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运用有限元软件SAP2000,对等墩高、对称和非对称三种高墩某连续刚构桥纵桥向进行不同地震强度水平非线性时程分析,得到各模型纵桥向线性地震反应规律。通过对比三种模型可知,等墩高模型各墩纵桥向基本为一致振动,地震力分配模式最优,对称模型和非对称模型由于墩高相差较大,各墩振动不一致,故各墩地震力分配相差较大。为使各墩振动趋于一致,使各墩质量、刚度趋于平衡,采用活动盆式支座加钢悬臂梁弹塑性阻尼器的方法来调整对称模型和非对称模型各墩刚度,利用一系列的设计流程达到高墩桥梁减震设计的目的。
Using the finite element software SAP2000, the nonlinear time history of different longitudinal stiffness of a continuous rigid frame bridge with high pier, symmetrical and asymmetrical piers is analyzed, and the linear seismic response of each model is obtained. By comparing the three models, it can be seen that the vertical bridge direction of each pier in the pier with equal pier model is basically the same, and the distribution pattern of the earthquake force is optimal. Because of the large difference in pier height and the inconsistent vibration of piers in the symmetrical model and the asymmetric model, The distribution of force is quite different. In order to make the vibration of the piers be consistent and the mass and rigidity of each piers are balanced, the rigidity of the symmetrical and asymmetrical model piers is adjusted by the movable basin type bearing and steel cantilever beam elasto-plastic damper, The design flow reaches the goal of high-pier bridge damping design.