多点激励下高墩大跨桥梁抗震性能分析
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摘要
基于OpenSEES平台,建立高墩大跨桥梁的弹塑性结构模型,对比分析在一致地震激励及行波输入下桥梁结构的地震反应特性,并对行波输入下高墩桥梁的破坏过程进行详细研究。分析结果表明,地震波频谱特性及地震动输入方式对桥墩的出铰位置和破坏顺序有较大影响;高墩的破坏主要表现为弯曲破坏,单墩墩顶截面出铰或达到极限状态往往先于墩底截面,设计时应引起重视。
Based on OpenSEES platform,elastic-plastic structural model of long-span bridge with high piers is established.This paper utilizes time-history analysis method to analyze seismic responses of bridge under consistent or multi-support seismic excitation.Seismic performances and failure process for bridge with high piers are studied.Analysis results show that characteristics of seismic excitation and the way of excitation input have some effect on failure sequence and the occurrence or location of plastic hinge for bridge piers.The failure mode for high piers assumes bending failure,and the failure for top of pier is frequently prior to that of pier bottom,which should be paid enough attention.
Based on OpenSEES platform,elastic-plastic structural model of long-span bridge with high piers is established.This paper utilizes time-history analysis method to analyze seismic responses of bridge under consistent or multi-support seismic excitation.Seismic performances and failure process for bridge with high piers are studied.Analysis results show that characteristics of seismic excitation and the way of excitation input have some effect on failure sequence and the occurrence or location of plastic hinge for bridge piers.The failure mode for high piers assumes bending failure,and the failure for top of pier is frequently prior to that of pier bottom,which should be paid enough attention.
引文
[1]刘健新,赵国辉.“5.12”汶川地震典型桥梁震害分析[J].建筑科学与工程学报,2009,26(22):92-97.
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[3]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[4]周国良,鲍叶欣,李小军,等.结构动力分析中多点激励问题的研究综述[J].世界地震工程,2009,25(4):25-31.
[5]柳国环,李宏男,林海.结构地震响应计算模型的比较与分析[J].工程力学,2009,26(2):10-15.
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[7]Mazzoni S,McKenna F,Michael H.Open system for earthquake engineering simulation user manual[R].Pacific Earthquake En-gineering Research Center,University of California,Berkeley,2005.
[8]Scott A,Park R,Priestley M J M.Stress-strain behavior of concrete confined by overlapping hoops at low and high strain rates[J].ACI Structural Journal,1982,79(1):13-21.
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[10]潘强,方诗圣,程晓东.高墩大跨连续刚构桥地震反应的行波效应研究[J].湖南工程学院学报,2010,20(2):82-85.
[2]梁智垚,彭伟.桥梁结构弹塑性地震反应分析新进展[J].世界地震工程,2007,23(4):163-168.
[3]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[4]周国良,鲍叶欣,李小军,等.结构动力分析中多点激励问题的研究综述[J].世界地震工程,2009,25(4):25-31.
[5]柳国环,李宏男,林海.结构地震响应计算模型的比较与分析[J].工程力学,2009,26(2):10-15.
[6]Rosario C,et al.Problems in applying code-specified capacity design procedures to seismic design of tall piers[J].Engineering Structures,2009,31:1811-1821.
[7]Mazzoni S,McKenna F,Michael H.Open system for earthquake engineering simulation user manual[R].Pacific Earthquake En-gineering Research Center,University of California,Berkeley,2005.
[8]Scott A,Park R,Priestley M J M.Stress-strain behavior of concrete confined by overlapping hoops at low and high strain rates[J].ACI Structural Journal,1982,79(1):13-21.
[9]Menegotto M,Pinto P E.Method of analysis for cyclieally loaded reinforced concrete plane frames including changes in geometry and non-elastic behavior of elements under combined normal force and bending[C].Proceedings,IABSE Symposium on Resistance and Ultimate Deformability of structures,Lisbon,1973,15-22.
[10]潘强,方诗圣,程晓东.高墩大跨连续刚构桥地震反应的行波效应研究[J].湖南工程学院学报,2010,20(2):82-85.
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