空间结构悬臂法施工双向坐标修正法分析研究

Analysis and research on two-way coordinate correction method for cantilever construction of space structure

针对空间结构悬臂法施工过程中变形累积导致合拢位形与设计位形差异较大的问题,对一简化的平面弧形杆系结构,分别采用正向切线定位法和正向坐标定位法对结构安装坐标进行修正,指出两种方法的不足,并提出跟踪定位法对结构安装坐标进行修正.进一步采用逆向修正法,按与正向施工相反的顺序逐步拆除各施工步构件,并根据各施工步变形来修正结构安装坐标.两种方法均能实现结构合拢位形与设计位形一致.推荐逆向修正法作为空间结构悬臂法的施工位形确定方法.

In order to solve the problem of the large difference between the closure shape and the design shape caused by the accumulation of deformation during the cantilever construction of space structure,the forward tangent location method and the forward coordinate location method are used to modify the installation coordinates of a simplified plane arc-shaped bar structure,respectively.The shortcomings of the two methods are pointed out,and the tracking location method is creatively proposed to modify the installation coordinates of the structure.The reverse correction method is further adopted.The components are gradually removed in the reverse order of the forward construction,and the installation coordinates of the structure are modified according to the deformation of each construction step.Both methods can achieve the consistency of structural closure configuration and design configuration.The reverse correction method is recommended to determine the construction configuration of cantilever method for space structures.