某高层钢框架-中心支撑结构分析与设计

Structural analysis and design of a high-rise steel concentrically-braced frame

以某高层钢框架一中心支撑结构为例,介绍了塔楼结构方案的比选过程,确定了结构的性能化设计目标及抗震措施;采用YJK和ETABS两种软件对塔楼进行分析对比得出,结构各项整体指标均满足规范要求;采用时程分析法对结构进行多遇地震下的补充分析,对计算结果进行包络设计;采用PERFORM-3D软件对结构进行罕遇地震作用下的动力弹塑性时程分析。结果表明,结构塑性发展程度可控,在进人弹塑性受力阶段后仍然具有较高的刚度和强度;采用ETABS,MIDAS Gen软件对跃层斜撑抗侧刚度、穿层柱屈曲进行专项分析得出,结构安全可靠。

Taking a high-rise steel concentrically-braced frame structure as an example,the selection process of tower building structure schemes was introduced,and the performance-based design objectives and seismic measures were determined.YJK and ETABS softwares were used to analyze and compare the tower building,and it's concluded that the overall indices of the structure meet the requirements of the code.The time-history analysis method was used to supplement the analysis of the structure under frequent earthquakes,and the envelope design of the calculation results was carried out. The PERFORM-3D software was used to carry out dynamic elastic-plastic analysis of the structure under rare earthquakes, and the results show that the degree of plasticity development of the structure is controllable and it still has high stiffness and strength after entering the stage of elastic-plastic mechanical loading.By using ETABS and MIDAS Gen softwares, special analyses were conducted on the lateral stiffness of floor-skipped brace and buckling of floor-skipped columns to conclude that the structure is safe and reliable.