基于精细化计算模型的网壳结构性能评价方法及动力破坏模式研究

项目名称： 基于精细化计算模型的网壳结构性能评价方法及动力破坏模式研究

项目编号： No.51508557

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑科学

项目作者： 齐麟

作者单位： 中国民航大学

项目金额： 20万元

中文摘要： 基于精细化的计算模型深入研究网壳结构在地震作用下的性能评价方法与动力破坏模式，是完善网壳结构抗震设计方法的基础。针对目前网壳结构动力计算方法中存在的问题，拟采用试验分析、理论研究与数值模拟相结合的方法，建立考虑二阶效应、材料非线性、失稳及三者耦合效应的网壳结构杆件精细化计算模型；建立考虑抗弯刚度与破坏过程的网壳结构典型节点精细化计算模型。基于精细化的网壳结构计算模型，结合设计规范对网壳结构强度、稳定性与变形的规定，确定构件性能状态同结构性能状态之间的关系，建立适用于网壳结构的性能评价方法。建立基于性能的、实用的网壳结构动力破坏准则。基于精细化的计算模型与动力破坏准则，采用参数化分析方法，考虑杆件失稳、塑性铰分布与节点破坏对结构动力破坏的影响，研究不同形式的网壳结构在地震作用下的动力破坏模式，为完善网壳结构的抗震设计方法提供理论依据。

中文关键词： 网壳结构；精细化模型；性能评价；动力破坏准则；动力破坏模式

英文摘要： Deep research on performance estimation and dynamic failure mode of lattice shells under earthquake based on the refined calculation model is the foundation of perfect seismic design method for this type of structure. To improve and perfect the current numerical calculation for lattice shells, the experimental analysis, numerical simulation and theoretical study are all used to establish a refined member calculation model considering the second order, the material nonlinearity, the member buckling and the coupling effect of all above, and a refined calculation model for classic joints of lattice shells considering both the moment stiffness and the damage progress. Based on the refined calculation model and the relationship between the member performance and structure performance, the performance estimate method for lattice shell is prepared to found with the consideration of the limits of structural strength, stability and deformation given in the design codes. Performance based failure criterion for lattice shells is also prepared to found. Based on the refined calculation model, the dynamic failure modes of lattice shells of different types considering member buckling, plastic hinge distribution and joint damage will be studied by parameter analyses. Achievements of this research will provide reliable theoretical evidence for the perfection of the seismic design method of lattice shells.

英文关键词： lattice shell;refined model;performance estimation;dynamic damage criterion;dynamic damage mode