双薄壁墩间距对连续刚构桥地震响应的影响
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摘要
为了研究桥墩布置形式对连续刚构桥地震响应的影响,以某弯连续刚构桥为例,采用通用有限元程序分析了5种不同的双薄壁墩间距对桥梁结构自振频率的影响,选取桥位场地人工合成地震波,对其进行了弹性地震响应分析。分析结果表明:当双薄壁墩间距在主跨径的1/20～1/25之间变化时,结构基频变化不超过5%,在地震作用下,主梁的弯矩、墩底弯矩及主梁位移最大变化不会超过12%,说明薄壁墩间距对结构自振频率及地震响应的影响不大,在初步设计阶段或进行弹性地震响应分析时,如果双薄壁间距在以上范围内变化,可以不考虑它对结构动力性能的影响。
In order to study the effect of pier's layout on the seisimic response of continuous rigid frame bridge,a curved rigid frame bridge was taken as an example,the natural frequencies of the bridge under five double-thin-wall distances were analyzed by finite element procedure,and artificial earthquake wave was employed to compute the elastic seismic response of the bridge.The result shows that when double-thin-wall distance lies between 1/20 and 1/25 of main span,the change of fundamental frequency is not more than 5%,and the seismic responses of the moments of girder and pier and the displacement of the superstructure are not more than 12%,which indicates that the natural frequencies and the seismic response of the structure are not sensitive to double-thin-wall distance.So during the period of primary design,the effect of double-thin-wall distance on the dynamic performance of continuous rigid frame bridge can be neglected if the bridge has ordinary double-thin-wall distance.3 tabs,6 figs,10 refs.
In order to study the effect of pier's layout on the seisimic response of continuous rigid frame bridge,a curved rigid frame bridge was taken as an example,the natural frequencies of the bridge under five double-thin-wall distances were analyzed by finite element procedure,and artificial earthquake wave was employed to compute the elastic seismic response of the bridge.The result shows that when double-thin-wall distance lies between 1/20 and 1/25 of main span,the change of fundamental frequency is not more than 5%,and the seismic responses of the moments of girder and pier and the displacement of the superstructure are not more than 12%,which indicates that the natural frequencies and the seismic response of the structure are not sensitive to double-thin-wall distance.So during the period of primary design,the effect of double-thin-wall distance on the dynamic performance of continuous rigid frame bridge can be neglected if the bridge has ordinary double-thin-wall distance.3 tabs,6 figs,10 refs.
引文
[1]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.HUANG Xiao-guo,HU Da-lin,ZHANG Hou-ju.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.(in Chinese)
[2]胡大琳,黄小国,赵国辉,等.考虑结构-水相互作用的连续刚构桥水平地震反应分析[J].建筑科学与工程学报,2008,25(2):79-84.HU Da-lin,HUANG Xiao-guo,ZHAO Guo-hui,et al.Hori-zontal seismic response analysis of continuous rigid frame bridges considering structure-water interaction[J].Journal of Architecture and Civil Engineering,2008,25(2):79-84.(in Chinese)
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[4]周绪红,戴鹏,狄谨.曲线PC箱梁桥隔震体系的非线性分析[J].中国公路学报,2008,21(1):65-71.ZHOU Xu-hong,DAI Peng,DI Jin.Nonlinear analysis of curved prestressed concrete box girder bridge with seismic isolation system[J].China Journal of Highway and Trans-port,2008,21(1):65-71.(in Chinese)
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[6]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 Qin-xiang,TI AN Xiao-hong,SONG Dan.A seismatic performance evaluation of a long-span continuous rigid frame bridge with tall piers[J].Journal of Vibration and Shock,2009,28(1):68-71.(in Chinese)
[7]郑凯锋,文曙东,栗怀广.弹塑性连接梁在双薄壁高墩连续刚构桥中的应用[J].西北地震学报,2007,29(4):303-306.ZHENG Kai-feng,WENShu-dong,LI Huai-guang.Applica-tion of inelastic beams on double thin-wall high piers of con-tinuous rigid frame bridge[J].Northwestern Seismological Journal,2007,29(4):303-306.(in Chinese)
[8]周勇军,贺拴海,张岗,等.桥墩截面形式对弯连续刚构桥地震响应的影响[J].公路交通科技,2009,26(2):68-72.ZHOU Yong-jun,HE Shuan-hai,ZHANG Gang,et al.Effect of pier section type on seismic response of curved con-tinuous rigid frame bridge[J].Journal of Highway and Transportation Research and Development,2009,26(2):68-72.(in Chinese)
[9]周勇军,贺拴海,宋一凡,等.连续刚构桥单双薄壁墩地震响应的对比分析[J].中外公路,2007,27(3):114-117.ZHOU Yong-jun,HE Shuan-hai,SONG Yi-fan,et al.Con-trast analysis for seismic response of continuous rigid frame bridge with single or double-thin-wall[J].Journal of China and Foreign Highway,2007,27(3):114-117.(in Chinese)
[10]MANEETES H,LINZELL D G.Cross-frame andlateral bracing influence on curved steel bridge free vibration response[J].Journal of Constructional Steel Research,2003,59(9):1101-1117.
[2]胡大琳,黄小国,赵国辉,等.考虑结构-水相互作用的连续刚构桥水平地震反应分析[J].建筑科学与工程学报,2008,25(2):79-84.HU Da-lin,HUANG Xiao-guo,ZHAO Guo-hui,et al.Hori-zontal seismic response analysis of continuous rigid frame bridges considering structure-water interaction[J].Journal of Architecture and Civil Engineering,2008,25(2):79-84.(in Chinese)
[3]王统宁,刘健新,于泳波.近断层地震动作用下减隔震桥梁空间动力分析[J].交通运输工程学报,2009,9(5):20-25,31.WANG Tong-ning,LI U Jian-xin,YU Yong-bo.Spatial dynamic analysis of isolated bridges subjected to near-fault ground motion[J].Journal of Traffic and Transportation Engineering,2009,9(5):20-25,31.(in Chinese)
[4]周绪红,戴鹏,狄谨.曲线PC箱梁桥隔震体系的非线性分析[J].中国公路学报,2008,21(1):65-71.ZHOU Xu-hong,DAI Peng,DI Jin.Nonlinear analysis of curved prestressed concrete box girder bridge with seismic isolation system[J].China Journal of Highway and Trans-port,2008,21(1):65-71.(in Chinese)
[5]谢肖礼,王波,张伟峰,等.罕遇地震作用下高墩连续刚构桥双重非线性抗震分析[J].工程力学,2009,26(4):113-118,127.XIE Xiao-li,WANG Bo,ZHANG Wei-feng,et al.Double nonlinear seismic analysis of high-rise pier and rigid frame bridges under rare earthquake[J].Engineering Mechanics,2009,26(4):113-118,127.(in Chinese)
[6]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 Qin-xiang,TI AN Xiao-hong,SONG Dan.A seismatic performance evaluation of a long-span continuous rigid frame bridge with tall piers[J].Journal of Vibration and Shock,2009,28(1):68-71.(in Chinese)
[7]郑凯锋,文曙东,栗怀广.弹塑性连接梁在双薄壁高墩连续刚构桥中的应用[J].西北地震学报,2007,29(4):303-306.ZHENG Kai-feng,WENShu-dong,LI Huai-guang.Applica-tion of inelastic beams on double thin-wall high piers of con-tinuous rigid frame bridge[J].Northwestern Seismological Journal,2007,29(4):303-306.(in Chinese)
[8]周勇军,贺拴海,张岗,等.桥墩截面形式对弯连续刚构桥地震响应的影响[J].公路交通科技,2009,26(2):68-72.ZHOU Yong-jun,HE Shuan-hai,ZHANG Gang,et al.Effect of pier section type on seismic response of curved con-tinuous rigid frame bridge[J].Journal of Highway and Transportation Research and Development,2009,26(2):68-72.(in Chinese)
[9]周勇军,贺拴海,宋一凡,等.连续刚构桥单双薄壁墩地震响应的对比分析[J].中外公路,2007,27(3):114-117.ZHOU Yong-jun,HE Shuan-hai,SONG Yi-fan,et al.Con-trast analysis for seismic response of continuous rigid frame bridge with single or double-thin-wall[J].Journal of China and Foreign Highway,2007,27(3):114-117.(in Chinese)
[10]MANEETES H,LINZELL D G.Cross-frame andlateral bracing influence on curved steel bridge free vibration response[J].Journal of Constructional Steel Research,2003,59(9):1101-1117.
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