强震作用下LRB规则连续梁桥简化设计方法研究
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摘要
基于等效线性方法及等效塑性铰理论,根据铅芯橡胶支座(LRB)规则连续梁桥的动力特性以及强震作用下隔震支座和桥墩非线性特征将规则连续梁桥结构简化为单自由度体系,并对于体系的等效刚度及等效阻尼比进行了估计。选取主梁位移及桥墩墩顶位移作为目标位移,利用修正的长周期高阻尼位移反应谱进行了基于位移的桥梁抗震设计。最后给出了设计实例,设计结果与采用SAP2000计算的弹塑性时程分析结果比较满足工程精度要求,适用于具有不同性能水平下的规则型LRB隔震桥梁的初步分析和设计,可以为强震作用下LRB隔震桥梁地震反应分析提供参考。
Based on the equivalent linear method and the equivalent plastic hinge theory,regular continuous bridge structure is simplified as the single degree-of-freedom system according to the dynamic performance of the lead rubber bearing(LRB)isolated bridge and non-linear characteristic of LRB and pier when LRB isolated bridge experience strong motion,and the equivalent stiffness and damping ratio of the system are estimated.The displacement of gird and top of pier are choosed as target displacement,and displacement-based seismic design is presented by using the revised displacement response spectrum which has long period and high damping.Finally,design example is shown,and compared with the design result and the elastoplasticity time history analysis result using the SAP2000 computation,it satisfies project accuracy requirement,and is suitable for preliminary analysis and design of regular LRB isolated bridge under the different performance level,and can provide the reference for earthquake response analysis of regular LRB isolated bridge under strong motion.
Based on the equivalent linear method and the equivalent plastic hinge theory,regular continuous bridge structure is simplified as the single degree-of-freedom system according to the dynamic performance of the lead rubber bearing(LRB)isolated bridge and non-linear characteristic of LRB and pier when LRB isolated bridge experience strong motion,and the equivalent stiffness and damping ratio of the system are estimated.The displacement of gird and top of pier are choosed as target displacement,and displacement-based seismic design is presented by using the revised displacement response spectrum which has long period and high damping.Finally,design example is shown,and compared with the design result and the elastoplasticity time history analysis result using the SAP2000 computation,it satisfies project accuracy requirement,and is suitable for preliminary analysis and design of regular LRB isolated bridge under the different performance level,and can provide the reference for earthquake response analysis of regular LRB isolated bridge under strong motion.
引文
[1]范立础.桥梁隔震设计[M].北京:人民交通出版社,2001.
[2]日本建筑学会.隔震结构设计[M].刘文光,译.北京:地震出版社,2006.
[3]杨玉民,胡勃,袁万城.基于位移反应谱的连续梁桥抗震设计简化方法[J].同济大学学报,1999,24(4):150-154.
[4]杨晓国,敬大德,宋小平.桥墩扭转刚度对连续梁桥横桥向地震反应的影响[J].结构工程师,2008,24(6):96-99.
[5]周锡元,李中锡.规则型隔震桥梁结构的简化分析方法[J].土木工程学报,2001,34(3):53-58.
[6]黄建文,朱唏,张静.隔震桥梁结构的简化反应分析及设计参数研究[J].北方交通大学学报,2004,28(1):17-22.
[7]郑越,陈兴冲,戴利民,等.柱式钢筋混凝土桥墩的弹塑性抗震简化计算[J].公路交通科技,2006,23(4):76-79.
[8]Hwang J.S.,Chang K.C.and Tsai M.H..CompositeDamping Ratio of Seismically Isolated Regular Bridges[J].Engineering Structures,Elsevier Science Ltd,1997,55-62.
[9]Kelly.J.M.Earthquake Resistant Design With Rubber.Second Edition[Z].SpringerOVerlag London Limited,1997.
[10]Hwang J S,Sheng L H,Gates J H.Practical Analysisof Bridges on Isolation Bearings with Bi-Linear HysteresisCharacteristics[J].Earthquake Spectra,1994,10(4):705.
[11]Manuel Jara,Joan R.Casasb.A direct displacement-based method for the seismic design of bridges on bi-line-ar isolation devices[J].Engineering Structures,ElsevierScience Ltd,2006,869-879.
[12]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[13]弓俊青,朱.以位移为基础的钢筋混凝土桥梁墩柱抗震设计[J].中国公路学报,2001,14(4):42-46.
[2]日本建筑学会.隔震结构设计[M].刘文光,译.北京:地震出版社,2006.
[3]杨玉民,胡勃,袁万城.基于位移反应谱的连续梁桥抗震设计简化方法[J].同济大学学报,1999,24(4):150-154.
[4]杨晓国,敬大德,宋小平.桥墩扭转刚度对连续梁桥横桥向地震反应的影响[J].结构工程师,2008,24(6):96-99.
[5]周锡元,李中锡.规则型隔震桥梁结构的简化分析方法[J].土木工程学报,2001,34(3):53-58.
[6]黄建文,朱唏,张静.隔震桥梁结构的简化反应分析及设计参数研究[J].北方交通大学学报,2004,28(1):17-22.
[7]郑越,陈兴冲,戴利民,等.柱式钢筋混凝土桥墩的弹塑性抗震简化计算[J].公路交通科技,2006,23(4):76-79.
[8]Hwang J.S.,Chang K.C.and Tsai M.H..CompositeDamping Ratio of Seismically Isolated Regular Bridges[J].Engineering Structures,Elsevier Science Ltd,1997,55-62.
[9]Kelly.J.M.Earthquake Resistant Design With Rubber.Second Edition[Z].SpringerOVerlag London Limited,1997.
[10]Hwang J S,Sheng L H,Gates J H.Practical Analysisof Bridges on Isolation Bearings with Bi-Linear HysteresisCharacteristics[J].Earthquake Spectra,1994,10(4):705.
[11]Manuel Jara,Joan R.Casasb.A direct displacement-based method for the seismic design of bridges on bi-line-ar isolation devices[J].Engineering Structures,ElsevierScience Ltd,2006,869-879.
[12]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[13]弓俊青,朱.以位移为基础的钢筋混凝土桥梁墩柱抗震设计[J].中国公路学报,2001,14(4):42-46.
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