基于多重响应的大跨度空间网格结构重要构件评估方法

为统一大跨度空间网格结构在进行连续性倒塌分析时移除构件的判别方法.基于稳定与强度失效模式,给出大跨度空间网格结构重要构件初选范围的选取方法.在此基础上提出了基于初选范围的多重响应分析法,并将该方法通过算例进行验证后应用于世界大学生运动会主体育场中,得到此类折面空间网格结构的重要构件分布.该分析结果与实际工程的设计结果吻合较好.研究表明:基于初选范围的多重响应分析法简单实用,能够快速全面地评估大跨度空间网格结构中构件的重要性,弥补了现有方法只考虑单一结构响应的不足,解决了目前连续性倒塌分析中初始失效构件判别没有统一标准的缺陷,使备用荷载路径法得到了更广泛的应用.

Evaluation Method for Important Members of Large-span Spatial Grid Structures Based on Multiple Responses

In order to unify the discrimination method of failure members in progressive collapse analysis for large-span spatial grid structures, the selection method of probable range for the important members was put forward based on the failure modes of buckling and strength. A novel analytical method, known as multiple responses, was then introduced based on the primary scope. This proposed method was eventually implemented in the mechanical analysis of the main stadium for the Universiade Sports Centre. The arrangement of the important members for folded-plane latticed shell structures was established. It is found that the computation results agree with the design results well. It is shown that the novel analysis approach is suitable for the evaluation of the structural performance of the important members in large-span spatial grid structures. The deficiency of current methods that single structural response is only considered is made up. The problem that the unified standard is not given for the members to be removed of spatial grid structures in progressive collapse analysis is also solved. Moreover, the alternate load path method will have extensive applications.