基于土-结构相互作用的隔震连续梁桥的地震响应
|
摘要
以典型三跨隔震连续梁桥为工程背景,采用Bouc-Wen滞回恢复力模型,模拟LRB(lead rubber bearings)的力-位移非线性特性,建立了考虑土-结构相互作用的多质点系集中质量有限元计算模型,编制了运用Wilson-θ逐步积分法求解增量形式的土-结构体系非线性运动方程的时程分析程序.利用程序并结合算例分别对考虑土-结构相互作用与按照墩底固结假设的两种桥梁模型进行了隔震前后的时程对比分析.结果表明:在Ⅰ、Ⅱ类场地土上,考虑土-结构相互作用与按照墩底固结假设相比,前者得到的地震响应峰值较大,但峰值相差不大.Ⅲ类场地上,前者的地震响应峰值比后者大得多,不能忽略土-结构相互作用的影响;在同一场地类型下,隔震率对是否考虑土-结构相互作用并不敏感,但Ⅰ、Ⅱ类场地上的隔震效果要明显优于Ⅲ类场地.
Taking the three spans isolated continuous girder bridges for the engineering background,Bouc-Wen restoring force model is adopted to simulate the nonlinear characteristics for LRB,multi-story liner system concentrated quality finite element analytic model considering SSI is established,and the time-history analysis procedure of the Wilson-θ step-by-step integration method used to solve the increment form nonlinear governing equation of motion considering SSI is programmed.We make a contrastive analysis based on before and after isolated bridges model of considering SSI and rigid foundation hypotheses by combining the procedure with calculation example.The results indicate that the considering SSI has larger value on the seismic response than the rigid foundation,but the seismic response value has no great difference between two models under pulse of typeⅠ and Ⅱ.The considering SSI has larger value on the seismic response than the rigid foundation under pulse of type Ⅲ,so the SSI can not be neglected in the isolated seismic design of bridges under pulse of type Ⅲ.The LRB isolated rate has insensitive to considering SSI or not,and LRB isolated rate has no great difference between two models under the same type of pulse,but the effect of LRB under pulse of typeⅠ and Ⅱis superior to effect of LRB under pulse of type Ⅲ.
Taking the three spans isolated continuous girder bridges for the engineering background,Bouc-Wen restoring force model is adopted to simulate the nonlinear characteristics for LRB,multi-story liner system concentrated quality finite element analytic model considering SSI is established,and the time-history analysis procedure of the Wilson-θ step-by-step integration method used to solve the increment form nonlinear governing equation of motion considering SSI is programmed.We make a contrastive analysis based on before and after isolated bridges model of considering SSI and rigid foundation hypotheses by combining the procedure with calculation example.The results indicate that the considering SSI has larger value on the seismic response than the rigid foundation,but the seismic response value has no great difference between two models under pulse of typeⅠ and Ⅱ.The considering SSI has larger value on the seismic response than the rigid foundation under pulse of type Ⅲ,so the SSI can not be neglected in the isolated seismic design of bridges under pulse of type Ⅲ.The LRB isolated rate has insensitive to considering SSI or not,and LRB isolated rate has no great difference between two models under the same type of pulse,but the effect of LRB under pulse of typeⅠ and Ⅱis superior to effect of LRB under pulse of type Ⅲ.
引文
[1]张骏,阎贵平.减隔震支座对梁式桥抗震性能的影响[J].中国公路学报,2002,15(1):38-43.ZHANG Jun,YAN Guiping.Effects of isolation bearingon anti-seismic performance of RC beam bridge[J].ChinaJournal of Highway and Transport,2002,15(1):38-43.(in Chinese)
[2]王丽,阎贵平,孙立.LRB隔震桥梁减震效果分析[J].工程力学,2003,20(5):124-129.WANG Li,YAN Guiping,SUN Li.Analysis of seismicresponse of isolated bridges with LRB[J].EngineeringMechanics,2003,20(5):124-129.(in Chinese)
[3]江宜城,杨德喜,李黎,等.LRB隔震桥梁空间变异性地震随机响应分析[J].振动与冲击,2007,24(1):104-107.JIANG Yicheng,YANG Dexi,LI Li,et al.Stochastic re-sponse analysis of seismically isolated bridges with LRB tospatially varying earthquake ground motions[J].Journal ofVibration and Shock,2007,24(1):104-107.(in Chi-nese)
[4]李建中,辛学忠.连续梁桥减震、隔震体系非线性地震反应分析[J].地震工程与工程振动,1998,18(3):67-73.LI Jianzhong,XIN Xuezhong.Nonlinear seismic responseanalyses of isolation systems for continuous bridges[J].Journal of Earthquake Engineering and Engineering Vibra-tion,1998,18(3):67-73.(in Chinese)
[5]曾攀,阎贵平.铅芯橡胶支座动力特性对连续梁桥地震响应的影响[J].铁道学报,2001,23(5):96-101.ZENG Pan,YAN Guiping.Influence of dynamic charac-teristics of lead-rubber bearing on seismic response of con-tinuous beam bridge[J].Journal of the China Railway soci-ety,2001,23(5):96-101.(in Chinese)
[6]周亚栋,胡兆同,邵旭东,等.桥梁铅销橡胶支座减震效果的影响因素研究[J].湖南大学学报:自然科学版,2008,35(5):16-20.ZHOU Yadong,HU Zhaotong,SHAO Xudong,et al.Re-search on the influential factors of the aseismic effect of leadrubber bearing used in bridge[J].Journal of Hunan Uni-versity:Natural Sciences,2008,35(5):16-20.(in Chi-nese)
[7]朱东升,劳远昌,沈大元,等.LRB隔震桥梁的地震反应特点[J].工程力学,2000,18(1):119-125.ZHU Dongsheng,LAO Yuanchang,SHEN Dayuan,et al.The seismic response features of isolated bridge with LRB[J].Engineering Mechanics,2000,18(1):119-125.(in Chinese)
[8]亓兴军,李小军,李亚琦.桩-土动力相互作用对连续梁桥半主动控制的影响研究[J].振动与冲击,2006,25(5):81-84.QI Xingjun,LI Xiaojun,LI Yaqi.Study on the influenceof pile-soil interaction upon semi-active control of continu-ous beam bridge[J].Journal of Vibration and Shock,2006,25(5):81-84.(in Chinese)
[9]刘云贺,赵晓娟,王克成.土-结构相互作用对LRB减震桥梁影响的分析[J].西安理工大学学报,2003,19(1):13-17.LIU Yunhe,ZHAO Xiaojuan,WANG Kecheng.An anal-ysis of effect of soil-structure interaction upon bridge ofseismic reduction with LRB[J].Journal of Xi’an Universi-ty of Technology,2003,19(1):13-17.(in Chinese)
[10]李黎,陈元坤,杨金虎,等.桩-土-桥相互作用对隔震连续梁桥地震响应的影响[J].工程抗震与加固改造,2010,32(1):50-56.LI Li,CHEN Yuankun,YANG Jinhu,et al.Influencesof soil-pile-structure interaction on seismic response ofcontinuous bridge[J].Earthquake Resistant Engineeringand Retrofitting,2010,32(1):50-56.(in Chinese)
[11]Chaudhary M T A,Abe M,Fujino Y.Identification ofsoil-structure interaction effect in base-isolated bridgesfrom earthquake records[J].Soil Dynamics and Earth-quake Engineering,2001,21(8):713-725.
[12]Hwang J S,Sheng L H.Effective stiffness and equivalentdamping of base-isolated Bridges[J].Journal of StructureEngineering,1993,119(10):3094-3101.
[13]Wen Y K.Method of random vibration of hysteretic sys-tems[J].Journal of Engineering Mechanics Division,1976,102(2):249-263.
[14]Penzien J,Scheffey C F,Parmelee,R A.Seismic analy-sis of bridges on long piles[J].Journal of EngineeringMechanics Division,1964,90(3):223-254.
[15]JTG/T B02-01—2008,公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.JTG/T B02-01—2008,Guidelines for seismic design ofhighway bridges[S].Beijing:China CommunicationsPress,2008.(in Chinese)
[2]王丽,阎贵平,孙立.LRB隔震桥梁减震效果分析[J].工程力学,2003,20(5):124-129.WANG Li,YAN Guiping,SUN Li.Analysis of seismicresponse of isolated bridges with LRB[J].EngineeringMechanics,2003,20(5):124-129.(in Chinese)
[3]江宜城,杨德喜,李黎,等.LRB隔震桥梁空间变异性地震随机响应分析[J].振动与冲击,2007,24(1):104-107.JIANG Yicheng,YANG Dexi,LI Li,et al.Stochastic re-sponse analysis of seismically isolated bridges with LRB tospatially varying earthquake ground motions[J].Journal ofVibration and Shock,2007,24(1):104-107.(in Chi-nese)
[4]李建中,辛学忠.连续梁桥减震、隔震体系非线性地震反应分析[J].地震工程与工程振动,1998,18(3):67-73.LI Jianzhong,XIN Xuezhong.Nonlinear seismic responseanalyses of isolation systems for continuous bridges[J].Journal of Earthquake Engineering and Engineering Vibra-tion,1998,18(3):67-73.(in Chinese)
[5]曾攀,阎贵平.铅芯橡胶支座动力特性对连续梁桥地震响应的影响[J].铁道学报,2001,23(5):96-101.ZENG Pan,YAN Guiping.Influence of dynamic charac-teristics of lead-rubber bearing on seismic response of con-tinuous beam bridge[J].Journal of the China Railway soci-ety,2001,23(5):96-101.(in Chinese)
[6]周亚栋,胡兆同,邵旭东,等.桥梁铅销橡胶支座减震效果的影响因素研究[J].湖南大学学报:自然科学版,2008,35(5):16-20.ZHOU Yadong,HU Zhaotong,SHAO Xudong,et al.Re-search on the influential factors of the aseismic effect of leadrubber bearing used in bridge[J].Journal of Hunan Uni-versity:Natural Sciences,2008,35(5):16-20.(in Chi-nese)
[7]朱东升,劳远昌,沈大元,等.LRB隔震桥梁的地震反应特点[J].工程力学,2000,18(1):119-125.ZHU Dongsheng,LAO Yuanchang,SHEN Dayuan,et al.The seismic response features of isolated bridge with LRB[J].Engineering Mechanics,2000,18(1):119-125.(in Chinese)
[8]亓兴军,李小军,李亚琦.桩-土动力相互作用对连续梁桥半主动控制的影响研究[J].振动与冲击,2006,25(5):81-84.QI Xingjun,LI Xiaojun,LI Yaqi.Study on the influenceof pile-soil interaction upon semi-active control of continu-ous beam bridge[J].Journal of Vibration and Shock,2006,25(5):81-84.(in Chinese)
[9]刘云贺,赵晓娟,王克成.土-结构相互作用对LRB减震桥梁影响的分析[J].西安理工大学学报,2003,19(1):13-17.LIU Yunhe,ZHAO Xiaojuan,WANG Kecheng.An anal-ysis of effect of soil-structure interaction upon bridge ofseismic reduction with LRB[J].Journal of Xi’an Universi-ty of Technology,2003,19(1):13-17.(in Chinese)
[10]李黎,陈元坤,杨金虎,等.桩-土-桥相互作用对隔震连续梁桥地震响应的影响[J].工程抗震与加固改造,2010,32(1):50-56.LI Li,CHEN Yuankun,YANG Jinhu,et al.Influencesof soil-pile-structure interaction on seismic response ofcontinuous bridge[J].Earthquake Resistant Engineeringand Retrofitting,2010,32(1):50-56.(in Chinese)
[11]Chaudhary M T A,Abe M,Fujino Y.Identification ofsoil-structure interaction effect in base-isolated bridgesfrom earthquake records[J].Soil Dynamics and Earth-quake Engineering,2001,21(8):713-725.
[12]Hwang J S,Sheng L H.Effective stiffness and equivalentdamping of base-isolated Bridges[J].Journal of StructureEngineering,1993,119(10):3094-3101.
[13]Wen Y K.Method of random vibration of hysteretic sys-tems[J].Journal of Engineering Mechanics Division,1976,102(2):249-263.
[14]Penzien J,Scheffey C F,Parmelee,R A.Seismic analy-sis of bridges on long piles[J].Journal of EngineeringMechanics Division,1964,90(3):223-254.
[15]JTG/T B02-01—2008,公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.JTG/T B02-01—2008,Guidelines for seismic design ofhighway bridges[S].Beijing:China CommunicationsPress,2008.(in Chinese)
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