长沙五矿广场立面收进超限高层结构设计

Structural design of out-of-code high-rise structure with elevation setbacks in Changsha Minmetals Square

长沙五矿广场项目T1塔楼属于超A级高度的超限高层建筑,采用带环桁架的混凝土框架-核心筒结构体系。塔楼独特的建筑造型使其在21层及31层有立面收进,使用功能也由办公转变成酒店及公寓,并且在机电层布置转换桁架,将上部楼层不能落地的结构柱的荷载传递给主框架柱。采用多个结构分析软件进行了多遇地震及风荷载作用下的弹性分析,并进行了罕遇地震作用下的动力弹塑性时程分析。结果表明:结构能满足设定的抗震性能目标,结构收进所采用的加强措施合理有效。

Changsha Minmetals Square T1 Tower is an out-of-code high-rise building exceeding A-level requirement of height in the Chinese code,which adopts the reinforcement concrete frame-core wall structural system with belt truss.The unique architecture design makes the architectural form have elevation setbacks at 21 and 31 floors and the use function also transforms from the office to the hotel and apartment.The transfer truss was arranged at mechanical room floor to transfer the loads of the structural columns that cannot land on the upper floor to the main frame columns.Multiple structural analysis programs were used to perform elastic analysis under the frequent earthquake and wind load,and perform dynamic elastoplastic time-history analysis under the rare earthquake.The results show that the structure can meet the setting of the seismic performance objectives,and the strengthening measures adopted by the structure for elevation setbacks are reasonable and effective.