大跨径悬索桥反应谱分析时应考虑振型数量研究  

Study on Number of Response Spectra Analysis Mode for Long Span Suspension Bridge

作　　者：李高超[1] 周琴[2] 

机构地区：[1]长安大学公路学院,西安710064 [2]东北大学江河建筑学院,沈阳110004

出　　处：《四川理工学院学报（自然科学版）》2016年第1期82-86,共5页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

摘　　要：在使用多振型反应谱法进行抗震分析时,应先确定应该考虑的振型数,以减小计算工作量。通过某大跨径悬索桥算例,分析了不同振型参与质量系数下的反应谱计算结果。计算结果表明:对于大跨径悬索桥,规范给出的90%法则对于水平向的地震动能满足要求,且具有较高的精度;对于竖向地震的反应结果,尤其是轴力响应结果波动大,应该考虑更多的振型数计算。In using multi mode response spectrum method for seismic analysis, the number of modes should be firstly considered in order to reduced computational work load. Taking a long span suspension bridge as an example, the calculation results of the response spectrum of different type of vibration modes are annlyzed. The calculation results show that for long span suspension bridge, the 90% rules given by the specification can meet the requirements of horizontal seismic energy and have high psecision ; for vertical seismic response results, especially the result of the axial force response, more modes should be considered.

关 键 词：大跨径悬索桥 振型数 振型参与质量系数 90%法则 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]