【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。更多还原

【Abstract】 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.更多还原