能力谱方法在桥梁抗震性能评估中的适用性
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摘要
为了探讨能力谱方法在桥梁抗震性能评估中的适用性,基于能力谱方法的基本原理,分别以4跨规则连续刚构桥和不规则的特大桥为例,采用能力谱方法和时程方法,分别计算了桥梁在不同地震水平下的地震响应,并将两种方法的计算结果进行了比较。结果表明:对于以一阶振型为主、受高阶振型影响较小的规则桥梁,能力谱方法相对于时程方法,其算法简单,精度满足要求,在桥梁抗震性能评估中具有一定的合理性和实用性;对于振动特性复杂的不规则大跨高墩桥梁,能力谱方法与时程方法存在较大误差,在抗震性能评估中应以时程分析方法为准。
In order to improve the application of the capacity spectrum method in anti-seismic of bridges,this paper calculated and compared the response of the bridge in the earthquake of different intensities based on the principle of the capacity spectrum method.Through comparing the result of the capacity spectrum method and time-history method based on a continuous rigid frame bridge with four spans and an irregular great bridge,it is found that the capacity spectrum method as one of the elasto-plastic analysis methods is useful and rational in evaluating the anti-seismic character of bridges which is mainly effected by the basic mode and seldom effected by higher mode,while the time-history method is much more appropriate for the long-span and irregular bridge.
In order to improve the application of the capacity spectrum method in anti-seismic of bridges,this paper calculated and compared the response of the bridge in the earthquake of different intensities based on the principle of the capacity spectrum method.Through comparing the result of the capacity spectrum method and time-history method based on a continuous rigid frame bridge with four spans and an irregular great bridge,it is found that the capacity spectrum method as one of the elasto-plastic analysis methods is useful and rational in evaluating the anti-seismic character of bridges which is mainly effected by the basic mode and seldom effected by higher mode,while the time-history method is much more appropriate for the long-span and irregular bridge.
引文
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[10]JTG/T B02—01—2008,公路桥梁抗震设计细则[S].
[11]潘龙.基于推倒分析方法的桥梁结构地震损伤分析与性能设计[D].上海:同济大学,2001.
[2]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,1992.
[3]肖明葵,严涛,王耀伟,等.弹塑性反应谱研究综述[J].重庆建筑大学学报,1999,21(5):117-121.XIAO Ming-kui,YAN Tao,WANG Yao-wei,et al.Areview and analysis of seismic response spectra ofelastic-plastic structures[J].Journal of ChongqingJianzhu University,1999,21(5):117-121.
[4]卢华.性能设计中的能力谱方法研究与工程应用[D].大连:大连理工大学,2005.
[5]张海燕.基于位移的概率地震需求分析与结构抗震设计研究[D].长沙:湖南大学,2005.
[6]张晨南.推倒分析方法在高架桥系统抗震分析中的应用[D].上海:同济大学,2003.
[7]王钧利,贺拴海.高墩大跨连续刚构弯桥全过程非线性稳定分析[J].长安大学学报:自然科学版,2008,28(3):49-52.WANG Jun-li,HE Shuan-hai.Nonlinear stability oflong-span curve rigid bridge with high piers in wholeprocess[J].Journal of Chang an University:NaturalScience Edition,2008,28(3):49-52.
[8]王建民,朱曦.地震作用下高架桥结构的脆弱性[J].中国公路学报,2007,20(1):68-72.WANG Jian-min,ZHU Xi.Fragility of viaduct struc-ture under seismic effect[J].China Journal of High-way and Tansport,2007,20(1):68-72.
[9]周勇军,彭晓彬,赵煜,等.简支梁桥顺桥向地震动分析[J].交通运输工程学报,2007,7(6):86-89.ZHOU Yong-jun,PENG Xiao-bin,ZHAO Yu,et al.Analysis of longitudinal seismic vibration for simply-supported beam bridge[J].Journal of Traffic andTransportation Engineering,2007,7(6):86-89.
[10]JTG/T B02—01—2008,公路桥梁抗震设计细则[S].
[11]潘龙.基于推倒分析方法的桥梁结构地震损伤分析与性能设计[D].上海:同济大学,2001.
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