粘滞阻尼器在高墩连续梁桥抗震设计中的应用
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摘要
以大理州鸡足山旅游公路宝丰寺大桥为工程背景,基于桥梁地震动方程建立了空间非线性有限元模型,研究粘滞阻尼器参数及其设置位置对山区高墩连续梁桥减震效果的影响,并同其他减震措施进行了比较,以分析进行高墩连续梁桥减震设计的合理方法。计算结果表明,粘滞阻尼器在高墩连续梁桥的抗震设计中具有优越的性能,对结构的位移控制以及内力的耗散作用非常明显,而铅芯橡胶支座由于附加刚度的影响造成边矮墩内力过于集中,在减震性能上不及粘滞阻尼器;粘滞阻尼器的安装位置对结构减震性能具有较大的影响,设计时须充分考虑,以确保结构的减震性能和工程的经济性。
By taking the Baofengsi Bridge on the tourist road of Jizu Mountain in Dali Autonomous Prefecture as the research object,a spatial nonlinear finite element model was established based on the seismic dynamic equation of bridge.The proposed model was used to analyze the effects of the parameters and locations of viscous dampers on the seismic response of the high-pier continuous bridge in mountainous area,then the results were compared with other measures of mitigating seismic response in order to explore the most effective means for getting seismic response control of the high-pier continuous bridge.The results indicate that the viscous damper has superior performance on mitigating the seismic response of the high-pier continuous bridge,particularly on the displacement control of the structure and the dissipation of inner force.The seismic response control of lead rubber bearing is not as good as that of viscous damper,because the force of low piers is too centralized by its added stiffness.In order to ensure the seismic response control of the structure and the economy of project,the designers must take the location of the viscous damper into account because it has a major impact on the mitigation of the seismic response of the structure.
By taking the Baofengsi Bridge on the tourist road of Jizu Mountain in Dali Autonomous Prefecture as the research object,a spatial nonlinear finite element model was established based on the seismic dynamic equation of bridge.The proposed model was used to analyze the effects of the parameters and locations of viscous dampers on the seismic response of the high-pier continuous bridge in mountainous area,then the results were compared with other measures of mitigating seismic response in order to explore the most effective means for getting seismic response control of the high-pier continuous bridge.The results indicate that the viscous damper has superior performance on mitigating the seismic response of the high-pier continuous bridge,particularly on the displacement control of the structure and the dissipation of inner force.The seismic response control of lead rubber bearing is not as good as that of viscous damper,because the force of low piers is too centralized by its added stiffness.In order to ensure the seismic response control of the structure and the economy of project,the designers must take the location of the viscous damper into account because it has a major impact on the mitigation of the seismic response of the structure.
引文
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[5]宋旭明.自锚式悬索桥的粘滞阻尼器减震控制[J].中南大学学报(自然科学版),2009,37(3):104-108.SONG Xuming.Seismic response analysis and control of self-anchored suspension bridge[J].Journal of Central South University(Science andTechnology),2009,37(3):104-108.
[2]范立础,胡世德,叶爱君,大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.FAN Lichu,HU Shide,YE Aijun.Long-span bridge earthquake resistant design[M].Beijing:China Communications Press,2001.
[3]杨孟刚,胡建华,陈政清.独塔自锚式悬索桥地震响应分析[J].中南大学学报(自然科学版),2005,36(1):133-137.YANG Menggang,HU Jianhua,CHEN Zhengqing.Seismic response analysis of self-anchored suspension bridge with single tower[J].Journal ofCentral South University:(Science and Technology),2005,36(1):133-137.
[4]刘忠平.三汊矶湘江大桥自锚式悬索桥地震反应研究[D].长沙:中南大学,2007.LIU Zhongping.Seismic response analysis and control of self-anchored suspension bridge[D].Changsha:of Central South University,2007.
[5]宋旭明.自锚式悬索桥的粘滞阻尼器减震控制[J].中南大学学报(自然科学版),2009,37(3):104-108.SONG Xuming.Seismic response analysis and control of self-anchored suspension bridge[J].Journal of Central South University(Science andTechnology),2009,37(3):104-108.
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