重力作用下上海中心幕墙支撑结构与主结构协同分析

上海中心大厦外幕墙系统采用了分区悬挂的柔性幕墙支撑结构体系,各区段幕墙支撑结构顶部及底部均支承于弹性的主体结构边界(设备层/休闲层)上.各区幕墙系统悬挂重量重,以及由设备层/休闲层的竖向支承刚度柔且分布不均匀导致的设备层/休闲层的竖向变形大且分布不均,都将给支撑结构系统安全带来不利影响.通过将幕墙支撑结构与主体结构进行整体建模,对重力荷载作用下幕墙支撑结构与主体结构的协同工作特性,即幕墙支撑结构不均匀竖向变形特性,及其对幕墙板块安全、支撑结构受力的影响进行了详细的分析.并依据分析结果对设备层刚度、幕墙结构与主体结构的连接构造进行了优化调整,以改善幕墙系统变形与受力,确保幕墙系统的使用安全.

Analysis on Properties of Cooperative Work of Curtain Wall Support Structure with Main Structure of Shanghai Tower Under Gravity Loads

A unique flexible suspend curtain wall support structure (CWSS) was ultimately developed to suit the exterior curtain wall system of Shanghai Tower. The top and bottom of CWSS are supported by the elastic boundary (MEP/ amenity floor) of main structure in each zone. The nonuniform and weak stiffness of MEP/amenity floor and heavy weight of CWSS lead to a nonuniform vertical deformation, which has adverse effects on CWSS. By means of integrated model including CWSS and main structure, the properties of cooperative work of CWSS were analyzed in detail, including the properties of nonuniform deformation of CWSS and its effect on the internal forces of CWSS and the safety of curtain wall plates. Based on the analysis results, the stiffness of MEP/amenity floor and the connection details between CWSS and main structure were optimized and adjusted in order to improve the deformation and internal force of CWSS. These optimization and adjustment measures ensure the safety of curtain wall system.