横向非等高双柱式桥墩抗震性能研究

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英文篇名：Study of Seismic Performance of Transversely Unequal-Height Double-Columned Piers 作者：郝晓光 ; 唐辉 ; 邵帅 ; 王龙 英文作者：HAO Xiao-guang;TANG Hui;SHAO Shuai;WANG Long;CCCC Infrastructure Maintenance Group Co.,Ltd.;School of Civil Engineering,Chongqing Jiaotong University; 关键词：山区桥梁 ; 横向非等高双柱式桥墩 ; 抗震性能 ; IDA ; 弯矩～曲率关系 ; 曲率 ; 位移 ; 有限元法 英文关键词：bridge in mountainous region;;transversely unequal-height double-columned pier;;seismic performance;;IDA;;bending moment-curvature relation;;curvature;;displacement;;finite element method 中文刊名：GWQL 英文刊名：World Bridges 机构：中交基础设施养护集团有限公司;重庆交通大学土木工程学院; 出版日期：2019-05-28 出版单位：世界桥梁 年：2019 期：v.47;No.199 基金：国家自然科学基金青年科学基金项目(51308571) 语种：中文; 页：GWQL201903011 页数：6 CN：03 ISSN：42-1681/U 分类号：57-62

摘要

为研究墩高差对横向非等高双柱式桥墩抗震性能的影响,以某山区3×(5×30)m梁桥为背景,建立OpenSees全桥有限元模型,采用增量动力分析方法(IDA),输入地震动,分析不同墩高差下墩柱关键截面的弯矩～曲率关系、曲率、墩顶位移以及曲率与位移关系。结果表明:地震荷载作用下,当墩高差在10m以上时对系梁位置处桥墩截面延性影响较大,随墩高差增加,与横向等高双柱式桥墩相比,墩顶截面延性有所减小,墩底截面延性增加较大;受墩高差影响,墩底与系梁位置处桥墩曲率在屈服后对地震动强度变化更敏感;墩顶位移总体与墩高差成反相关,墩高差对墩顶位移的影响在峰值加速度PGA=0.5g后差异较大,PGA由0.5g增加到1.0g时,随墩高差增大,墩顶位移减小量逐渐变小;受墩高差影响,横向非等高双柱式桥墩破坏模式差异显著。
        To study the influence of pier height difference on the seismic performance of transversely unequal-height double-columned piers,a beam bridge with spans of 3×(5×30)m in the mountainous region was taken as the study background.The software OpenSees was used to establish the finite element model of the overall bridge,to which the ground motion was input by the incremental dynamic analysis(IDA)method.The relations of bending moment and curvature,curvature,pier-top displacement and the relations of curvature and displacement of the key pier column sections were analyzed,in the contexts of different pier heights.The results show that when exceeding 10 m,the height difference will exert great influence on the section ductility in the piers at the locations of tie beams,under seismic loads.As the pier height difference increases,ductility in the pier-top cross section decreases,but the ductility in the pier-base cross section significantly increases.Due to the influence of pier height difference,the pier curvatures in the pier base and at the locations of the tie beams after yielding are more sensitive to the undulation of ground motion intensity.The pier-top displacement is,at large,inversely proportional to pier height difference.There appears great variation of influence of pier height difference on the pier-top displacement,when the peak ground acceleration is 0.5 g.When the peak ground acceleration rises from 0.5 g to1.0 g,the decreasing amount of the pier-top displacement gradually drops,as the pier height difference increases.Due to the existence of pier height difference,the damage mode variation of transversely unequal-height double-columned piers is distinct.

引文

[1]夏春旭,柳春光.近断层多脉冲地震作用下桥梁墩柱地震风险分析[J].世界桥梁,2018,46(3):56-61.
    [2]董方超,孙广俊,李鸿晶.横系梁对双柱墩混凝土曲线梁桥地震反应的影响分析[J].世界桥梁,2015,43(3):75-81.
    [3]刘文华,黎立新.山区高墩桥梁抗震设计[J].公路,2010(7):67-72.
    [4]夏修身,陈兴冲,艾宗良.新型铁路桥墩的抗震性能研究[J].桥梁建设,2017,47(5):12-17.
    [5]张永亮,王云,陈兴冲,等.双薄壁墩连续刚构桥地震反应影响参数分析[J].桥梁建设,2018,48(4):17-21.
    [6]王克海,韦韩,李茜,等.中小跨径公路桥梁抗震设计理念[J].土木工程学报,2012(9):115-121.
    [7]贾毅,赵人达,廖平,等.高烈度地区多跨长联连续梁桥抗震体系研究[J].桥梁建设,2017,47(5):41-46.
    [8]孙治国,司炳君,陈灿,等.山区桥梁排架抗震能力评价方法[J].振动与冲击,2015,34(18):1-6.
    [9]Marsh M L,Brown C B.Effects of Column Flexural Strength on the Seismic Response of a Multiple-column Bridge Bent[J].Earthquake Spectra,1994,10(4):757-776.
    [10]闫冬,袁万城.多跨连续梁桥横桥向抗震的概念设计[J].同济大学学报,2003,31(11):1 275-1 279.