上海中银金融中心罕遇地震弹塑性时程分析

Structural elastoplastic time-history analysis of BOC Shanghai international financial center in rare earthquake

上海临港西岛金融中心由南北双塔楼及裙房组成,塔楼结构高度均为195m,结构体系采用框架+巨型支撑-核心筒结构,结合34F单侧悬挑平台形成结构加强层(设置悬挑桁架和环桁架)。对结构进行7度(0.1g)的罕遇地震弹塑性时程分析,结果表明结构在罕遇地震作用下发生损伤,使得弹塑性分析的基底剪力较弹性分析的基底剪力小;X方向最大层间位移角为1/155,Y方向最大层间位移角为1/169,均小于1/100的规范限值要求,结构在罕遇地震作用下的弹塑性变形满足性能目标;大部分连梁发生中度~重度损伤,核心筒和巨型支撑局部出现轻度损伤,框架柱、悬挑桁架、伸臂桁架和环桁架基本保持弹性,无损伤,加强层楼板在核心筒角部区域发生中度损伤,伸臂桁架弦杆区域发生严重损伤。

BOC Shanghai international financial center is composed of north and south twin towers and podium buildings.The tower structures are 195m high.The structural system adopts a frame+mega brace-corewall structure,combined with a 34F single side cantilever platform to form a structural reinforcement layer(with cantilever truss and ring truss).The elastoplastic time history analysis of the structure under 7 degree(0.1g)rare earthquake shows that the damage of the structure under rare earthquake makes the base shear force of elastoplastic analysis smaller than that of elastic analysis.The maximum interstory drift in X direction is 1/155,and the maximum interstory drift in Y direction is 1/169,both of which are less than the specification limit value requirements of 1/100.The elastoplastic deformation of the structure under rare earthquake meets the performance target;Most of the coupling beams are moderately to severely damaged,and some of the corewall and mega braces are slightly damaged.The frame columns,cantilever truss,outrigger trusses and ring trusses are basically elastic without damage.The slab of story with outriggers and belt members is moderately damaged in the corner area of the corewall,and the chord member area of the outrigger truss is severely damaged.