口四角处更易发生破坏。PFC2D颗粒流软件有计算速度快和易实现大规模计算的优点,应用范围广泛。使用该软件并将其应用于建筑物的动态灾变过程研究,能够找出结构的易损部位,方便设计人员采取针对性措施来提高其抗震性能,也能为多层砌体结构建筑的抗震加固提供依据。In order to study the collapse mechanism of masonry structure under earthquake,a three-story two-span masonry model was established by PFC2D particle flow software,and ground vibration waves were input to simulate the collapse of masonry structure under earthquake action.The results show that by setting reasonable model parameters,the whole process of masonry collapse can be better simulated by using PFC2D software.By analyzing the crack distribution,stress-strain and displacement of the model,the whole process of masonry structure cracking,failure,local collapse and overall collapse under earthquake is well reflected.PFC2D particle flow software has the advantages of fast calculation speed and easy to realize large-scale calculation,and is widely used.Using this software and applying it to the study of dynamic disaster processes in buildings,we can find out the vulnerable parts of the structure and facilitate designers to take targeted measures to improve its seismic performance,and also provide a basis for the seismic strengthening of multi-story masonry buildings.

关 键 词：砌体结构 倒塌过程 数值模拟 PFC2D颗粒流软件 

分 类 号：TU364[建筑科学—结构工程]