温度变化对CCTV新台址主楼大悬臂合拢的影响  

Influence of Temperature Change on Closure Process of the Cantilever of New CCTV Headquarters

作　　者：郭彦林[1] 田广宇[1] 刘学武[1] 

机构地区：[1]清华大学,北京100084

出　　处：《施工技术》2008年第5期1-4,8,共5页Construction Technology

摘　　要：CCTV新台址主楼大悬臂合拢前后两塔楼的受力性能和变形趋势由"单独受力,独立变形"转变为"共同受力,协调变形"。而温度变化对合拢阶段结构的内力和位形有较大影响,尤其是对"七点对接"的7根构件是否安全有很大影响。计算温度内力的难点在于准确确定温度场,但目前《建筑结构荷载规范》GB50009-2001中没有给出建筑结构的温度场分布。针对CCTV新台址主楼在合拢阶段的情况,模拟了一天当中结构温度分布的变化,计算了此温差产生的内力和位移,验算了合拢构件的安全性,分析了对接构件的锁定温度内力的发展情况,为大悬臂合拢施工提供了依据。For the new CCTV headquarters, after the closure of the cantilever, its load-carrying behavior and deformation will transfer from the separate situation to combined one. In this process, temperature change has a significant influence on the internal force and displacement of the structure, especially on the safety of the connecting members. Since the Load Code for the Design of Building Structures GB50009-2001 does not offer the method to calculate the temperature field, it is difficult to determine the distribution of temperature accurately. In this paper, a method to determine the temperature field is given. Based on the distribution of temperature, the internal force and deformation due to the temperature change in a single day is calculated. The fixed temperature internal force is evaluated, and the safety of the key members in closure process is checked. Locking temperature internal force development of butted components are analyzed. All gained data provides basis for closure construction.

关 键 词：钢结构 温度内力 变形 太阳辐射照度 

分 类 号：TU393.3[建筑科学—结构工程]