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为研究高烈度区域内,抗震支座对曲线连续梁桥的减震性能,采用有限元软件Midas Civil 2015分别建立设置普通橡胶支座与高阻尼橡胶支座的全桥三维模型,采用加速度峰值修正的EI Centro波作为地震动输入,对同样地震力作用下,桥梁结构的位移和内力响应进行对比分析,并采用弯矩-曲率曲线对其减震效果进行研究。分析结果表明,设置高阻尼橡胶支座能够有效地改善桥梁墩顶位移与墩身、桩身内力,抗震支座对横向位移减小效果明显,且由于改变了全桥的刚度分布,使得普通支座模型中承受较大弯矩的矩形墩内力大幅度减小,全桥内力趋于合理化。
In order to study the seismic reduction of curved continuous girder bridges in high seismic intensity region, the finite element software Midas Civil 2015 was used to establish the full-bridge three-dimensional model with normal rubber bearings and high damping rubber bearings respectively. The acceleration peak correction EI Centro waves as input of ground motion, the displacement and internal force response of bridge structure under the same seismic force are compared and analyzed. The bending moment-curvature curve is used to study the damping effect. The analysis results show that setting high damping rubber bearing can effectively improve the displacement of top of bridge piers and the internal forces of piers and piles. The effect of anti-seismic bearing on transverse displacement is obviously reduced. Because of changing the stiffness distribution of the whole bridge, In the model, the internal forces of rectangular piers subjected to large bending moment are greatly reduced, and the internal forces of the full bridge tend to be rationalized.