某大高宽比超高层结构分析与设计

Design and analysis for a super high-rise structure with large aspect ratio

某框架-核心筒结构高249.95m,Y向高宽比达到8.2。重点分析了结构的刚重比、层间位移角、剪力墙名义拉应力等参数指标,并通过在避难层设置一道加强层,有效提高了结构侧向刚度,使得刚重比等控制参数满足规范要求。通过对一榀贯通剪力墙伸臂桁架的有限元分析表明,匹配的伸臂桁架刚度可使得伸臂桁架及相连的剪力墙及相关节点满足性能目标。针对结构存在斜柱的特点,分析了斜柱起始层拉力情况,并通过采取与斜柱相连的框架梁设置型钢梁及斜柱与核心筒之间设置暗梁等措施,有效降低了斜柱对结构产生的影响;对上述关键部位采取相应的加强措施后,对主体结构进行了大震动力弹塑性分析,结果表明各构件能够满足预定的性能目标。

The height of a frame-corewall structure is 249.95 m and the Y-directional aspect ratio reaches 8.2. The stiffness-gravity ratio, inter-story drift angle, shear wall nominal tensile stress and other parameters of the structure were analyzed. By setting an outrigger reinforcement layer in the refuge layer, the lateral stiffness of the structure was effectively improved, and the stiffness-gravity ratio and other control parameters could meet the specification requirements. The finite element analysis of an outrigger truss perforating the shear wall shows that the outrigger truss, the connected shear walls and the associated joints can meet the performance objectives with the matching stiffness of the outrigger truss. According to the characteristics of the inclined column, the tension of the initial layer of the inclined column was analyzed, and the influence of the inclined column on the structure was effectively reduced by adopting the frame girder setting type steel girder connected with the inclined column and the hidden girder between the inclined column and the corewall. After taking the corresponding strengthening measures to the above key parts, the dynamic elastoplastic analysis of the main structure under large earthquake was carried out, the result shows that each component can meet the predetermined performance target.