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以杭州钱江铁路新桥主桥(45+65+14×80+65+45)m预应力混凝土连续箱梁为工程背景,利用有限元软件Midas/civil建立有限元模型。采用非线性时程分析方法计算设置粘滞性阻尼器前后墩底反力和墩顶位移的变化,从而评价粘滞性阻尼器对提升桥梁抗震性能的作用。结果表明:粘滞性阻尼器的合理设置可以减小制动墩内力,提升高速铁路长联大跨连续梁的抗震性能。
Taking the 45 × 65 + 14 × 80 + 65 + 45) m prestressed concrete continuous box girder of Hangzhou Qianjiang Railway New Bridge as the engineering background, a finite element model was established by using the finite element software Midas / civil. Nonlinear time history analysis was used to calculate the changes of bottom reaction force and displacement at the top and bottom of the viscous damper before and after the viscous damper to evaluate the effect of the viscous damper on the seismic performance of the bridge. The results show that the reasonable setting of viscous dampers can reduce the internal forces of brake pier and enhance the seismic performance of continuous beams with long span and long span of high-speed railway.