高墩桥梁纵桥向减震设计方法研究

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。

Research on Seismic Design of High Pier Bridge in Longitudinal Direction

With finite element software SAP2000,a horizontal nonlinear time history analysis is carried out to measure the intensity of seismic effect on equal,symmetrical and asymmetrical high pier of a continuous rigid frame bridge in longitudinal direction.The longitudinal linear reaction rule of the three models is obtained.As the vibration in longitudinal direction is concordant,the distribution pattern of seismic force on equal high pier is optimal.However,due to the unequal heights of symmetrical and asymmetrical high pier,the vibration is discordant,and the distribution of seismic force is uneven.Hence,to make the vibration concordant and bring the mass and rigidity of every pier into balance,in the thesis,a steel cantilever beam plastic damping device with pot bearing is introduced to adjust the rigidity of symmetrical and asymmetrical high pier,by applying a series design flow,to control the seismic in high pier bridge.