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建立某曲线刚构-连续组合梁桥的空间有限元计算模型,在桥梁活动支座部位设置粘滞阻尼器,进而考虑曲率半径的变化,计算分析了结构在3条3向地震动作用下曲率半径变化对结构反应以及粘滞阻尼器减震效果的影响。结果表明:不添加阻尼器的曲线梁桥的动力反应不仅与曲线桥的曲率半径有关,而且还跟地震动特性有关;添加粘滞阻尼器后控制点内力在不同地震动作用下均随着曲线桥曲率半径的增大而增大;粘滞阻尼器对于曲线桥控制点内力和主梁位移的减震率在不同地震动作用下均随曲线桥曲率半径的增大而减小。为粘滞阻尼器在不同半径曲线梁桥上的应用提供了理论指导。
The finite element model of a curved rigid-continuous composite girder bridge is established. The viscous damper is set on the movable bearing of the bridge, and then the variation of the radius of curvature is taken into account. The curvature of the structure under three 3-direction ground motions is calculated and analyzed. Effect of Variation of Radius on Structural Response and Shock Absorption of Viscous Damper. The results show that the dynamic response of the curved beam bridge without dampers is not only related to the curvature radius of the curved bridge, but also to the characteristics of ground motion. The internal forces of the control points after adding the viscous damper are different under different ground motions. The curvature radius of the bridge increases, and the damping force of the viscous damper to the control points of the curved bridge and the displacement of the main girder decreases with the increase of the radius of curvature of the curved bridge under different ground motions. It provides theoretical guidance for the application of viscous dampers on curved bridge with different radius.