上海市某超高层偏筒结构分析与设计

Analysis and design of a super high⁃rise structure with core wall offset in Shanghai city

由于建筑功能、效果的需要,偏筒结构在高层及超高层项目中数量逐渐增多。位于上海市某280m超高层偏筒结构采用了钢管混凝土柱-钢框架-钢筋混凝土筒体的结构体系。结构设计的主要难点在于筒体偏置导致结构在地震与风荷载作用下产生较大的扭转效应;筒体部分因电梯井道开洞使得最外侧墙体易处于受拉状态,且因质量、刚度不均匀结构在竖向力作用下将产生较大的水平位移。分别对结构的抗扭性能、筒体墙构件承载力、考虑收缩徐变的结构整体水平变形进行了详细的分析,并通过大震弹塑性验证了结构整体及各构件均满足设定的性能目标,保证了结构整体及构件的安全可靠。

Due to the functional and aesthetic requirements,offset core wall structures is gradually increasing in high⁃rise and super high⁃rise projects.The structural system of concrete⁃filled steel tube columns⁃steel frames⁃concrete shear wall cores is adopted in a 280m super high⁃rise building with an offset core wall structure in Shanghai city.The main challenge in structural design lies in the significant torsional effects induced by the offset core wall under seismic and wind loads.Openings for elevator shafts in the core wall result in the outermost walls being subjected to tension,and uneven mass and stiffness distribution lead to considerable horizontal displacements of the structure under vertical loads.Detailed analyses were conducted focusing on the structural torsional resistance,bearing capacity of core wall components,and overall horizontal deformation considering shrinkage and creep.The seismic performance of the overall structure and its components in line with the set performance objectives were verified through rare earthquake elastoplastic analysis,which ensure the safety and reliability of the overall structure and its components.