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隔震连续梁桥与邻梁较易发生碰撞并造成损伤,完善的减隔震设计应将碰撞效应考虑在内,以更好地保护梁体。以某城市轨道交通系统三跨连续梁桥为例,建立了该桥及相邻简支梁桥的空间有限元分析模型,采用非线性时程分析方法计算了不同工况中应用摩擦摆支座(FPS)进行减隔震设计后,隔震连续梁桥与相邻简支梁桥梁体的碰撞响应,探讨了梁端间隙、FPS主要设计参数对梁间碰撞响应的影响以及碰撞对隔震连续梁桥地震响应的影响。研究结果表明,同时考虑两端碰撞时,通过增大梁端间隙、减小支座等效滑动半径或增大支座摩擦系数的方式均可有效减少梁端碰撞发生的次数,虽无法保证梁间碰撞力同时减小,但是从效应累积角度考虑,仍然认为是有利于减弱梁间碰撞效应的。其中,增大梁端间隙或支座摩擦系数对碰撞效应的影响规律相似且减弱效果较为明显,减小支座等效滑动半径的效果次之。在设计中可主要通过适当增大摩擦摆支座摩擦系数和梁间间隙的手段来减小梁间碰撞效应。
Isolated continuous girder bridges and adjacent girders are more likely to collide with each other and cause damage. A complete design of reducing the seismic isolation should take into account the impact effects to better protect the girders. Taking a three-span continuous girder bridge of an urban rail transit system as an example, a space finite element analysis model of the bridge and adjacent simple girder bridge is established. By using the nonlinear time history analysis method, the friction pendulum bearing (FPS), the impact responses of the isolated continuous girder bridge and the adjacent simply supported girder bridge body are studied. The influence of the beam end clearance, the main design parameters of FPS on the collision response between the girders and the impact of the collision on the continuous isolation Influence of Beam Bridge Earthquake Response. The results show that the number of collisions at the beam ends can be effectively reduced by increasing the clearance at the beam end, reducing the equivalent sliding radius of the bearing or increasing the friction coefficient of the bearing, The collision force decreases at the same time, but from the perspective of cumulative effect, it is still considered to be beneficial to reduce the collision effect between beams. Among them, the effect of increasing the beam end clearance or bearing friction coefficient on the collision effect is similar and the weakened effect is obvious, and the effect of reducing the equivalent sliding radius of the bearing is followed. In the design, the collision effect between beams can be reduced mainly by appropriately increasing the friction coefficient of the pendulum bearing and the gap between the beams.