双层柱面网壳结构在BRB作用下的减震分析

Vibration reduction analysis of double-layer cylinder lattice shell with bucking-restrained brace

运用SAP2000有限元软件对跨度30 m,长度42 m的正放四角锥双层柱面网壳建立模型,并进行模态分析和力学性能分析。在EL-Centro波作用下对支撑布置位置不同和布置数量不同时的网壳结构进行地震响应分析。结果表明:防屈曲支撑在双层柱面网壳中替换部分杆件时可以起到较好的减震效果,其中替换受力较大的腹杆要比替换其他位置杆件的减震效果要好,而在替换腹杆的不同方案中,替换了48根杆件的减震效果明显优于替换20根杆件的效果。

The model of square pyramid double-layer cylindrical lattice shell with 30 m span and 42 m length was established for modal analysis and mechanical property analysis by use of the finite element analysis software SAP2000.The seismic response analysis of the shell structures was carried out with the bucking-restrained braces in different locations and different numbers under the EL-Centro wave.The results show that replacing some bars with the bucking-restrained braces in the double-layer cylindrical lattice shell could strengthen the damping effect.The replacement of the web members bearing more loads has a better damping effect than the replacement of other members,and the effect of replacing 48 web members is better than replacing 20 web members in the web-member replacement scheme.