高墩大跨曲线连续刚构桥地震响应研究
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摘要
目的研究桩土相互作用和行波效应对高墩大跨曲线连续刚构桥地震响应的影响.方法采用有限元程序,建立跨度为(70+3×127+70) m的曲线刚构桥有限元模型,采用动态时程分析方法,分析了桩土相互作用和行波效应在不同参数取值下的桥梁结构地震响应.结果纵桥向激励下,考虑桩土相互作用比不考虑桩土相互作用桥梁各桥墩控制截面内力增大30%～40%;横桥向激励下,考虑桩土相互作用比不考虑桩土相互作用桥梁各桥墩控制截面内力减小17%～25%.考虑桩土相互作用,将显著增大墩顶和墩底截面纵桥向内力,减小横桥向墩顶和墩底内力;考虑地震波传播速度引起的行波效应,使得桥墩内力在不同桥墩之间呈现更加不均匀分布状态,增大部分桥墩破坏的危险;由于地震波入射角度不同而引起的行波效应时,入射角度为0°时各个桥墩内力和位移响应略大于10°和-10°两个入射角度的激励结果.结论地震波入射角度引起的行波效应时对该类桥型地震响应影响较小.桩土相互作用对该类桥型的动力特性有一定的影响.随着桩土弹性连接土介质参数的增大,结构体系的自振频率也随之增大,但结构的低阶振型基本未变.
This paper aims at the seismic response of high pier and long-span curved continuous rigid frame bridge influenced by the pile-soil interaction and traveling wave effect. A curved rigid frame bridge with a span of( 70 + 3 × 127 + 70) m was simulated by a finite element program,and the bridge seismic response under different parameters of pile-soil interaction and traveling wavewere analyzed by using dynamic time history analysis method. Under longitudinal bridge excitation,the internal force of the control section of each bridge pier with considering the interaction between pile and soil is 30% ～ 40% higher than that of no-considering interaction between pile and soil; Under the cross-bridge excitation,the internal force of the bridge cross section of the bridge with considering the interaction between pile and soil is 17% ～ 25% less than that of no-considering interaction between pile and soil. The pile-soil interaction can enlarge the internal force of top and bottom of the pier along the direction of the bridge and decrease the internal force along the transverse direction of the bridge. The traveling wave effect with considering the seismic wave propagation velocity can make the internal force of the bridge pier more uneven distribution in different piers,and increases the risk of damage to part of the pier; considering the traveling wave effect caused by seismic wave incident angle,the internal force and displacement of the bridge pier with incident angle 0 degree are slightly larger than that of the two other incident angle 10 degree and-10 degree. The traveling wave effect caused by the incident angle of seismic waves has little effect on the seismic response of this type of bridge. Pile-soil interaction has a certain influence on the dynamic characteristics of this type of bridge. With the increase of the media parameters of the elastic soil of the pile-soil,the natural vibration frequency of the structural system also increases,but the low-order vibration mode of the structure remains basically unchanged.
This paper aims at the seismic response of high pier and long-span curved continuous rigid frame bridge influenced by the pile-soil interaction and traveling wave effect. A curved rigid frame bridge with a span of( 70 + 3 × 127 + 70) m was simulated by a finite element program,and the bridge seismic response under different parameters of pile-soil interaction and traveling wavewere analyzed by using dynamic time history analysis method. Under longitudinal bridge excitation,the internal force of the control section of each bridge pier with considering the interaction between pile and soil is 30% ～ 40% higher than that of no-considering interaction between pile and soil; Under the cross-bridge excitation,the internal force of the bridge cross section of the bridge with considering the interaction between pile and soil is 17% ～ 25% less than that of no-considering interaction between pile and soil. The pile-soil interaction can enlarge the internal force of top and bottom of the pier along the direction of the bridge and decrease the internal force along the transverse direction of the bridge. The traveling wave effect with considering the seismic wave propagation velocity can make the internal force of the bridge pier more uneven distribution in different piers,and increases the risk of damage to part of the pier; considering the traveling wave effect caused by seismic wave incident angle,the internal force and displacement of the bridge pier with incident angle 0 degree are slightly larger than that of the two other incident angle 10 degree and-10 degree. The traveling wave effect caused by the incident angle of seismic waves has little effect on the seismic response of this type of bridge. Pile-soil interaction has a certain influence on the dynamic characteristics of this type of bridge. With the increase of the media parameters of the elastic soil of the pile-soil,the natural vibration frequency of the structural system also increases,but the low-order vibration mode of the structure remains basically unchanged.
引文
[1]张永亮,陈兴冲,夏修身.行波效应对铁路大跨连续刚构桥地震反应的影响[J].西北地震学报,2010,32(3):268-272.(ZHANGYongliang,CHEN Xingchong,XIA Xiushen. The excitation effect of traveling waves on seismic response of railway long-span continuous rigid-frame bridge[J]. North western seismological journal,2010,32(3):268-272.)
[2]贾毅.高墩大跨曲线连续刚构桥地震响应分析[D].昆明:云南大学,2014.(JIA Yi. Seismic response analysis of high pier and long-span curve continuous rigid frame bridge[D]. Kunming:Yunnan University,2014.)
[3]李永波,张鸿儒,郜新军.考虑桩-土相互作用的多年冻土区多跨简支梁桥地震响应分析[J].工程力学,2012,29(11):183-190.(LI Yongbo,ZHANGHongru,GAO Xingjun.Seismic response analysis of MSSS bridge in permafrost including pile-soil interaction[J].Engineering mechanics,2012,29(11):183-190.)
[4]陈清军,姜文辉,李哲明.桩-土接触效应及对桥梁结构地震反应的影响[J].力学季刊,2005,26(4):609-613.(CHEN Qingjun,JIANGWenhui,LI Zheming. Effect of pile soil contact and its influence on seismic response of bridge structure[J].Chinese quarterly of mechanics,2005,26(4):609-613.)
[5]魏凯,郭平,韩萍,等.行波效应下多联长跨组合结构桥梁地震响应分析[J].结构工程师,2010,26(2):119-125.(WEI Kai,GUO Ping,HAN Ping,et al. Seismic responses of a long multi-span composite bridge under traveling wave excitation[J].Structural engineers,2010,26(2):119-125.)
[6]洪浩,郑史雄,贾宏宇,等.考虑行波效应的高墩大跨刚构桥随机地震动响应研究[J].世界地震工程,2013,29(2):132-137.(HONGHao,ZHENGShixiong,JIA Hongyu,et al. Stochastic seismic responses analysis of long-span rigid-framed bridge with high piers considering travelling wave effect[J]. World earthquake engineering,2013,29(2):132-137.)
[7]高月琪.基于行波效应的大跨度钢-混凝土组合拱桥地震响应分析[J].公路交通技术,2015,1(1):45-50.(GAO Yueqi. Analysis for seismic response of large-span steel-concrete combined arch bridge based on traveling wave effect[J]. Technology of highway and transport,2015,1(1):45-50.)
[8]李小珍,洪沁烨,雷虎军,等.地震动输入方向对铁路部分斜拉桥地震响应的影响[J].桥梁建设,2015,45(1):26-32.(LI Xiaozhen,HONGQinye,LEI Hujun,et al.Effect of input directions of seismic ground motion on seismic responses of a railway extradosed bridge[J]. Bridge construction,2015,45(1):26-32.)
[9]揭志羽,卫星,李亚东,等.大跨高墩小半径刚构-连续组合梁桥地震响应分析[J].桥梁建设,2013,43(1):52-58.(JIE Zhiyu,WEI Xin,LI Yadong,et al. Analysis of seismic response of long span,high-rise pier and short radius curved hybrid bridge of rigid frame and continuous girder[J]. Bridge construction,2013,43(1):52-58.)
[10]黄小国,胡大琳,张后举.行波效应对大跨度连续刚构桥地震反应的影响[J].长安大学学报(自然科学版),2008,28(1):72-76.(HUANGXiaoguo,HU Dalin,ZHANGHouju. Effects of traveling wave to seismic response of long span rigid-framed bridge[J].Journal of Chang'an university(natural science edition),2008,28(1):72-76.)
[11]李忠献,史志利.行波激励下大跨度连续刚构桥的地震反应分析[J].地震工程与工程振动,2003,23(2):68-76.(LI Zhongxian,SHI Zhili. Seismic response analysis for long-span continuous rigid-framed bridge under excitation of traveling waves[J].Earthquake engineering and engineering vibration,2003,23(2):68-76.)
[12] HARICHANDRAN R S,HAWWARI A,SWEIDAN B N. Response of long-span bridges to spatially varying ground motion[J]. Journal of structural engineering,1996,122(122):476-484.
[13] SOYLUK K,DUMANOGLU A A. Comparison of asynchronous and stochastic dynamic responses of a cable-stayed bridges[J]. Engineering structures,2000,22(5):435-445.
[14]李忠献,黄信.行波效应对深水连续刚构桥地震响应的影响[J].工程力学,2013,30(3):120-125.(LI Zhongxian,HUANGXin. Influence of traveling wave effect on seismic responses of continuous rigid-framed bridge in deep water[J]. Engineering mechanics,2013,30(3):120-125.)
[15]贾毅,李福海,赵人达,等.曲率半径和激励角度对刚构桥地震响应的影响[J].沈阳建筑大学学报(自然科学版),2017,33(2):243-250.(JIA Yi,LI Fuhai,ZHAO Renda,et al. Study on the effect of the curvature radius and seismic excitation angle on the seismic responses of high pier and long-span continuous rigid frame bridge[J]. Journal of Shenyang jianzhu university(natural science),2017,33(2):243-250.)
[16]代攀,杨涛,胡大琳.高墩大跨曲线连续刚构桥地震响应分析[J].世界地震工程,2009,25(4):181-187.(DAI Pan,YANGTao,HU Dalin. The seismic response analysis of continuous rigid frame bridge with high piers and long span[J].World earthquake engineering,2009,25(4):181-187.)
[17]胡明刚.曲线梁桥的动力分析及抗震性能研究[D].成都:西南交通大学,2010.(HU Minggang. Dynamic and seismic behavior researches on curved girder bridges[D].Chengdu:Southwest Jiaotong University,2010.)
[2]贾毅.高墩大跨曲线连续刚构桥地震响应分析[D].昆明:云南大学,2014.(JIA Yi. Seismic response analysis of high pier and long-span curve continuous rigid frame bridge[D]. Kunming:Yunnan University,2014.)
[3]李永波,张鸿儒,郜新军.考虑桩-土相互作用的多年冻土区多跨简支梁桥地震响应分析[J].工程力学,2012,29(11):183-190.(LI Yongbo,ZHANGHongru,GAO Xingjun.Seismic response analysis of MSSS bridge in permafrost including pile-soil interaction[J].Engineering mechanics,2012,29(11):183-190.)
[4]陈清军,姜文辉,李哲明.桩-土接触效应及对桥梁结构地震反应的影响[J].力学季刊,2005,26(4):609-613.(CHEN Qingjun,JIANGWenhui,LI Zheming. Effect of pile soil contact and its influence on seismic response of bridge structure[J].Chinese quarterly of mechanics,2005,26(4):609-613.)
[5]魏凯,郭平,韩萍,等.行波效应下多联长跨组合结构桥梁地震响应分析[J].结构工程师,2010,26(2):119-125.(WEI Kai,GUO Ping,HAN Ping,et al. Seismic responses of a long multi-span composite bridge under traveling wave excitation[J].Structural engineers,2010,26(2):119-125.)
[6]洪浩,郑史雄,贾宏宇,等.考虑行波效应的高墩大跨刚构桥随机地震动响应研究[J].世界地震工程,2013,29(2):132-137.(HONGHao,ZHENGShixiong,JIA Hongyu,et al. Stochastic seismic responses analysis of long-span rigid-framed bridge with high piers considering travelling wave effect[J]. World earthquake engineering,2013,29(2):132-137.)
[7]高月琪.基于行波效应的大跨度钢-混凝土组合拱桥地震响应分析[J].公路交通技术,2015,1(1):45-50.(GAO Yueqi. Analysis for seismic response of large-span steel-concrete combined arch bridge based on traveling wave effect[J]. Technology of highway and transport,2015,1(1):45-50.)
[8]李小珍,洪沁烨,雷虎军,等.地震动输入方向对铁路部分斜拉桥地震响应的影响[J].桥梁建设,2015,45(1):26-32.(LI Xiaozhen,HONGQinye,LEI Hujun,et al.Effect of input directions of seismic ground motion on seismic responses of a railway extradosed bridge[J]. Bridge construction,2015,45(1):26-32.)
[9]揭志羽,卫星,李亚东,等.大跨高墩小半径刚构-连续组合梁桥地震响应分析[J].桥梁建设,2013,43(1):52-58.(JIE Zhiyu,WEI Xin,LI Yadong,et al. Analysis of seismic response of long span,high-rise pier and short radius curved hybrid bridge of rigid frame and continuous girder[J]. Bridge construction,2013,43(1):52-58.)
[10]黄小国,胡大琳,张后举.行波效应对大跨度连续刚构桥地震反应的影响[J].长安大学学报(自然科学版),2008,28(1):72-76.(HUANGXiaoguo,HU Dalin,ZHANGHouju. Effects of traveling wave to seismic response of long span rigid-framed bridge[J].Journal of Chang'an university(natural science edition),2008,28(1):72-76.)
[11]李忠献,史志利.行波激励下大跨度连续刚构桥的地震反应分析[J].地震工程与工程振动,2003,23(2):68-76.(LI Zhongxian,SHI Zhili. Seismic response analysis for long-span continuous rigid-framed bridge under excitation of traveling waves[J].Earthquake engineering and engineering vibration,2003,23(2):68-76.)
[12] HARICHANDRAN R S,HAWWARI A,SWEIDAN B N. Response of long-span bridges to spatially varying ground motion[J]. Journal of structural engineering,1996,122(122):476-484.
[13] SOYLUK K,DUMANOGLU A A. Comparison of asynchronous and stochastic dynamic responses of a cable-stayed bridges[J]. Engineering structures,2000,22(5):435-445.
[14]李忠献,黄信.行波效应对深水连续刚构桥地震响应的影响[J].工程力学,2013,30(3):120-125.(LI Zhongxian,HUANGXin. Influence of traveling wave effect on seismic responses of continuous rigid-framed bridge in deep water[J]. Engineering mechanics,2013,30(3):120-125.)
[15]贾毅,李福海,赵人达,等.曲率半径和激励角度对刚构桥地震响应的影响[J].沈阳建筑大学学报(自然科学版),2017,33(2):243-250.(JIA Yi,LI Fuhai,ZHAO Renda,et al. Study on the effect of the curvature radius and seismic excitation angle on the seismic responses of high pier and long-span continuous rigid frame bridge[J]. Journal of Shenyang jianzhu university(natural science),2017,33(2):243-250.)
[16]代攀,杨涛,胡大琳.高墩大跨曲线连续刚构桥地震响应分析[J].世界地震工程,2009,25(4):181-187.(DAI Pan,YANGTao,HU Dalin. The seismic response analysis of continuous rigid frame bridge with high piers and long span[J].World earthquake engineering,2009,25(4):181-187.)
[17]胡明刚.曲线梁桥的动力分析及抗震性能研究[D].成都:西南交通大学,2010.(HU Minggang. Dynamic and seismic behavior researches on curved girder bridges[D].Chengdu:Southwest Jiaotong University,2010.)