板式橡胶支座曲线梁桥地震反应与参数影响分析
|
摘要
在地震中,曲线梁桥的反应较为复杂,容易发生碰撞甚至是落梁,板式橡胶支座经常会发生较大滑移,这种支座的滑移特性又会显著地改变曲线梁桥的动力反应。以某座板式橡胶支座曲线连续梁桥为研究对象,建立桥梁的多尺度有限元模型,通过非线性时程方法,分析了地震作用下曲线梁桥上部结构、支座和下部结构的动力反应。在此基础上,采用显式动力接触算法,模拟了主梁与桥台间的碰撞行为,并改变支座摩擦系数的取值,分别研究了梁端碰撞效应和板式橡胶支座摩擦系数对桥梁结构地震反应的影响。结果表明,由于曲线梁桥内、外侧支座竖向反力的差异,使得内侧板式橡胶支座较外侧支座更容易发生滑移,外侧桥墩受力明显较内侧桥墩复杂;碰撞作用降低了支座的抗滑能力,使得主梁端部位移和墩底内力都有所增大;支座的抗滑能力随着摩阻系数的增大而显著提高,摩阻系数和碰撞作用对桥墩扭矩的影响都较为显著。
The response of curved girder bridge is complicated during the earthquake.The upside bridge girders are often easily to pound with adjacent ones or abutments and even falling-off.The laminated rubber bearings usually slide on piers or abutments in earthquake,this behavior will significantly change the dynamic response of the bridge.In this paper,a curved girder bridge with laminated rubber bearings was taken for consideration and its multi-scale finite element model was established.The responses of bearings and the upper and lower part of bridge were analyzed by using nonlinear time history method.Based on the analysis,the impact behavior between the girder and abutment was simulated by dynamic explicit contact algorithm and the value of friction coefficient was varied to study the effects of pounding and friction on response of the bridge in the earthquake.The results indicate that,for the difference between vertical reaction force of bearings set inside and outside the curved bridge,the inside bearings slide more easily than the outside ones and the force state of outside pier is more complicated than that of inside pier one.The pounding effect reduces the bearing′s anti-sliding capacity and makes both the displacement at the end of the girder and internal force at the bottom of the pier larger.The bearing′s anti-sliding capacity strengthens significantly as the coefficient of friction improves.Both coefficient of friction and pounding effect have a great influence on the torsion moment of the piers.
The response of curved girder bridge is complicated during the earthquake.The upside bridge girders are often easily to pound with adjacent ones or abutments and even falling-off.The laminated rubber bearings usually slide on piers or abutments in earthquake,this behavior will significantly change the dynamic response of the bridge.In this paper,a curved girder bridge with laminated rubber bearings was taken for consideration and its multi-scale finite element model was established.The responses of bearings and the upper and lower part of bridge were analyzed by using nonlinear time history method.Based on the analysis,the impact behavior between the girder and abutment was simulated by dynamic explicit contact algorithm and the value of friction coefficient was varied to study the effects of pounding and friction on response of the bridge in the earthquake.The results indicate that,for the difference between vertical reaction force of bearings set inside and outside the curved bridge,the inside bearings slide more easily than the outside ones and the force state of outside pier is more complicated than that of inside pier one.The pounding effect reduces the bearing′s anti-sliding capacity and makes both the displacement at the end of the girder and internal force at the bottom of the pier larger.The bearing′s anti-sliding capacity strengthens significantly as the coefficient of friction improves.Both coefficient of friction and pounding effect have a great influence on the torsion moment of the piers.
引文
[1]王东升,孙治国,李晓莉,等.汶川大地震曲线梁桥震害及破坏机理分析[J].防灾减灾工程学报,2010,30(5):572-579.Wang D Sh,Sun Zh G,Li X L,et al.Seismic damage investigation and failure mechanism analysis of curved bridges in wenchuan earthquake[J].Journal of Disaster Prevention and Mitigation Engineering,2010,30(5):572-579.
[2]王东升,郭迅,孙治国,等.汶川大地震公路桥梁震害初步调查[J].地震工程与工程振动,2009,29(3):84-94.Wang D Sh,Guo X,Sun Zh G,et al.Damage to highway bridges during Wenchuan earthquake[J].Journal of Earthquake and Engineering Vibration,2009,29(3):84-94.
[3]Hall J F,Holmes W T,Somers P.Northridge earthquake of January 17,1994:reconnaissance report[D].USA:Earthquake Engineering Research Institute,1996.
[4]聂利英,李建中,胡世德,等.地震作用下板式橡胶支座滑动引起的城市立交中的动力耦合作用[J].工程力学,2006,23(11):14-20.Nie L Y,Li J Zh,Hu Sh D,et al.Dynamic response coupled by rubber bearing sliding in interchange bridge under earthquake[J].Engineering Mechanics,2006,23(11):14-20.
[5]范立础,聂利英,李建中.地震作用下板式橡胶支座滑动的动力性能分析[J].中国公路学报,2003,16(4):30-35.Fan L Ch,Nie L Y,Li J Zh.Dynamic characteristic analysis of laminated rubber bearing sliding under earthquake[J].China Journal of Highway and Transport,2003,16(4):30-35.
[6]徐略勤,李建中,吴陶晶.碰撞效应对非规则梁桥横向地震反应的影响[J].振动与冲击,2011,30(4):95-100.Xu L Q,Li J Zh,Wu T J.Influence of pounding effects on transverse seismic response of a nonstandard girder bridge[J].Journal of Vibration and Shock,2011,30(4):95-100.
[7]汤虎,李建中.地震动特性对公路桥梁板式橡胶支座滑动反应影响[J].工程力学,2013,30(10):154-162.Tang H,Li J Zh.Effect of ground motion characteristics on sliding response of elastomeric pad bearings in highway bridges[J].Engineering Mechanics,2013,30(10):154-162.
[8]Wang C J,Shih M H.Performance study of a bridge involving sliding decks and pounded abutment during a violent earthquake[J].Engineering Structures,2007,29(5):802-812.
[9]聂利英,李建中,范立础.滑动支座中竖向动反力对桥梁结构动力性能的影响[J].同济大学学报,2002,30(11):1290-1294.Nie L Y,Li J Zh,Fan L Ch.Effects of dynamic vertical resistance force of sliding bearing of bridges[J].Journal of Tongji University,2002,30(11):1290-1294.
[10]孙广俊,李鸿晶,赵鹏飞,等.非规则多跨简支梁桥纵向地震反应及参数影响分析[J].防灾减灾工程学报,2013,33(4):441-448.Sun G J,Li H J,Zhao P F,et al.Longitudinal seismic response and parameter influence analysis for multi-span simply supported girder bridge with unconventional configurations[J].Journal of Disaster Prevention and Mitigation Engineering,2013,33(4):441-448.
[11]陆新征,林旭川,叶列平.多尺度有限元建模方法及其应用[J].华中科技大学学报(城市科学版),2008,25(4):76-80.Lu X Zh,Lin X Ch,Ye L P.Multi-scale finite element modeling and its application in structural analysis[J].Journal of Huazhong University of Science and Technology,2008,25(4):76-80.
[12]Lee J,Fenves G L.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998,124(8):892-900.
[13]庄茁,由小川,芩松,等.基于ABAQUS的有限元分析和应用[M].北京:清华大学出版社,2009.Zhuang Zh,You X Ch,Qin S,et al.Finite Element Analysis and Application Baseed on ABAQUS[M].Beijing:Tsinghua University Press,2009.
[14]王勖成.有限单元法[M].北京:清华大学出版社,2008.Wang X Ch.Finite Element Method[M].Beijing:Tsinghua University Press,2008.
[2]王东升,郭迅,孙治国,等.汶川大地震公路桥梁震害初步调查[J].地震工程与工程振动,2009,29(3):84-94.Wang D Sh,Guo X,Sun Zh G,et al.Damage to highway bridges during Wenchuan earthquake[J].Journal of Earthquake and Engineering Vibration,2009,29(3):84-94.
[3]Hall J F,Holmes W T,Somers P.Northridge earthquake of January 17,1994:reconnaissance report[D].USA:Earthquake Engineering Research Institute,1996.
[4]聂利英,李建中,胡世德,等.地震作用下板式橡胶支座滑动引起的城市立交中的动力耦合作用[J].工程力学,2006,23(11):14-20.Nie L Y,Li J Zh,Hu Sh D,et al.Dynamic response coupled by rubber bearing sliding in interchange bridge under earthquake[J].Engineering Mechanics,2006,23(11):14-20.
[5]范立础,聂利英,李建中.地震作用下板式橡胶支座滑动的动力性能分析[J].中国公路学报,2003,16(4):30-35.Fan L Ch,Nie L Y,Li J Zh.Dynamic characteristic analysis of laminated rubber bearing sliding under earthquake[J].China Journal of Highway and Transport,2003,16(4):30-35.
[6]徐略勤,李建中,吴陶晶.碰撞效应对非规则梁桥横向地震反应的影响[J].振动与冲击,2011,30(4):95-100.Xu L Q,Li J Zh,Wu T J.Influence of pounding effects on transverse seismic response of a nonstandard girder bridge[J].Journal of Vibration and Shock,2011,30(4):95-100.
[7]汤虎,李建中.地震动特性对公路桥梁板式橡胶支座滑动反应影响[J].工程力学,2013,30(10):154-162.Tang H,Li J Zh.Effect of ground motion characteristics on sliding response of elastomeric pad bearings in highway bridges[J].Engineering Mechanics,2013,30(10):154-162.
[8]Wang C J,Shih M H.Performance study of a bridge involving sliding decks and pounded abutment during a violent earthquake[J].Engineering Structures,2007,29(5):802-812.
[9]聂利英,李建中,范立础.滑动支座中竖向动反力对桥梁结构动力性能的影响[J].同济大学学报,2002,30(11):1290-1294.Nie L Y,Li J Zh,Fan L Ch.Effects of dynamic vertical resistance force of sliding bearing of bridges[J].Journal of Tongji University,2002,30(11):1290-1294.
[10]孙广俊,李鸿晶,赵鹏飞,等.非规则多跨简支梁桥纵向地震反应及参数影响分析[J].防灾减灾工程学报,2013,33(4):441-448.Sun G J,Li H J,Zhao P F,et al.Longitudinal seismic response and parameter influence analysis for multi-span simply supported girder bridge with unconventional configurations[J].Journal of Disaster Prevention and Mitigation Engineering,2013,33(4):441-448.
[11]陆新征,林旭川,叶列平.多尺度有限元建模方法及其应用[J].华中科技大学学报(城市科学版),2008,25(4):76-80.Lu X Zh,Lin X Ch,Ye L P.Multi-scale finite element modeling and its application in structural analysis[J].Journal of Huazhong University of Science and Technology,2008,25(4):76-80.
[12]Lee J,Fenves G L.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998,124(8):892-900.
[13]庄茁,由小川,芩松,等.基于ABAQUS的有限元分析和应用[M].北京:清华大学出版社,2009.Zhuang Zh,You X Ch,Qin S,et al.Finite Element Analysis and Application Baseed on ABAQUS[M].Beijing:Tsinghua University Press,2009.
[14]王勖成.有限单元法[M].北京:清华大学出版社,2008.Wang X Ch.Finite Element Method[M].Beijing:Tsinghua University Press,2008.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心