四边支承单层柱面网壳减震体系性能分析

探讨约束屈曲支承(BRB)在四边支承单层柱面网壳结构减震中的适用性。采用有限元分析程序ANSYS,分别对无支撑柱面网壳、加BRBs柱面网壳、加传统支撑柱面网壳做了动力时程响应分析,比较3种情况下网壳节点位移和杆件内力变化情况,分析BRBs消能减震效果,同时对BRBs布置方案做了优化.在网壳屋盖内合理布置BRBs可有效吸收地震能量从而减小网壳结构自身的地震响应,结构位移及杆件内力大幅度下降.BRBs工作性能明显优于传统支撑.

Analysis of vibration performance of single-layered cylindrical lattice shells reducted-system supported at four sides

Applicability of buckling-restrained-brace for vibration reduction of single-layered cylindrical lattice shell supported at four sides would be discussed.The finite element analysis software "ANSYS" was to be used for analysis of seismic time-history process response of traditional structures without braces,with BRBs,and with traditional braces,The displacement of nodes on the lattices shell and variation of inner force of its rods were compared with each other for the three cases,the vibration reduction effect of BRBs was analyzed,and the lay-out scheme of BRBs was optimized,also.Reasonable layout of BRBs made seismic energy effectively be absorbed by BRBs,so that the response of lattice shell roof to the earthquake was reduced to a great extent.The vibration reduction capacity of brace element BRB was obviously superior to that of the traditional brace element.