新型抗震挡块的抗震性能
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摘要
为了降低桥梁在地震作用下梁体与抗震挡块间的碰撞效应,设计了一种新型滑移型抗震挡块.该挡块中设置有一人为薄弱层,且挡块顶部有一个外突起.地震时梁体先与外突起发生碰撞,当撞击达到一定的强度时,挡块在薄弱层处发生滑动,梁体继而与滑动面以下的挡块发生二次碰撞.采用接触单元法建立桥梁横向碰撞分析模型,并利用SAP2000建立一连续梁桥,然后采用非线性时程分析法对比分析了新型挡块和普通挡块的抗震性能.结果表明,新型挡块的碰撞撞击力明显小于普通挡块,其原因在于新型挡块通过滑移耗能降低了地震反应,而且它与主梁发生的2次碰撞可分散了撞击力,降低了横向碰撞引起的最大撞击力.
In order to reduce the pounding effect of bridges between a girder and a side retainer under earthquake,a new slipping side retainer is designed.A man-made weak layer is set in the middle of the new side retainer,and a protuberance is also designed on the top.Under earthquake,the protuberance pounds with the girder firstly.When the pounding reaches a certain intensity,the retainer slips in the weak layer.Then the second pounding happens between the girder and the retainer under the slipping surface.A pounding model is established by using the contacting unit and a model of a continuous girder bridge is accomplished by SAP2000.The comparison of seismic performance between the new retainer and an ordinary retainer is made by the nonlinear time-history integration method.The results show that the pounding force of the new retainer is obviously less than that of an ordinary retainer.This is because that the new retainer can dissipate energy through slipping to reduce the responses,and it can even lead a second pounding to disperse the energy and reduce the peak pounding force.
In order to reduce the pounding effect of bridges between a girder and a side retainer under earthquake,a new slipping side retainer is designed.A man-made weak layer is set in the middle of the new side retainer,and a protuberance is also designed on the top.Under earthquake,the protuberance pounds with the girder firstly.When the pounding reaches a certain intensity,the retainer slips in the weak layer.Then the second pounding happens between the girder and the retainer under the slipping surface.A pounding model is established by using the contacting unit and a model of a continuous girder bridge is accomplished by SAP2000.The comparison of seismic performance between the new retainer and an ordinary retainer is made by the nonlinear time-history integration method.The results show that the pounding force of the new retainer is obviously less than that of an ordinary retainer.This is because that the new retainer can dissipate energy through slipping to reduce the responses,and it can even lead a second pounding to disperse the energy and reduce the peak pounding force.
引文
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[6]朱文正,刘建新.圆筒型缓冲装置设计方法研究[J].公路交通科技,2006,23(12):102-105.Zhu Wenzheng,Liu Jianxin.Research on design method of cylinder bumper device[J].Journal of Highway andTransportation Research and Development,2006,23(12):102-105.(in Chinese)
[2]Maleki Shervin.Effect of side retainers on seismic response of bridges with elastomeric bearings[J].Journal of bridgeengineering,2004,9(1):95-100.
[3]Maleki Shervin.Seismic modeling of skewed bridges with elastomeric bearing and side retainers[J].Journal of bridgeEngineering,2005,10(4):422-449.
[4]邓育林,彭天波,李建中.地震作用下桥梁结构横向碰撞模型及参数分析[J].振动与冲击,2007,26(9):104-106.Deng Yulin,Peng Tianbo,Li Jianzhong.Pounding model of bridge structures and parameter analysis under transverseearthquakes[J].Journal of Vibration and Shock,2007,26(9):104-106.(in Chinese)
[5]邓育林,彭凯,李建中.地震作用下横向碰撞对连续梁桥地震反应的影响[J].结构工程师,2007,23(2):64-68.Deng Yulin,Peng Kai,Li Jianzhong.Effect of pounding on seismic responses of continuous girder bridges under transverseearthquake[J].Structural Engineers,2007,23(2):64-68.(in Chinese)
[6]朱文正,刘建新.圆筒型缓冲装置设计方法研究[J].公路交通科技,2006,23(12):102-105.Zhu Wenzheng,Liu Jianxin.Research on design method of cylinder bumper device[J].Journal of Highway andTransportation Research and Development,2006,23(12):102-105.(in Chinese)
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