大跨空间结构重要构件评估实用方法  

Practical Method for the Evaluation of Important Structural Components of Long-span Space Structures

作　　者：蔡建国[1] 王蜂岚[1] 韩运龙[1] 冯健[1] 张晋[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室江苏省预应力工程技术研究中心,江苏南京210096

出　　处：《湖南大学学报（自然科学版）》2011年第3期7-11,共5页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50478075);江苏省六大人才高峰资助项目(07-F-008);江苏省自然科学基金资助项目(BK2006104);东南大学优秀博士学位论文基金资助项目(YBJJ0817)

摘　　要：为了利用改变路径法(AP法)进行大跨空间结构的连续倒塌分析,给出了AP法中移除构件判断的实用方法.该方法的主要思想是首先通过一定的概念判断,初步确定结构重要构件的选择范围.然后对初选的重要构件依据简化的敏感性计算方法考虑包括杆件的移除、杆件截面的削弱、拉索预应力的降低等因素对荷载作用下结构响应的影响,求解其重要性系数,确定结构的重要构件.最后利用本文方法对网架结构以及索拱结构两个算例进行了分析,计算结果表明:本文所给出的方法能够有效地作为大跨空间结构的重要构件的评估方法.该方法解决了现行抗连续性倒塌设计规范中没有明确规定非框架结构移除构件的缺陷,使AP法得到更广泛的应用.In order to discuss the progressive collapse of long-span space structures with the alternate path method（AP method）,a practical method for the evaluation of elements to be removed was presented.The elementary scope of important elements was selected through concept analysis,and then the importance coefficient of these elements was calculated through simplified sensitivity analysis to choose the important elements.The effects of the removal of elements,the variation of cross-section of elements and the change of pre-stress of cables on the structural response were considered in the sensitivity analysis.A space grid structure and a cable-arch structure were analyzed in this method.The results have shown that the method is suitable for the evaluation of important structural components of long-span space structures.The problem that the elements to be removed for other non-frame structures are not given in codes has been solved,and then the AP method will have extensive applications.

关 键 词：敏感性分析 杆件重要性 概念分析 变换荷载路径法 

分 类 号：TU312.3[建筑科学—结构工程] TU31