CCTV新台址主楼施工过程结构内力和变形分析

ANALYSIS OF INTERNAL FORCE AND DEFORMATION FOR THE NEW CCTV HEADQUARTERS DURING THE CONSTRUCTION PROCESS

CCTV新台址主楼具有"塔楼倾斜"、"空间连体"及"大悬臂"的构成特点。施工过程中"路径"效应对建造过程中以及竣工时结构内力和变形的影响较大,与一次成型下的分析结果存在较大差别,需在结构设计中加以考虑。同时需采取合理的施工方法和措施,以保证施工过程中结构的安全性以及竣工时结构的内力和变形满足设计要求。为此,建立CCTV新台址主楼施工过程分析的有限元模型,对其进行施工全过程跟踪模拟分析,给出施工过程结构的内力发展和变形变化的过程,供设计和施工参考。

The new CCTV headquarters consists of two towers leaning 6° off vertical in both directions, a tremendous 14- story-high cantilever joining two leaning towers at the top and a 9-story-high podium at the bottom. Different construction procedures will lead to different internal force and deformation distribution during the construction process in this complex steel structure. They will be locked within the structure and have to be considered in the structural design. It is evident that there is a great difference in internal force and deformation distribution between according to design model one time loading and according to step-by-step construction process. And it is necessary to take reasonable construction procedures and measures to guarantee the internal force and deformation of the construction-completed structure to meet the requirement given by designers. It is presented the internal force and deformation analysis of the CCTV new headquarters during the construction process by employing nonlinear finite element method, and the internal force and deformation distribution locked in the structure is determined. Lots of numerical results have been obtained as guidelines for the erection and construction of the project.