昆明某超高层钢结构减震设计与分析

Energy dissipation design and analysis on a super high-rise steel structure in Kunming

俊发城一期10号地块超高层办公楼结构高度195.1m,为高度和高宽比均超限的乙类建筑,结构采用双重抗侧力钢框架-中心支撑（部分屈曲约束支撑）结构体系。基于抗震性能的设计方法,采用YJK,ETABS软件对结构进行了小震作用下的弹性分析,采用SAP2000软件对结构进行了中震及大震作用下的弹塑性分析。结果表明,小震下屈曲约束支撑（BRB）均未屈服,轴力设计值满足设计承载力的要求,中震、大震下BRB均能先于主体结构屈服,且在大震下BRB耗能效果明显,结构的最大层间位移角小于规范限值。在构件设计与验算方面,介绍了BRB与支撑框架处钢梁抗剪连接件的设计方法与验算结果。

With structural height of 195.1 m,the super high-rise office tower building of No.10 Plot of Junfa City belongs to the second-class building,height and height-to-width ratio of which exceeds the requirements of codes.The structural system of the tower adopts the dual lateral resistance steel frame-concentrically braced structure with partial bucklingrestrained braces（BRBs）.Based on the performance-based seismic design method in the aspect of structure calculation,YJK and ETABS programs were used to carry out elastic analysis under frequent earthquake,and SAP2000 program was used to carry out elastic-plastic analysis under fortification and rare earthquakes.Analysis results show that BRBs are not yielding and the axial force meets the requirements of design bearing capacity under frequent earthquake.Under fortification and rare earthquakes,the main structural members are not yield until the BRBs yield.The effect of BRBs on energy dissipation is obvious under rare earthquake,and the maximum structural interlayer displacement angle is less than the standard requirement.In the aspect of component design and checking,the design method and checking results of BRBs and the shear connector of the steel beams for the braced frames were introduced.