西堠门大桥3种梁端约束体系比较

Comparison of Three Kinds of Girder End Constraint Systems for Xihoumen Bridge

为限制地震作用下加劲梁的梁端位移以及使梁体不对伸缩缝作用过大的速度以免损害伸缩缝,计划对舟山大陆连岛工程西堠门大桥设置梁端约束装置。通过全桥模型的地震反应非线性时程分析,从抗震角度对梁端自由、梁端设置液体粘滞阻尼器以及设置锁定装置3种梁端约束体系下的性能进行比较分析,选定了液体粘滞阻尼器,从保护反力墙,并使其安全系数与阻尼器安全系数匹配的角度确定了粘滞阻尼器的参数。

To restrict the displacement at stiffening girder ends under action of earthquake and to ensure that the girders will not cause too fast movement speed towards the expansion joints lest the joints should be damaged, the constraint devices are intended to provide for the girder ends of Xihoumen Bridge, the Zhoushan Mainland and Islands Link Project. In this paper, based on the nonlinear time history analysis of the seismic response of the overall bridge model, the performances of three kinds of the girder end constraint systems for the bridge, such as the free movement device, liquid viscous damper and lock-up device, are compared and analyzed form the angle of seismic resistance, the liquid viscous device is chosen for the bridge and the parameters for the chosen device are determined from aspect of protecting the reaction walls and matching the safety coefficients of the walls with those of the viscous dampers.