空间网格结构强震损伤演化机理和抗震性能评估关键问题研究

项目名称： 空间网格结构强震损伤演化机理和抗震性能评估关键问题研究

项目编号： No.51308513

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 聂桂波

作者单位： 中国地震局工程力学研究所

项目金额： 25万元

中文摘要： 本项目在空间网格结构强震失效机理研究的基础上，考虑可靠度理论和性能化的抗震设计思想，研究结构损伤演化机理和抗震性能评估领域的几项关键问题：（1）通过试验研究空间网格结构常用杆件Q345钢管的空间滞回特性，基于ABAQUS开发能够考虑材料损伤累积的子程序，建立通用的钢材考虑损伤累积的本构模型；（2）基于损伤累积的本构模型和动力增量全过程分析方法（IDA）开展空间网格结构强震失效机理参数分析，考察结构的强震响应；（3）建立地震动数据库，通过多组地震动IDA分析结果的拟合，建立结构的地震损伤模型，定量化评估结构损伤程度；（4）提出空间网格结构的多级性能水准和多级性能目标，引入结构可靠度理论，开展结构地震易损性分析和地震危险性分析，评估结构完成抗震性能目标的能力。本项目以实用化为研究目标，所取得的成果将为空间网格结构的抗震设计提供有力支持。

中文关键词： 空间网格结构；材料损伤累积；本构模型；振动台试验；数值分析

英文摘要： Based on failure mechanism for spatial lattice structures subjected to severe earthquakes, reliability theory and performance-based seismic design theory,the project focuses on several key issues on mechanism of damage evolution and seismic performance evaluation of spatial lattice structures. The research contents include: (1) to obtain a generalized constitutive model considering material damage accumulation, conduct a test of circular steel specimens to investigate their hysteretic behavior, and develop the finite element model using a user defined material sub-routine UMAT incorporating ABAQUS to consider material damage accumulation; (2) to study the responses regularity of spatial lattice structures subjected to seismic load, conduct the vast scale parametric analysis of the failure mechanism of spatial lattice structures by whole-course analysis method using the refined material constitutive model; (3) to assess structural damage levels quantitative, establish structural seismic damage models based on multiple groups of IDA analysis results; (4) to carry out the seismic performance evaluation of spatial lattice structures, the structural performance levels and performance objectives is defined, then conduct seismic hazard and seismic fragility analysis based on the structural reliability theory.The resear

英文关键词： Space lattice structure；Material damage accumulation；Constitutive model；Shaking table test；Numerical simulation