高烈度区斜拉桥横向约束方案优化分析

为了确定强震作用下斜拉桥合理的横向抗震约束体系，以可克达拉大桥为工程背景，采用非线性时程分析法，分析了4种横向约束体系即横向滑动体系、全限位体系、位移相关型减震体系和速度相关型减震体系对强震区大跨度桥梁地震响应的影响，重点对钢阻尼器的屈服荷载和黏滞阻尼器的位置及相关参数进行优化分析，并与其他体系的地震响应进行了对比。结果表明：在强震作用下，对于大跨度桥梁横向滑动体系和全限位体系均不是理想的抗震体系；而在墩梁、塔梁之间设置减隔震装置可以有效减少横桥向的墩梁、塔梁的相对位移及地震剪力和弯矩；然而，从桥梁正常使用的角度来看，塔梁之间布设横向钢阻尼器装置优于黏滞阻尼器装置。

Optimal analysis of the lateral constraint systems for cable-stayed bridge in high intensity region

In order to determine the reasonable lateral seismic constraint system of cable-stayed bridge under strong earthquake, the nonlinear time history analysis method was used to analyze the seismic responses of long-span bridge with four lateral connection systems based on the Ke-Ke-da-la bridge . The impact of four constraint systems including transverse sliding system,fixed system,and seismic isolation system adding displacement dependent and velocity-related type on the yield load of steel dampers and the viscous dam-per position and relevant parameters were investigated and the seismic responses were compared with other systems. The results indicated that ,for large span bridge, the transverse sliding system and whole limit system were not ideal seismic system under the action of earthquake; seismic isolation device could significantly reduce the bottom of the pier and the tower seismic shear force and bending moment.However, in typical circumstance, transverse steel damping device was superior to the viscous dampers between tower and beam.