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建立双支承曲线连续梁桥的空间有限元模型和减震控制动力仿真模型,根据连续梁桥的支座布置在各活动支座的切向设置8组磁流变阻尼器,在纵桥向输入3种不同频谱特点的地震动,计算分析了曲线连续梁桥地震反应主动控制、半主动控制和被动控制方法的减震效果。结果表明,磁流变阻尼器能够有效地减小曲线梁桥的主梁切向位移和固定墩墩底的弯矩与扭矩。不同频谱特点地震动输入下磁流变阻尼器减震效果的差别较大,在设计曲线梁桥减震参数时需要合理选择地震动输入。总体上看,磁流变阻尼器主动控制、半主动控制和被动控制3种减震控制方法对于曲线连续梁桥大部分地震反应减震效果的差别较小,这可为简单易行的阻尼器耗能被动控制方法在曲线梁桥抗震减震设计中的广泛应用提供理论依据。
The space finite element model and damping control dynamic simulation model of continuous girder bridge with double support curves are established. According to the arrangement of continuous girder bridge, 8 sets of magnetorheological damper are arranged in the tangential direction of each movable bearing, Three kinds of ground motions with different spectral characteristics are analyzed and the seismic effects of active response control, semi-active control and passive control method are calculated and analyzed. The results show that the MR damper can effectively reduce the tangential displacement of the girder and the moment and torque at the bottom of the fixed pier. The difference of damping effect of MR damper with different frequency spectrum characteristics is larger. It is necessary to select the ground motion input reasonably when designing the damping parameters of curved beam bridge. Overall, the three kinds of damping control methods of active control, semi-active control and passive control of MR damper are less different for most of the seismic response of curved continuous girder bridges, which is a simple and easy damper The passive control method of energy dissipation provides a theoretical basis for the wide application of the seismic girder design in curved beam bridges.