广州会展中心屋顶张弦桁架几何变形监测

广州会展中心屋顶采用的大跨度预应力张弦桁架是一种新型结构．为了解该张弦桁架在不同施工阶段的实际变形情况，在现场利用现代大地测量仪器和技术对张弦桁架进行了几何变形监测，得到了张弦桁架在不同施工阶段的变形特性和参数．结果表明，张弦桁架的位移主要表现在Z方向，桁架中间位置的观测点变形量最大，在张拉阶段张弦桁架变形的实测值大于理论计算值．

Geometric Deformation Monitoring of the Roof Truss- string Applied to Guangzhou International Conference Exhibition Center

The large-span prestressing truss-string applied to Guangzhou International Co nference Exhibition Center is a new-type structure. In this paper, modern geode tic instruments and technologies were used to monitor the geometric deformation on the spot, with the aim of investigating the real deformation of the truss-st ring in different construction periods. Deformation parameters and characteristi cs of the truss-string in different construction periods were then obtained. Th e results indicate that the displacement of the truss-string mostly happens in Z direction, and the deformation at the middle observation point is the bigg est. It is also indicated that, in the tension period, the actual deformation pr oves bigger than the theoretical calculation.