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兰州红楼时代广场地下3层,地上56层,结构高度245.60m,采用“矩形钢管混凝土柱-钢梁-钢筋混凝土楼板-钢骨混凝土核心筒”结构体系。通过对比分析,裙房和塔楼之间不设缝,设置2道加强层,伸臂桁架和腰桁架均采用普通钢支撑。采用SATWE,ETABS和MIDAS/Gen等软件进行了小震弹性计算,并比较了安评报告与规范不同的动参数取值所对应的不同结果。结果表明,结构的周期比、层间位移角、楼板舒适度等均满足规范要求。进行弹性动力时程分析时选用七条地震波。核心筒与外框架之间沉降差异会在平面梁中产生较大的附加应力。对屋顶斜柱的三种典型节点进行了的有限元分析结果表明,节点应力较小,没有出现应力集中现象。
Lanzhou Red House Times Square underground three floors, 56 floors above ground, the height of 245.60m structure, using “rectangular concrete filled steel tubular columns - steel beams - reinforced concrete floor - steel reinforced concrete core tube ” structural system. Through comparative analysis, there is no seam between the podium and the tower, two strengthening layers are set, and the extensible arm truss and the waist truss are supported by ordinary steel. Small earthquakes were calculated using SATWE, ETABS and MIDAS / Gen software, and the results of different motion parameter values were compared with those of the safety assessment reports and specifications. The results show that the ratio of the structure period, the drift angle of the floor, the floor comfort and so on all meet the standard requirements. Choose seven seismic waves for elastic dynamic time history analysis. The difference in settlement between the core barrel and the outer frame creates a large additional stress in the plane beam. The finite element analysis of three typical joints of roof inclined column shows that the stress of joints is small and no stress concentration occurs.