提前卸载临时支撑对大跨度空间结构施工过程的影响分析  

Analysis on the Effect of Unloading Temporary Supports in Advance on Construction for Large-Span Spatial Structures

作　　者：田黎敏[1] 郝际平[1] 方敏勇[2] 王先铁[1] 郑江[1] 钟炜辉[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]安徽富煌钢构股份有限公司,安徽巢湖238076

出　　处：《建筑钢结构进展》2013年第2期52-56,共5页Progress in Steel Building Structures

基　　金：国家自然科学基金(51178381);高等学校博士学科点专项科研基金(20096120110004)

摘　　要：设置临时支撑几乎是所有大跨度空间钢结构施工过程中必然要遇到的问题。由于临时支撑的存在,改善了结构的受力性能,使结构更加安全,但是辅助用钢量也会增加较多。在符合受力的前提下,如何实现建造过程中安全和经济的平衡是施工研究的关键。以世界大学生运动会主体育场实际工程为例,对结构进行临时支撑提前卸载分析,并将计算结果同未提前卸载的分析结果进行比较,给出了结构内力和变形的变化趋势,提出了有针对性的改进意见。分析计算结果表明:直接循环卸载方案不安全因素较大,而考虑关键位置修正的循环卸载方案可以运用于大跨度空间结构的施工中,为大跨度空间结构合理施工提供参考。It is inevitable to set up temporary supports in the construction of almost all the large-span spatial structures,since temporary supports can improve the mechanical behavior of the structure.However,the auxiliary steel consumption is also increased.For this reason,it is pivotal to realize the balance between safety and economy according to stress conditions.Analysis on unloading the temporary supports of main stadium for the Universidad Sports Centre in advance is discussed in the paper.The results from unloading in advance and normal unloading are compared.On this basis,the paper also gives some suggestions and comments about construction.The results show that unsafe factor of cyclic unloading is large.It is feasible to consider correction of cyclic unloading at key positions during construction.These results provide a reasonable basis for the construction.

关 键 词：提前卸载 临时支撑 大跨度空间结构 有限元分析 

分 类 号：TU393.3[建筑科学—结构工程] TU745.2