田黎敏+魏建鹏+郝际平+王先铁

摘要：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.基于穩定与强度失效模式，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.

关键词：大跨度空间网格结构；连续性倒塌；重要构件；初选范围；多重响应

中图分类号：TU393.3 文献标识码：AEvaluation Method for Important Members of Largespan

（School of Civil Engineering， Xian Univ of Architecture and Technology， Xian， Shaanxi710055， China）Abstract：In order to unify the discrimination method of failure members in progressive collapse analysis for largespan 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 foldedplane 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 largespan 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.

Key words：largespan spatial grid structure； progressive collapse； important member； primary scope； multiple responses

结构连续性倒塌的研究始于1968年英国Ronan Point公寓燃气爆炸事故，自开始以来，经历了3个高峰期，且每个高峰期都伴随着标志性的倒塌事故，其中最广为人知的是2001年美国纽约世贸中心的恐怖袭击事件.研究进行以来，取得了不少有价值的研究成果，并编制了相关的设计规程[1-3].

迄今为止，国内外的研究成果主要集中在框架结构体系，而针对大跨度空间结构倒塌问题的研究则相对较少.究其原因，一方面是因为连续性倒塌的事故多来源于框架结构；……