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本文在总结前人研究成果的基础上,首先以某六跨简交直梁铁路曲线桥为对象,用各种地基弹簧模拟地基土的弹性抵抗作用,分别假定支座处为固定,弹性和活动连接,按空间结构分析了不同半径时该桥的动力特性与地震响应,与直线桥进行了比较。并用脉动法测试了实际桥梁的动力特性,得到了与理论分析较一致的结果。分析和实验的结果表明,对于小半径的多跨长桥,曲率半径对桥梁的自振特性和抗震性能有较大影响有在进行桥梁的抗震设计时加以考虑的必要。该影响的主要特点是: 梁墩之间的连系越强,曲线桥和直线桥在动力性能上的差别就越大;
On the basis of summarizing the research results of predecessors, this paper first takes the curved bridge of a certain 6-span cross-beam railway as an object and simulates the elastic resistance of the foundation soil by using various foundation springs. It is assumed that the support is fixed, flexible and movable According to the spatial structure, the dynamic characteristics and seismic response of the bridge with different radii are analyzed, which are compared with the straight-line bridge. The pulsating method was used to test the dynamic characteristics of the actual bridge. The results were consistent with the theoretical analysis. The results of analysis and experiment show that for small radius long span bridges, the radius of curvature has great influence on the natural vibration characteristics and seismic performance of the bridge. It is necessary to consider the seismic design of the bridge. The main characteristics of the impact are: the stronger the connection between beam pier, the greater the difference in dynamic performance of curved bridge and straight bridge;