施工过程对上海中心幕墙支撑结构的影响分析

Analysis on Effect of Construction on Curtain Wall Support Structure of Shanghai Tower

摘要:

通过对上海中心大厦幕墙支撑结构和主体结构的施工模拟分析，研究了幕墙支撑结构的变形预调值,并对主体结构变形引起的支撑结构附加内力进行了详细分析.研究表明，采用传统逐层找平的施工方法，施工完成后环梁与设计标高仍存在较大偏差，采用吊点预抬高和吊杆长度调整的措施对环梁标高进行预调整可保证幕墙的几何形态和安全使用；巨柱区间压缩量会引起幕墙支撑结构与主体结构楼面发生数值较大且分布规律复杂的竖向位移差，需通过施工模拟方法对幕墙支撑结构与主体结构间的滑动节点在主体压缩下的滑动行程进行确定，同时巨柱压缩也会引起径向支撑较大的附加弯矩，最大附加弯矩应力比达到0.3，其对幕墙支撑结构安全的影响不容忽视.

Abstract:

Based on the construction simulation analysis of Shanghai Tower, the preset deformation of suspend curtain wall support structure (CWSS) was studied, and additional internal forces in CWSS caused by the compression of super column were analyzed in detail. The analysis results shown that if the traditional methods of construction, that is, the ring beam is calibrated level by level, is used, the elevation of ring beam will be off the correct level after construction is completied. If the preraising of suspension point and preadjustment of the length of sag rod is adopted, the curtain wall service and geometry can be ensured. The compression of super column can lead to a relative displacement, which is large and complicated, between ring beams and floors of main structure. Construction simulation analysis should be conducted to determine the slide range of the sliding joint between CWSS and main structure under the compression of main structure. And the additional moment of radial strut caused by compression of super column is equivalent to 30% capacity of moment of radial strut. Its adverse effects on the CWSS cannot be ignored.