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基于时程分析法,借助大型有限元计算程序,以四川某超高墩大跨部分曲线连续刚构桥为背景,对该桥进行了自振特性及地震反应分析,对比研究了同条件下部分曲线桥与直线桥的抗震性能的差异,对左右幅之间的横向联系对结构整体刚度的贡献及对结构整体抗震性能的影响也进行了相应研究。研究结论表明:该类结构的曲线线形对自振频率的影响较少,其结构刚度主要受制于桥墩,若在左右幅之间增设横向联系,将在很大程度上改善结构的受力;该类结构的抗震性能受主梁与桥墩二者刚度比值的影响较明显,当二者刚度比值处于合理范围时能有效的降低结构位移动力响应,有利于结构的抗震;此外,桥墩的高度对结构的动力稳定性的影响较大,随着桥墩高度降低,结构动力稳定性越趋于稳定。
Based on the time-history analysis method and the large-scale finite element program, taking the long-span continuous rigid frame bridge with a large span of an ultra-high pier in Sichuan as the background, the natural vibration characteristics and seismic response analysis of the bridge are analyzed. The difference of seismic performance between curved bridge and straight-line bridge, the contribution of transverse connection between the left and right web to the overall stiffness of the structure and the influence on the overall seismic performance of the structure are also studied. The results show that the curve shape of this kind of structure has less influence on the natural frequency and its structural rigidity is mainly controlled by piers. If horizontal connection is established between the left and right webs, the stress of the structure will be greatly improved. The seismic performance of the quasi-structure is affected by the stiffness ratio of the main girder and the piers. When the stiffness ratio of the two is within a reasonable range, the dynamic response of the structure can be effectively reduced, which is in favor of the seismic resistance of the structure. In addition, The dynamic stability of the impact of larger, with the pier height decreases, the structural stability of the more stable.