大跨度钢屋盖卸载过程力学模拟与分析  

Mechanics Simulation and Analysis of the Long-span Steel Roof during the Unloading Process

作　　者：郑江[1] 郝际平[1] 王宇 李宁 魏尚起 徐重良 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]中国二十冶集团有限公司,上海201900 [3]中建钢构有限公司,广东深圳518040

出　　处：《建筑科学》2014年第3期80-84,112,共6页Building Science

基　　金：教育部高等学校博士学科点专项科研基金新教师类(20126120120010);中冶重大科技专项"冶金工程模块化建造技术"资助

摘　　要：深圳大运会主体育馆钢屋盖采用单层折面空间网格体系,空间形体复杂,结构杆件的空间定位控制精度要求高,安装难度大。为了提高这种空间结构施工成形的安装精度,采用对安装位形较易控制的施工方法——多点胎架支撑高空散装法。屋盖主体结构合拢安装完毕后进行胎架卸载,这个过程是胎架逐步退出工作,主体结构逐步承担荷载的转换过程。不同的卸载方式会对胎架及主体结构受力过程产生不同的影响,需在结构设计和施工中加以考虑。对大运会主体育馆钢屋盖建立有限元模型,采用温控千斤顶单元法进行卸载阶段的力学模拟和分析;跟踪卸载过程中结构及胎架的内力和变形的发展过程,并和实测结果进行比较,为设计和施工提供理论依据。The steel roof of main palaestra of the World University Games is a long span space structure of single- layer fold face reticulated shells. The space positioning installation of members of this structure is very difficuh, and the control accuracy is very high. In order to improving the installation accuracy of the space structure during the construction, a method named bulk-way assembly technology at high altitude with multi-points supporting is adopted. After the closure of the steel roof structure, the temporary supporting jigs begin to be unloaded. During this process the supporting jigs quit work gradually and the main structure begins to carry the load. Different unloading way will make different influence for the main structure and supporting jigs during the unloading process, it should be considered in the structural design and construction stage. In this paper, FEA method is adopted to analyze the unloading procedures according to the real construction process in order to finding the actual internal force and deformation. The results can provide references for the design and construction.

关 键 词：大跨度 钢屋盖 卸载过程 力学模拟 变形 

分 类 号：TU391[建筑科学—结构工程]