连梁装置游间量设置对弯桥动力特性的影响

基于某两联曲线弯桥建立了计算模型，分析其在罕遇地震作用下碰撞反应特性，明确了该曲线弯桥的动力响应机制.基于梁间连梁拉索装置的设置，研究游间量对曲线弯桥动力特性的影响.研究表明：地震波的频谱特性对曲线弯桥碰撞反应影响显著，在远场地震作用下，梁间碰撞频率增大，但碰撞冲击力减小；随着连梁装置游间量的增大，游间量值对连梁拉索轴力的影响减弱，对梁间碰撞力的影响增强，梁间碰撞力增大，但碰撞次数基本无变化；游间量对墩底塑性开展影响显著，随着游间量的减小，曲率延性需求系数降低，较无连梁装置时减少62.5%.

Influence of expansion joint setting on the dynamic characteristics of curved bridges with unseating-prevention devices

A finite element model was built for a curve bridge with an unseating-prevention device. The collision effect of the curved bridge under rare earthquake was studied and the dynamic response mechanism was discussed based on this finite element mod-el. The influence of expansion joint setting on the dynamic characteristics of the curved bridge was analyzed. It is found that the spec-tral characteristics of seismic waves have significant effect on the collision effect, and the collision frequency between the adjacent frames increases under far field earthquake, while the collision force decreases. When the expansion joint increases, the effect on the axial force of the unseating-prevention device weakens, the collision force increases, but the collision times are basically unchanged. The expansion joint significantly affects the plastic development of the pier bottom. The curvature ductility demand reduces with decreasing expansion joint, and more than 62. 5% drops compared that without the expansion joint.