Analysis and Field Monitoring of the Influence of Temperature on the Lifting Process of Complex Long-Span Gymnasium Steel Structures
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摘要: 为了研究高温环境对复杂大跨空间结构吊装施工过程的影响,以民勤县体育中心连体钢结构屋盖为工程背景,针对双层网壳吊装施工全过程进行数值模拟与监测。探讨了温度对结构在起吊阶段以及胎架支承阶段应力及变形的影响规律。数值模拟计算值与监测值的对比分析,验证了所考虑温度影响的数值模拟方法的合理性,同时基于增大荷载效应的方法考虑局部杆件实测应力增大的影响,提出了不考虑温度与考虑温度两种情况下的数值模拟荷载效应增大系数的取值。Abstract: In order to study the influence of high temperature environment on the lifting process of complex long-span space structures, the connecting steel roof of Minqin County Sports Center was used as the engineering background. The whole process of lifting construction of a double-layer reticulated shell was simulated and monitored. The influence of temperature on the stress and deformation of the structure during lifting and supporting of the frame was discussed. The comparison between the calculated values and the monitored values verified the rationality of the numerical simulation method considering the influence of temperature. At the same time, based on the method of increasing the load effect and considering the effect of increased measured stress on local members, the values of the increase coefficient of the load effect in numerical simulation with and without considering temperature effect were presented.
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