CCTV主楼施工过程关键构件应力监测技术

Stress Monitoring Technique for CCTV Main Tower during Construction

CCTV主楼双向倾斜的两塔楼在高空通过巨型悬挑结构连成一体,建筑造型独特,结构转换部位多,受力复杂。结构施工方法特殊,难度大,且悬臂施工阶段受力体系与成型后整体结构体系有明显不同。为此,对关键构件(特征位置构件、转换桁架构件、延迟构件等)进行应力监测,并将监测结果与施工模拟分析结果进行对比分析,及时反馈以保证塔楼尤其是超大悬臂施工过程的安全性。

The profile of CCTV main tower is unique, with a huge cantilever at the top linking two bidirectional leaning sub-towers as integrity. The structure is complicated and has many transferring structure. The construction method is special and the process is very difficult. The bearing system of the huge cantilever during construction has much discrepancy with the finished integral structure system. The stresses of the key members such as characteristic position members, transferring structure and construction-delayed members were monitored. The monitoring results were compared with the FEA analysis results. Information was fed back in time to secure the construction safety of the tower, especially the huge cantilever structure.