汽机房钢屋架在多维多点激励作用下地震响应分析

Seismic response analysis of steel roof truss of turbine room undermulti-support and multi-dimension seismic excitation

为了研究行波效应对汽机房屋面钢屋架结构的影响,采用大质量法对某汽机房钢屋架结构进行了多维多点激励作用下地震响应计算,并与多维一致激励计算结果进行对比.研究结果表明:考虑行波效应后,在所分析的控制杆件中,支柱轴力减小剪力增大,而钢屋架上弦杆轴力及支柱斜腹杆受影响相对较小,建议在实际工程中对支柱节点进行加强处理,并对修建在高烈度区及场地情况差的汽机房屋面钢屋架结构进行多维多点激励时程分析补充计算.

In order to study the influence of travelling wave effect on the steel roof truss of turbine room,the large mass method(LMM)is used on the steel roof truss of turbine room under multi-support and multi-dimension seismic excitation;consistent with the calculated results of uniform excitation.The results show that:In the analysis of the control bar,after considering the travelling wave effect,the pillar axial force is reduced,shear force increases.The upper chord axial force and the pillar of steel roof truss inclined web member affected is relatively small.It is suggested to strengthen the backbone nodes in actual engineering,and take the time-history analysis on the steel roof truss of turbine room under multi-support and multi-dimension seismic excitation,which is built in the high seismic intensity area and bad site conditions.