两种减隔震支座动力参数的设计方法及减隔震效果差异研究
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摘要
为探讨强震区梁式桥减隔震支座的合理设计问题,根据设计经验归纳总结了铅芯橡胶和摩擦摆两种减隔震支座动力参数的一般设计方法及流程;针对实桥给出了两种支座的详细动力设计参数,并对参数进行了敏感性分析;根据时程分析结果对减隔震效果差异进行了对比,运用等效线性化理论解释了差异的内在原因。研究结果表明:支座摩擦系数并不是越大越有利,而应通过分析确定;由于铅芯橡胶与摩擦摆支座等效刚度值的明显不同,导致随着地震作用的提高结构内力响应差别将逐渐减小,而梁端位移响应差别呈显著增大趋势;建议高烈度区桥梁减隔震支座选型宜选用铅芯橡胶支座。
To discuss the rational design problems of seismic isolation bearing of girder bridges in meizoseismal areas,this paper summarizes the general design methods and processes of dynamic parameters about the lead plug-rubber and friction pendulum isolation bearing based on design experience,carries out parameter sensitivity analysis after giving details of two dynamic design parameters,compares the isolation effect difference according to the results of time-history analysis,and explains the intrinsic cause of differences by equivalent linear theory. The result indicates that friction coefficient is not the larger the better and it should be determined by analysis. Because of different equivalent stiffness values of lead plug-rubber bearings and friction pendulum,as the seismic action strengthens,the differences of structural earthquake internal force response will gradually reduce,but the differences of displacement response at beam ends will significantly increase. It recommends that type selection of bearing should use lead plug rubber bearings in meizoseismal areas.
To discuss the rational design problems of seismic isolation bearing of girder bridges in meizoseismal areas,this paper summarizes the general design methods and processes of dynamic parameters about the lead plug-rubber and friction pendulum isolation bearing based on design experience,carries out parameter sensitivity analysis after giving details of two dynamic design parameters,compares the isolation effect difference according to the results of time-history analysis,and explains the intrinsic cause of differences by equivalent linear theory. The result indicates that friction coefficient is not the larger the better and it should be determined by analysis. Because of different equivalent stiffness values of lead plug-rubber bearings and friction pendulum,as the seismic action strengthens,the differences of structural earthquake internal force response will gradually reduce,but the differences of displacement response at beam ends will significantly increase. It recommends that type selection of bearing should use lead plug rubber bearings in meizoseismal areas.
引文
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[2]吴彬,庄军生.铅芯橡胶支座力学性能及其在桥梁工程中应用研究[J].中国铁道科学,2004,25(4):138-140.WU Bing,ZHUANG Junsheng.Study on mechanical characteristics of lead-rubber bearing and its application for shock reduction/isolation in bridge engineering[J].China Railway Sciencs,2004,25(4):138-140.(in Chinese)
[3]国祥明,肖盛燮.对桥梁两种橡胶支座减隔震性能的理论分析[J].重庆交通学院学报,2006,25(5):24-27.GUO Xiangming,XIAO Shengxie.The theory analysis of two knds of bridge rubber bearing for isolated function[J].Journal of Chongqing Jiaotong University,2006,25(5):24-27.(in Chinese)
[4]焦驰宇,胡世德,管仲国.FPS抗震支座分析模型的比较研究[J].振动与冲击,2007,26(10):113-117.JIAO Chiyu,HU Shide,GUAN Zhongguo.Comparison study on analysis models of FPS seismic isolation support[J].Journal of Vibration and Shock,2007,26(10):113-117.(in Chinese)
[5]原媛,李汝庚,石琼辉.铅芯橡胶支座的双线型模型研究[J].广州大学学报(自然科学版),2005,4(3):272-276.YUAN Yuan,,LI Rugeng,SHI Qionghui.Study on bilinear model of lead rubber isolating bearing[J].Journal of Guangzhou University:Natural Science Edition,2005,4(3):272-276.(in Chinese)
[6]何友娣,阮怀圣,李龙安.桥梁结构减隔震设计与应用研究报告[R].武汉:中铁大桥勘测设计院集团有限公司,2011.HE Youdi,RUAN Huaisheng,LI Longan.Study report of bridge structure seismic isolation design and application[R].Wuhan:China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,2011.(in Chinese)
[7]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001.FAN Lichu,WANG Zhiqiang.Bridge Seismic Isolation Design[M].Beijing:China Communications Press,2001.(in Chinese)
[8]朱东生,劳远昌,沈大元,等.隔震桥梁设计参数的研究[J].土木工程学报.2000,33(5):52-56ZHU Dongsheng,LAO Yuanchang,SHEN Dayuan,et al.Research on some design parameters of seismically isolated bridges[J].China Civil Engineering Journal,2000,33(5):52-56.(in Chinese)
[9]彭天波,李建中,范立础.双曲面球型减隔震支座的开发及应用[J].同济大学学报(自然科学版),2007,35(2):176:180.PENG Tianbo,LI Jianzhong,FAN Lichu.Development and application of double spherical aseismic bearing[J].Journal of Tongji University:Natural Science,2007,35(2):176-180.(in Chinese)
[10]王建强,王利娟.铅芯叠层橡胶支座恢复力模型研究[J].世界地震工程,2005,21(2):151-154.WANG Jianqiang,WANG Lijuan.Study on restoring forcemodel of a lead rubber bearing[J].World Earthquake Engineering,2005,21(2):151-154.(in Chinese)