近场橡胶支座隔震设计探讨
|
摘要
近断层地震动具有不同于远场地震动的动力特征。按建筑抗震设计规范设计了非隔震与橡胶支座隔震钢筋混凝土框架结构,选取近断层与远场地震动记录进行分析。近断层地震动作用下,隔震后结构的最大层间剪力与最大层间位移均减小为非隔震结构的0.3倍左右,隔震对近断层地震动响应具有良好的减震效果;与远场地震动作用相比,近断层地震动作用下的上部结构最大层间位移角增大3～5倍,隔震层最大位移增大15倍,须对隔震层采取防止侧移失稳措施。现行规范以近场影响系数考虑近场橡胶支座隔震设计,尚需随近断层地震动研究新成果进一步完善。
There are different characters between near-fault and far-field ground motions.A RC frame structure and a base-isolating RC frame structure are designed according to the Code for Seismic Design of Buildings.Responses of up-structure and isolating layer to near-fault and far-field ground motions are computed.The maximums of layer shear forces and layer displacements of the isolating structure decrease to 0.3 times that of the maximum of the no-isolating structure.The maximum of up-structure layer displacement ratio under near-fault ground motions increases to 3~5 times that of the maximum of far-fault ground motions.The maximum isolating layer displacement under near-fault ground motion increases to 15 times that of the maximum of far-fault ground motions.The isolation has a positive effect to near-fault ground motions,but the safety of isolating layer must be ensured.The rule of rubber bearing isolation design using influence coefficient considering near-fault ground motion in the Code for Seismic Design of Buildings needs to be improved.
There are different characters between near-fault and far-field ground motions.A RC frame structure and a base-isolating RC frame structure are designed according to the Code for Seismic Design of Buildings.Responses of up-structure and isolating layer to near-fault and far-field ground motions are computed.The maximums of layer shear forces and layer displacements of the isolating structure decrease to 0.3 times that of the maximum of the no-isolating structure.The maximum of up-structure layer displacement ratio under near-fault ground motions increases to 3~5 times that of the maximum of far-fault ground motions.The maximum isolating layer displacement under near-fault ground motion increases to 15 times that of the maximum of far-fault ground motions.The isolation has a positive effect to near-fault ground motions,but the safety of isolating layer must be ensured.The rule of rubber bearing isolation design using influence coefficient considering near-fault ground motion in the Code for Seismic Design of Buildings needs to be improved.
引文
[1]刘启方,袁一凡,金星.近断层地震动的基本特征[J].地震工程与工程振动,2006,26(1):1～10Liu Qi-fang,Yuan Yi-fan,Jin Xing.BasicCharacteristics of Near-fault Ground Motion[J].Earthquake Engineering and Engineering Vibration,2006,26(1):1～10(in Chinese)
[2]王海云,谢礼立.近断层强地震动的特点[J].哈尔滨工业大学学报,2006,38(12):2070～2076Wang Hai-yun,Xie Li-li,Characteristics of Near-faultStrong Ground Motions[J].Journal of Harbin InstituteTechnology,2006,38(12):2070～2076(in Chinese)
[3]Mavroeidis G P,Papageorgiou A S.Near-source StrongGround Motion:Characteristics and Design Issues[A].Proc.of the Seventh U.S.National Conf on EarthquakeEngineering(7NCEE)[C].Boston,Massachusetts,2002:21～25
[4]杨迪雄,李刚,程耿东.近断层脉冲型地震动作用下隔震结构地震反应分析[J].地震工程与工程振动,2005,25(2):119～124Yang Di-xiong,Li Gang,Cheng Geng-dong.SeismicAnalysis of Base-isolated Structures Subjected to Near-fault Pulse-like Ground Motions[J].EarthquakeEngineering and Engineering Vibration,2005,25(2):119～124(in Chinese)
[5]杨迪雄,赵岩,李刚.近断层地震动运动特征对长周期结构地震响应的影响分析[J].防灾减灾学报,2007,27(2):133～140 Yang Di-xiong,Zhao Yan,Li Gang.Influence Analysis of Motion Characteristics of Near-fault Ground Motions on Seismic Responses of Long-period Structures[J].Journal of Disaster Prevention and Mitigation Engineering,2007,27(2):133～140(in Chinese)
[6]殷伟希,李云华.近场地震动对基础隔震结构的影响[J].广东土木与建筑,2009,(10):16～18 Yin Wei-xi,Li Yun-hua.Research on Isolated Structures on Near-field Ground Motions[J].Guangdong Architecture Civil Engineering,2009,(10):16～18(in Chinese)
[7]GB50011-2010,建筑抗震设计规范[S]GB50011-2010,Code for Seismic Design of Buildings[S](in Chinese)
[2]王海云,谢礼立.近断层强地震动的特点[J].哈尔滨工业大学学报,2006,38(12):2070～2076Wang Hai-yun,Xie Li-li,Characteristics of Near-faultStrong Ground Motions[J].Journal of Harbin InstituteTechnology,2006,38(12):2070～2076(in Chinese)
[3]Mavroeidis G P,Papageorgiou A S.Near-source StrongGround Motion:Characteristics and Design Issues[A].Proc.of the Seventh U.S.National Conf on EarthquakeEngineering(7NCEE)[C].Boston,Massachusetts,2002:21～25
[4]杨迪雄,李刚,程耿东.近断层脉冲型地震动作用下隔震结构地震反应分析[J].地震工程与工程振动,2005,25(2):119～124Yang Di-xiong,Li Gang,Cheng Geng-dong.SeismicAnalysis of Base-isolated Structures Subjected to Near-fault Pulse-like Ground Motions[J].EarthquakeEngineering and Engineering Vibration,2005,25(2):119～124(in Chinese)
[5]杨迪雄,赵岩,李刚.近断层地震动运动特征对长周期结构地震响应的影响分析[J].防灾减灾学报,2007,27(2):133～140 Yang Di-xiong,Zhao Yan,Li Gang.Influence Analysis of Motion Characteristics of Near-fault Ground Motions on Seismic Responses of Long-period Structures[J].Journal of Disaster Prevention and Mitigation Engineering,2007,27(2):133～140(in Chinese)
[6]殷伟希,李云华.近场地震动对基础隔震结构的影响[J].广东土木与建筑,2009,(10):16～18 Yin Wei-xi,Li Yun-hua.Research on Isolated Structures on Near-field Ground Motions[J].Guangdong Architecture Civil Engineering,2009,(10):16～18(in Chinese)
[7]GB50011-2010,建筑抗震设计规范[S]GB50011-2010,Code for Seismic Design of Buildings[S](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