大跨高位钢桁架转换层结构的实测与分析

浙江省电力调度大楼门厅采用大跨高位钢桁架转换层结构。为消除施工荷载及温度对钢桁架周边结构的影响,施工过程分两阶段进行:第一阶段大跨钢桁架端部混凝土未浇注,钢桁架支座处于可滑动铰支状态;第二阶段,待上部结构封顶后,再将钢桁架端部实行固支。对该钢桁架转换层第一阶段施工全过程的结构应力、位移进行现场试验研究,并将现场实测数据与缩尺模型试验结果进行对比。结果表明:第一施工阶段钢桁架挠度及应力实测值与模型试验值较接近,在温度和施工荷载作用下钢桁架端部产生了一定的水平位移,但其值远小于理想可动铰支模型的计算结果。

Field Measurement and Analysis of Long Span High-level Steel Truss Transfer Story Structure

High-level long span steel truss transfer story structure was adopted in the hall of Zhejiang electric power attempter building.To avoid the influence of constructing loads and temperature to the surrounding structure of the steel truss,the constructing process was divided into two stages.In the first stage,the concrete to the end of the transfer steel truss was not cast yet and the support of the truss can be referred to a moveable hinged support.After the upper stories were finished,the end of the steel truss was fixed.The stress and displacement of the first constructing stage are analyzed and compared with the model experimental results.It is shown that the test results of the deflection and the stress are close to the model experiment values.The temperature and the constructing loads from the upper stories may cause the horizontal displacement at the end of the steel truss,and the horizontal displacement is far less than the computed result of the moveable hinged support model.