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铅芯橡胶支座对非规则匝道桥抗震性能的影响
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Abstract:
为研究铅芯橡胶支座对非规则匝道桥抗震性能的影响，本文依托工程实例建立有限元模型，通过弹塑性时程分析方法，对比研究板式橡胶支座和铅芯橡胶支座在非规则匝道桥中的抗震作用，并对不同纵向坡度和曲率半径下铅芯橡胶支座的减震效果进行探讨。研究结果表明：桥墩采用铅芯橡胶支座后，其墩顶位移响应值基本不变，但内力响应值显著减小，各桥墩刚度比值的改变使得固结墩地震响应值小幅增大；铅芯橡胶支座的减震幅度随着纵向坡度的增大而增大，且对矮墩的减震效果明显大于高墩；随着曲率半径的增大，铅芯橡胶支座减震效果小幅减小。铅芯橡胶支座在曲率半径较小、桥墩较矮的非规则匝道桥中减震效果明显。
In order to study the influence of lead rubber bearing on the seismic performance of irregular ramp bridge, a finite element model is established based on an engineering example. The seismic performance of plate rubber bearing and lead rubber bearing in irregular ramp bridge is analyzed, and the damping effect of lead rubber bearing under different longitudinal slope and radius of curvature is discussed. The results show that the displacement response value at the top of the pier is basically unchanged but the internal force response value is significantly reduced. The change of stiffness ratio of each pier makes the seismic response of the consolidated piers increase slightly. The damping amplitude of lead rubber bearings to short piers is larger than that to high piers, and increases with the increase of longitudinal slope. With the increase of radius of curvature, the damping effect of lead rubber bearing decreases slightly. The lead rubber bearings have an obvious shock absorption effect in irregular ramp bridges with a small radius of curvature and short piers.
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