双柱式高墩桥梁地震响应结构参数影响分析
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摘要
以西南山区高速公路常用的双柱式高墩桥梁为研究对象,建立了考虑支座与上下部结构耦联的空间动力分析模型,通过大量分析计算,分别详细讨论了墩高变化、桩土作用、单联与多联模型、单联不同跨数、单联与单墩模型以及地形条件等参数对地震响应结果的影响程度与规律。结果表明:桩底简化固结模型可以适用于常规设计;单联模型可用于纵向地震反应分析,而对于横向地震反应分析宜采用多联模型;单联不同跨数模型对计算结果影响较小;采用单墩模型进行纵向地震反应计算的结果总体上偏于不安全;不同地形条件对桥墩的地震作用影响较大。
In order to research double-column highway bridge with high piers in southwest mountain area,the spatial dynamic model considering the coupling of bearings,superstructures and substructures was established.The effects of some structural parameters on bridge seismic responses were studied in detail respectively.These parameters include height of piers,pile-soil interaction,single-segment and multi-segments models,single-segment model with different span numbers,single-segment and single-pier model,and terrain conditions.The results show that(1) the simply fixed pile bottom model can be used for conventional design;(2) the single-segment model can be used for longitudinal seismic response analysis,while multi-segments model should be adopted for transversal seismic response analysis;(3) the single-segment model with different span numbers has negligible influence on analysis results;(4) the results of longitudinal seismic response analysis using single-pier model generally tend to be unsafe;(5) different terrain conditions have great influence on seismic response of piers.
In order to research double-column highway bridge with high piers in southwest mountain area,the spatial dynamic model considering the coupling of bearings,superstructures and substructures was established.The effects of some structural parameters on bridge seismic responses were studied in detail respectively.These parameters include height of piers,pile-soil interaction,single-segment and multi-segments models,single-segment model with different span numbers,single-segment and single-pier model,and terrain conditions.The results show that(1) the simply fixed pile bottom model can be used for conventional design;(2) the single-segment model can be used for longitudinal seismic response analysis,while multi-segments model should be adopted for transversal seismic response analysis;(3) the single-segment model with different span numbers has negligible influence on analysis results;(4) the results of longitudinal seismic response analysis using single-pier model generally tend to be unsafe;(5) different terrain conditions have great influence on seismic response of piers.
引文
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[12]SAADEGHVAZIRI M A,YAZDANI-MOTLAGH A R.Seismic Behavior and Capacity/Demand Analyses of ThreeMulti-span Simply Supported Bridges[J].EngineeringStructures,2008,30(1):54-66.
[13]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN Lichu.Seismic Study of Bridges[M].Shanghai:Tongji University Press,1997.
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[2]范立础,李建中.汶川桥梁震害分析与抗震设计对策[J].公路,2009(5):122-128.FAN Lichu,LI Jianzhong.Seismic Damage Analysis andthe Measure of Seismic Design for Bridge after WenchuanEarthquake[J].Journal of Highway,2009(5):122-128.
[3]周国良,崔成臣,刘必灯,等.汶川8.0级地震中几座近断层桥梁失效模式的初步探讨[J].震灾防御技术,2008,3(4):370-378.ZHOU Guoliang,CUI Chengchen,LIU Bideng,et al.Failure Modes of Near-fault Bridges in WenchuanEarthquake[J].Technology for Earthquake DisasterPrevention,2008,3(4):370-378.
[4]李茜,王克海,韦韩.高墩梁桥地震响应分析[J].地震工程与工程振动,2006,26(3):74-76.LI Qian,WANG Kehai,WEI Han.Seismic ResponseAnalysis for Girder Bridges with Tall Piers[J].Earthquake Engineering and Engineering Vibration,2006,26(3):74-76.
[5]王蕾,赵成刚,王智峰.考虑地形影响和多点激励的大跨高墩桥地震响应分析[J].土木工程学报,2006,39(1):50-59.WANG Lei,ZHAO Chenggang,WANG Zhifeng.SeismicResponse Analysis of Continuous Rigid-framed Bridge withHuge Piers Considering Topographic Effects and Multi-support Excitations[J].China Civil Engineering Journal,2006,39(1):50-59.
[6]王常峰,陈兴冲,夏修身.高墩大跨连续刚构桥抗震设计参数优化[J].公路交通科技,2006,23(4):80-83.WANG Changfeng,CHEN Xingchong,XIA Xiushen.Optimization of Design Parameters of High-pier and Long-span Continuous Rigid Frame Bridge[J].Journal ofHighway and Transportation Research and Development,2006,23(4):80-83.
[7]何钦象,田小红,宋丹.高墩大跨径连续刚构桥抗震性能评估[J].振动与冲击,2009,28(1):68-71.HE Qinxiang,TIAN Xiaohong,SONG Dan.A SeismicPerformance Evaluation of a Long-span Continuous RigidFrame Bridge with Tall Piers[J].Journal of Vibrationand Shock,2009,28(1):68-71.
[8]中华人民共和国交通部.JTG D63-2007公路桥涵地基与基础设计规范[S].北京:人民交通出版社,2007.P.R.China.Ministry of Communications.JTG D63-2007 Code for Design of Ground Base and Foundation ofHighway Bridges and Culverts[S].Beijing:ChinaCommunications Press,2007.
[9]中华人民共和国交通运输部.JTG/T B02-01-2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.P.R.China.Ministry of Transport.JTG/T B02-01-2008 Guidelines for Seismic Design of Highway Bridges[S].Beijing:China Communications Press,2008.
[10]高玉峰,蒲黔辉,李晓斌.大跨长联预应力混凝土连续梁桥地震反应分析[J].工程抗震与加固改造,2009,31(2):21-25.GAO Yufeng,PUQianhui,LI Xiaobin.Seismic ResponseAnalysis of PC Continuous Beam Bridge with Large Spans[J].Earthquake Resistant Engineering and Retrofitting,2009,31(2):21-25.
[11]NIELSON B G,DESROCHES R.Seismic PerformanceAssessment of Simply Supported and Continuous MultispanConcrete Girder Highway Bridges[J].Journal of BridgeEngineering,ASCE,2007,12(5):611-620.
[12]SAADEGHVAZIRI M A,YAZDANI-MOTLAGH A R.Seismic Behavior and Capacity/Demand Analyses of ThreeMulti-span Simply Supported Bridges[J].EngineeringStructures,2008,30(1):54-66.
[13]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN Lichu.Seismic Study of Bridges[M].Shanghai:Tongji University Press,1997.
[14]王克海.桥梁抗震研究[M].北京:中国铁道出版社,2007.WANG Kehai.Seismic Study of Bridges[M].Beijing:China Railway Publishing House,2007.
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