复杂形体钢框架-钢板核心筒结构的抗震性能研究

Seismic performance of a complex shape steel frame-steel plate shear wall core tube structure

首先,使用ABAQUS软件,分析研究了超高层钢框架-钢板核心筒结构(宁夏电视塔方案III)的动力特性。数值结果表明:结构方案III的侧向刚度比钢框架-支撑核心筒结构(方案I)大,扭平周期比减小,扭转效应相应地减弱。钢板剪力墙的条带模型(Strip Model,SM)不仅能准确地模拟出钢板的屈曲后行为,而且能明显地节省计算资源。因此,接着,基于开发出的抗震钢板剪力墙条带模型用户单元子程序(称为UEL for SM),进行9度罕遇地震(620 cm/s2)作用下结构的弹塑性动力时程分析,以检查结构的变形指标和塑性发展情况。数值结果表明:结构的最大层间位移角出现在中部楼层段,结构构件的屈服机制合理体现多道抗震防线。

The dynamic characteristics of a super high-rise steel frame-steel plate shear wall （SPSW）core structure （scheme III of the Ningxia TV tower）were studied with resorting to ABAQUS code.The numerical results indicate that in contrast to the super high-rise steel frame-concentrically braced frame（CBF）core structure （scheme I）,the scheme III has larger lateral resistant stiffness,thus with a smaller ratio of the first torsional period to the first translational one （referred here to as FTFTR）and correspondingly less torsional effect.The strip model （SM）for steel plate shear walls （SPSWs）with tension-only strips can not only accurately capture （satisfactorily predict）their post-buckling behaviors, but also save the cost of computation.Based on the commercially available finite-element software package ABAQUS, including a user subroutine,referred to as UEL for SM,the seismic responses of the structure under 9 degree （620cm/s2 ） rare earthquakes were investigated using the dynamic elasto-plastic time-history analysis to check the deformation indices and development of the plastic zones of the structure.The numerical results demonstrate that the inelastic deformations meet the requirements of code for seismic design of buildings.Likewise the middle story segment is the weaker part,which is right the slender-waist of the structure.Therefore,the Ningxia TV tower can meet the requirement of no damage under frequent earthquakes,repairable damages under basic earthquakes and no collapse under rare earthquakes.