LRB铅芯直径D和硬化比α对桥梁减隔震效果的影响研究
|
摘要
论文以湖南省通平高速公路张家坡5×30 m等截面多跨连续梁桥为工程背景,建立了其右幅桥铅芯橡胶支座(LRB)减隔震与左幅桥未减隔震模型,其中减隔震桥梁模型中的LRB采用双向恢复力模型,以MIDAS有限元软件中带有刚度和阻尼的非线性弹簧模拟。为了使LRB充分发挥减隔震作用并使减隔震设计有据可依,系统地讨论了LRB的参数铅芯直径D和硬化α对桥梁减隔震效果的影响。分析结果表明:铅芯直径D对多跨连续梁桥减隔震效果影响明显,应综合位移和内力两方面因素进行优化选择;硬化比α对多跨连续梁桥减隔震效果影响不大,在减隔震设计中可作为辅助比较参数。
In this study,by use of two-way-coupling model of lead rubber bearing(LRB) simulated by the nonlinear spring element both with rigidity and damp in MIDAS finite element software,on the background of Zhangjiapo bridge,a 5×30 m equal section multi-span continuous beam bridge of Tongping highway in Hunan province,two analysis models of the right panel bridge with LRB and the left panel bridge without LRB are founded respectively.In order to make the best of LRB effect on seismic isolation and to make seismic isolation design more reasonable,the influence of LRB lead core diameter D and stiffness ratio α on bridge seismic isolation effect were discussed systematically.The results demonstrate that the influence of LRB lead core diameter D on bridge seismic isolation is obvious and LRB lead core diameter D should be optimized and selected with the displacement and internal force of bridge taken into account,while the influence of LRB stiffness ratio α on bridge seismic isolation was not too obvious and LRB stiffness ratio α could be used as an auxiliary comparison parameter in seismic isolation design.
In this study,by use of two-way-coupling model of lead rubber bearing(LRB) simulated by the nonlinear spring element both with rigidity and damp in MIDAS finite element software,on the background of Zhangjiapo bridge,a 5×30 m equal section multi-span continuous beam bridge of Tongping highway in Hunan province,two analysis models of the right panel bridge with LRB and the left panel bridge without LRB are founded respectively.In order to make the best of LRB effect on seismic isolation and to make seismic isolation design more reasonable,the influence of LRB lead core diameter D and stiffness ratio α on bridge seismic isolation effect were discussed systematically.The results demonstrate that the influence of LRB lead core diameter D on bridge seismic isolation is obvious and LRB lead core diameter D should be optimized and selected with the displacement and internal force of bridge taken into account,while the influence of LRB stiffness ratio α on bridge seismic isolation was not too obvious and LRB stiffness ratio α could be used as an auxiliary comparison parameter in seismic isolation design.
引文
[1]Buckle G,Mayes R L.Seismic isolation history applicationandperformance-A world view[J].Earthquake Spectra,1990,6(2):178-186.
[2]Tan R Y,Huang M C.System identification of a bridge withlead-rubber bearings[J].Computers and Structures,2000,74(3):267-280.
[3]李程,张念来.铁路钢桁拱桥减隔震支座设计参数的优化研究[J].公路工程,2009,34(4):89-93.
[4]叶爱君,范立础.桥梁抗震(第二版)[M].北京:人民交通出版社,2011.
[5]徐秀丽.大型桥梁结构减振设计方法研究与应用[D].南京:东南大学,2009.
[6]马涌泉,陈水生.基于屈服强度与支座分布影响的LRB隔振效果研究[J].西安理工大学学报,2011,27(3):373-378.
[7]杜修力,韩强,刘文光.考虑双向耦合非线性的LRB隔震桥梁地震反应分析[J].工程力学,2008,25(3):73-79.
[8]戴公连,李德建.桥梁结构空间分析设计方法与应用[M].北京:人民交通出版社,2001.
[9]JTG/T B02—01—2008,公路桥梁抗震设计细则[S].
[10]吴彬,庄军生,臧晓秋.铅芯橡胶支座的非线性动态分析力学参数试验研究[J].工程力学,2004,21(5):144-149.
[11]王志强.隔震桥梁分析方法与设计理论研究[D].上海:同济大学,2000.
[12]王丽,闫维明,阎贵平.铅芯橡胶支座参数对隔振桥梁动力响应的影响[J].北京工业大学学报,2004,30(3):304-308.
[13]骆红军.桥梁结构安全监测的动力响应法与评估系统[J].公路工程,2011,36(3):66-69.
[2]Tan R Y,Huang M C.System identification of a bridge withlead-rubber bearings[J].Computers and Structures,2000,74(3):267-280.
[3]李程,张念来.铁路钢桁拱桥减隔震支座设计参数的优化研究[J].公路工程,2009,34(4):89-93.
[4]叶爱君,范立础.桥梁抗震(第二版)[M].北京:人民交通出版社,2011.
[5]徐秀丽.大型桥梁结构减振设计方法研究与应用[D].南京:东南大学,2009.
[6]马涌泉,陈水生.基于屈服强度与支座分布影响的LRB隔振效果研究[J].西安理工大学学报,2011,27(3):373-378.
[7]杜修力,韩强,刘文光.考虑双向耦合非线性的LRB隔震桥梁地震反应分析[J].工程力学,2008,25(3):73-79.
[8]戴公连,李德建.桥梁结构空间分析设计方法与应用[M].北京:人民交通出版社,2001.
[9]JTG/T B02—01—2008,公路桥梁抗震设计细则[S].
[10]吴彬,庄军生,臧晓秋.铅芯橡胶支座的非线性动态分析力学参数试验研究[J].工程力学,2004,21(5):144-149.
[11]王志强.隔震桥梁分析方法与设计理论研究[D].上海:同济大学,2000.
[12]王丽,闫维明,阎贵平.铅芯橡胶支座参数对隔振桥梁动力响应的影响[J].北京工业大学学报,2004,30(3):304-308.
[13]骆红军.桥梁结构安全监测的动力响应法与评估系统[J].公路工程,2011,36(3):66-69.
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