全框支剪力墙超限高层抗震关键问题分析设计

Analysis and Design of Key Seismic Issues for High rise Buildings with Full Frame Supported Shear Walls Exceeding the Limits

某全框支剪力墙超限高层,B级高度,存在凸凹、竖向构件全转换等多项不规则。为使结构具有较高的抗震性能,采用性能化设计,用Midas和SAUSG等软件进行各地震作用下的弹性、弹塑性计算分析,验证结构抗震性能水平。为解决结构上强下弱问题,分析转换层裙房构件对塔楼抗震性能的影响,提出充分利用转换层裙房不影响各地铁限界的位置布置足够多剪力墙的设计思路,使转换层形成框剪结构,地震时剪力墙起第一道抗震防线,保护转换柱,并对转换层楼板、基础埋深进行专项分析。用倒塌易损性分析法定量评估结构的抗倒塌能力。结果表明,结构在各地震动强度下的倒塌概率可接受,转换层抗倒塌能力高于上部塔楼,结构构件具有良好的屈服顺序,达到了预设性能目标。

A fully frame supported shear wall exceeds the limit of a high-rise building,with a B-level height and multiple irregularities such as convexity and concavity,and full conversion of vertical components.In order to achieve high seismic performance of the structure,performance-based design was adopted,and software such as Midas and SAUSG were used to perform elastic and elastoplastic calculations and analysis under various seismic actions to verify the seismic performance level of the structure.To solve the problem of strong upper and weak lower structures,the influence of the components of the transfer story podium on the seismic performance of the tower was analyzed.A design idea was proposed to fully utilize the position of the transfer story podium that did not affect the subway clearance to arrange enough shear walls,so that the transfer story forms a frameshear wall structure.During earthquakes,the shear walls could act as the first seismic defense line to protect the transfer columns.Furthermore,special analysis on the transfer floor slabs and foundation burial depth were conducted,and the method of collapse vulnerability analysis was used to quantitatively evaluate the seismic collapse resistance.The results indicate that the probability of collapse of the structure under various seismic inten-sities is acceptable,and the seismic collapse resistance of the transfer layer is higher than that of the upper tower.The structural components have a good yield order and have achieved the predetermined performance goals.