地震序列作用下砌体结构弹塑性动力破坏倒塌情景仿真

项目名称： 地震序列作用下砌体结构弹塑性动力破坏倒塌情景仿真

项目编号： No.51508535

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑环境与结构工程学科

项目作者： 陈浩

作者单位： 中国地震局工程力学研究所

项目金额： 20万元

中文摘要： 世界多数抗震规范主要考虑单次地震作用下的结构设计，未考虑多次地震动影响。强余震常有发生，而结构在多次与单次地震动作用下的破坏状态不同。余震有时成为其倒塌的关键因素。砌体结构或将成为我国乡镇抗震能力提升的主体结构之一，世界上有广泛分布。研究地震序列作用下砌体结构开裂失效和倒塌机制，在抗震规范中如何考虑地震序列的影响具有重要意义。.结构在多次地震动作用下发生损伤累计，开裂后刚度发生突变，内力重分布，采用传统方法不足以反映其失效过程和破坏机制。本研究以三维断裂有限元方法（PDS-FEM）为基础，创建一个集砌体结构快速建模，弹塑性动力求解，破坏倒塌分析和情景再现技术于一身的分析平台。引入并行计算技术大幅提高计算效率。根据我国国情研究地震序列设定方法。以此为基础研究多次地震动作用下砌体结构破坏倒塌机理，为抗震规范中如何考虑多次地震动影响提供研究方法和理论依据。

中文关键词： 地震序列；砌体结构；断裂力学；弹塑性动力分析；并行计算

英文摘要： Most worldwide seismic codes consider structure design only subjected to single seismic wave. The effects of earthquake sequences have not been considerated carefully. However, multiple earthquakes occur within short time period are always observed in history events, and the structures behave quite differently under single or multiple earthquakes. Sometimes, aftershock becomes the key element for structure collapse. Meanwhile, masonry is one of the most popular structure types in the world. Also, it will become one of the major structure types for aseismic capacity promotion in Chinese rural areas. In order to prevent disastrous collapse of masonry structures under earthquake sequences, it is significant to study the crack growth and collapse mechanics by using numerical simulation and experiments, simultaneously. The effect of earthquake sequences should be evaluated and taken into consideration in seismic codes..It might be insufficient to study collapse mechanics by using traditional macro analysis methods, push-over or seismic fragility without fracture analysis, since stiffness matrix and strain energy will change drastically due to crack growth,also the damage accumulates among earthquake sequences. Based on PDS-FEM (Particle Discretization Scheme Finite Element Method, a three dimensional fracture analysis method), this project will create a platform by developing fast modeling technology for masonry structure, fracture/collapse analysis method, and the eartuquake senario visualization technologies.In order to apply this platform to real structures, parallel computing technology will be applied, and the computation efficiency will be highly advanced. After setting up the platform, a study of a masonry structure under earthquake sequences will be conducted. The findings of this project will be useful to understand the collapse mechanics of masonry structures. Also, it will provide a new viewpoint to understand the efect of multiple earthquakes and how to consider the effect of earthquake sequences in seismic design.

英文关键词： Earthquake sequences;Masonry structure;Fracture mechanics;Elasto-plastic dynamic simulation;parallel computation