营口辽河公路大桥抗震性能研究
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摘要
以营口辽河公路大桥为背景,对斜拉桥的抗震性能进行研究。从斜拉桥的抗震分析方法和动力分析模型入手,研究斜拉桥的结构动力特性,用斜拉桥地震响应的反应谱法和时程积分法分析计算。动力特性分析结果表明初始索力和重力对结构的动力特性的计算结果影响很小。对于大跨度斜拉桥至少取前30个振型进行反应谱分析才合理。在3个方向的地震作用下,采用反应谱法计算,斜拉索的地震力较小,静内力加动内力均小于索的设计值,索始终保持弹性工作,且无松弛现象。以全飘体系顺桥向+竖向输入地震波进行时程分析,计算出塔根部支座反力、辅助墩及边墩支座反力、节点位移最值、拉索单元轴力最大值,并绘出顺桥向和竖向EL-centro地震波时间历程曲线图。
By Taking Liaohe River Highway Bridge in Yingkou as the background,the earthquake resistance performance of cable-stayed bridges was analysed.Based on antiseismic analytical method and dynamic analytic model,the structural dynamic characteristics of cable-stayed bridge were studied by using response spectrum method and time history integration method.The analytical result shows that(1)initial cable force and gravity have little effect on the evaluation of the structural dynamic characteristics;(2) the first 30 vibration modes should be analysed at least with response spectrum method for long-span cable-stayed bridge;(3) under earthquake action in three directions,the earthquake force of cable is small and the static/dynamic internal forces are smaller than the designed values of cable based on response spectrum method,which enable the cable always keeps elasticity without slack.By means of time history analysis of lengthways and vertical earthquake wave input in full floating system,the support reactions of foundation,auxiliary pier and side pier,the maximum and minimum of nodal displacement,the maximum of axial force were calculated and draws the time history curve of lengthways and vertical EL-centro earthquake wave input were drawn.
By Taking Liaohe River Highway Bridge in Yingkou as the background,the earthquake resistance performance of cable-stayed bridges was analysed.Based on antiseismic analytical method and dynamic analytic model,the structural dynamic characteristics of cable-stayed bridge were studied by using response spectrum method and time history integration method.The analytical result shows that(1)initial cable force and gravity have little effect on the evaluation of the structural dynamic characteristics;(2) the first 30 vibration modes should be analysed at least with response spectrum method for long-span cable-stayed bridge;(3) under earthquake action in three directions,the earthquake force of cable is small and the static/dynamic internal forces are smaller than the designed values of cable based on response spectrum method,which enable the cable always keeps elasticity without slack.By means of time history analysis of lengthways and vertical earthquake wave input in full floating system,the support reactions of foundation,auxiliary pier and side pier,the maximum and minimum of nodal displacement,the maximum of axial force were calculated and draws the time history curve of lengthways and vertical EL-centro earthquake wave input were drawn.
引文
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[7]亓兴军,李小军,李美玲.设置粘滞阻尼器的大跨斜拉桥抗震分析[J].铁道建筑,2007(1):1-3.QI Xingjun,LI Xiaojun,LI Meiling.Earthquake ResistanceAnalysis on the Long-span Cable-stayed Bridge with ViscousDamper[J].Railway Engineering,2007(1):1-3.
[8]肖光宏,张秋陵,黄明海.几何非线性对大跨斜拉桥稳定性的影响[J].重庆交通学院学报,2007,26(3):17-19.XIAO Guanghong,ZHANG Qiuling,HUANG Minghai.Infl-uences of the Geometric Nonlinear on the Stability of Long-spanCable-stayed Bridges[J].Journal of Chongqing JiaotongUniversity,2007,26(3):17-19.
[9]杨兴旺,赵雷.高速铁路大跨度斜拉桥稳定性分析[J].铁道建筑,2005(6):16-19.YANG Xingwang,ZHAO Lei.Analysis on the Stability of Long-span Cable-stayed Railway Bridge[J].Railway Engineering,2005(6):16-19.
[10]贺丽丽,肖盛燮,臧登科.基于AHP和模糊理论的斜拉桥稳定性评价[J].重庆交通大学学报:自然科学版,2007,26(6):33-37.HE Lili,XIAO Shengxie,ZANG Dengke.Evaluation on theStability of Cable-stayedBridge Based on AHP and Fuzzy Theory[J].Journal of Chongqing Jiaotong University:Nature Sci-ence,2007,26(6):33-37.
[11]谢旭,阙仁波,张鹤,等.有效弹性模量法在大跨斜拉桥稳定计算中的应用[J].浙江大学学报:工学版,2006,40(10):1761-1767.XIE Xu,QUE Renbo,ZHANG He,et al.Applicability ofEffective Tangent Modulus Method in Evaluation of BucklingStrength of Long-span Cable-stayed Bridges[J].Journal ofZhengjiang University:Engineering Science,2006,40(10):1761-1767.
[12]曹海滨.大跨度混合梁斜拉桥抗风性能分析[J].铁道标准设计,2005(10):36-38.CAO Haibin.Analysis on the Anti-wind Performance of the Ca-ble-stayed Bridge with Large-span Composite Beams[J].Rail-way Standard Design,2005(10):36-38.
[2]包立新,李小珍,卫星,等.宜宾长江公路大桥斜拉桥抗震性能评价[J].工程力学,2008,25(2):174-182.BAO Lixin,LI Xiaozhen,WEI Xing,et al.Evaluation on theEarthquake Resistance Performance of Yibin Yangtze RiverHighway Cable-stayed Bridge[J].Engineering Mechanics,2008,25(2):174-182.
[3]沙培洲.独塔双索面斜拉桥抗震及抗风稳定性分析[J].科技交流,2006(3):52-57.SHA Peizhou.Analysis on the Earthquake and Wind ResistancePerformance of Cable-stayed Bridge with Single Pylon and Dou-ble Cables[J].Science and Technology Communion,2006(3):52-57.
[4]马坤全,王志平.大跨度铁路斜拉桥抗震性能研究[J].铁道标准设计,2005(4):47-52.MA Kunquan,WANG Zhiping.Research on the EarthquakeResistance Performance of Long-span Railway Cable-stayedBridge[J].Railway Standard Design,2005(4):47-52.
[5]王策,刘西拉,辛克贵,等.大佛寺斜拉桥抗震性能及稳定分析[J].工程力学,2000,17(增刊):14-23.WANG Ce,LIU Xila,XIN Kegui,et al.Analysis on the EarthquakeResistance Performance and Stability of Dafosi Cable-stayed Bridge[J].Engineering Mechanics,2000,17(Sup):14-23.
[6]杜国林,张立忱,欧阳兆国,等.松花江斜拉桥抗震性能评价[J].东北地震研究,2005(12):56-65.DU Guolin,ZHANG Lichen,OUYANG Zhaoguo,et al.Ev-aluation on the Earthquake Resistance Performance of SonghuaRiver Cable-stayed Bridge[J].Seismological Research ofNortheast China,2005(12):56-65.(下转第108页)
[7]亓兴军,李小军,李美玲.设置粘滞阻尼器的大跨斜拉桥抗震分析[J].铁道建筑,2007(1):1-3.QI Xingjun,LI Xiaojun,LI Meiling.Earthquake ResistanceAnalysis on the Long-span Cable-stayed Bridge with ViscousDamper[J].Railway Engineering,2007(1):1-3.
[8]肖光宏,张秋陵,黄明海.几何非线性对大跨斜拉桥稳定性的影响[J].重庆交通学院学报,2007,26(3):17-19.XIAO Guanghong,ZHANG Qiuling,HUANG Minghai.Infl-uences of the Geometric Nonlinear on the Stability of Long-spanCable-stayed Bridges[J].Journal of Chongqing JiaotongUniversity,2007,26(3):17-19.
[9]杨兴旺,赵雷.高速铁路大跨度斜拉桥稳定性分析[J].铁道建筑,2005(6):16-19.YANG Xingwang,ZHAO Lei.Analysis on the Stability of Long-span Cable-stayed Railway Bridge[J].Railway Engineering,2005(6):16-19.
[10]贺丽丽,肖盛燮,臧登科.基于AHP和模糊理论的斜拉桥稳定性评价[J].重庆交通大学学报:自然科学版,2007,26(6):33-37.HE Lili,XIAO Shengxie,ZANG Dengke.Evaluation on theStability of Cable-stayedBridge Based on AHP and Fuzzy Theory[J].Journal of Chongqing Jiaotong University:Nature Sci-ence,2007,26(6):33-37.
[11]谢旭,阙仁波,张鹤,等.有效弹性模量法在大跨斜拉桥稳定计算中的应用[J].浙江大学学报:工学版,2006,40(10):1761-1767.XIE Xu,QUE Renbo,ZHANG He,et al.Applicability ofEffective Tangent Modulus Method in Evaluation of BucklingStrength of Long-span Cable-stayed Bridges[J].Journal ofZhengjiang University:Engineering Science,2006,40(10):1761-1767.
[12]曹海滨.大跨度混合梁斜拉桥抗风性能分析[J].铁道标准设计,2005(10):36-38.CAO Haibin.Analysis on the Anti-wind Performance of the Ca-ble-stayed Bridge with Large-span Composite Beams[J].Rail-way Standard Design,2005(10):36-38.
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