曲线预应力连续宽体箱梁桥整体顶升改造前后地震反应对比分析
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摘要
由于曲线梁桥地震反应的复杂性和特殊性导致其在地震中易损坏,顶升改造后地震反应的改变直接影响桥梁的使用安全及寿命.以厦门市仙岳路桥梁顶升改造工程为背景,运用桥梁结构分析程序Midas,根据曲线梁桥的特点建立空间有限元模型,采用动态时程分析法对桥梁顶升改造前后进行地震反应分析,并研究了曲线梁桥桥墩墩高变化时的水平和竖向最不利地震反应.分析结果表明,曲线宽体连续梁桥支座中心连线方向和平面内与之垂直的方向为最不利的水平地震输入方向,而且改造后墩高的变化会引起桥梁尤其是桥墩处内力的明显变化,分析结果为同类桥梁结构的抗震设计提供理论依据.
Because of the complexity and particularity of seismic response of curved girder bridge,it is easy to be damaged in the earthquake.The change of seismic response will directly affect the bridge's safe use and life after jack-up transformation.On the basis of the bridge lift-up transformation in Xiamen Xianyue Road,and by using the bridge structural analysis programs Midas,a finite element model is established according to the characteristics of curve beam bridge.The dynamic time-history analysis method is used to analyze the critical seismic response of the bridge lift-up before and after transformation,and study the critical seismic response on horizontal and vertical curved beam bridge while the height of bridge pier changes.The results indicate that the center line direction of curved girder bridge bearing and the perpendicular direction in the plane are the unfavorbale input directions of horizontal seismic shock.Moreover,changes in the pier height can cause the obvious change of the inner force of bridge especially in the pier.The results from the present study may serve as a reference base for seismic design of the same bridge structure.
Because of the complexity and particularity of seismic response of curved girder bridge,it is easy to be damaged in the earthquake.The change of seismic response will directly affect the bridge's safe use and life after jack-up transformation.On the basis of the bridge lift-up transformation in Xiamen Xianyue Road,and by using the bridge structural analysis programs Midas,a finite element model is established according to the characteristics of curve beam bridge.The dynamic time-history analysis method is used to analyze the critical seismic response of the bridge lift-up before and after transformation,and study the critical seismic response on horizontal and vertical curved beam bridge while the height of bridge pier changes.The results indicate that the center line direction of curved girder bridge bearing and the perpendicular direction in the plane are the unfavorbale input directions of horizontal seismic shock.Moreover,changes in the pier height can cause the obvious change of the inner force of bridge especially in the pier.The results from the present study may serve as a reference base for seismic design of the same bridge structure.
引文
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[2]夏洪波,刘世忠,刘志翁,等.单箱五室连续弯箱梁桥旋转的顶升关键技术[J].兰州交通大学学报,2012,31(4):36-40.
[3]王佳,刘世忠.顶升技术在钢管混凝土拱桥改造工程中的应用[J].兰州交通大学学报,2008,27(1):17-20.
[4]中华人民共和国交通运输部.JTG/TB 02-01-2008,公路桥梁抗震设计细则[S].北京:人民交通出版社.2008.9.
[5]朱东生,刘世忠,虞庐松.曲线桥地震反应研究[J].中国公路学报,2002,15(3):42-48.
[6]肖卓,赵青.曲线梁桥的地震反应分析[J].工程抗震与加固改造,2009,31(3):9-15.
[7]陈兴冲,侯文杰,张跃进,等.曲率半径对城市曲线桥梁地震反应的影响[J].世界地震工程,2012,28(3):4348.
[8]王宏辉,王凤莲,刘德福.采用顶升工艺整体加高整体式连续箱梁[J].黑龙江交通科技,2004(12):52-54.
[9]王克海.桥梁抗震研究[M].北京:中国铁道出版社,2007:216-255.
[10]中华人民共和国住房和城乡建设部.GB 500112010,建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[11]范立础,卓卫东.桥梁延性抗震设计[M].北京:人民交通出版社,2001:9-11.
[12]贾贤盛.不同墩高桥墩结构的地震反应分析[J].交通科技,2011(4):8-10.
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