【摘要】 结合合福铁路古田溪特大桥主跨(60+2×100+60)m连续梁设计方案,分别建立了相应的空间有限元模型,对比分析了3种模型的自振特性。采用桥梁结构动力分析程序BDAPV2.0进行车桥动力仿真,针对高桩承台以及桩-土相互作用对桥梁和车辆的振动性能的影响进行了研究。对比分析表明:高桩承台及桩-土相互作用使桥梁结构的自振频率降低,且不同模型下,桥梁跨中和墩顶的横向位移和加速度也有差异;考虑桩-土相互作用的全桩模型能比较真实地反映车辆荷载作用下桥梁的横向振动特性,而采用墩底固结模型进行动力仿真分析会产生较大误差。更多还原

【Abstract】 Combined with the design schemes for the main span (60+2×100+60) m continuous beam of Gutianxi Bridge on Hefei-Fuzhou railway, the corresponding spatial finite element models are established and the vibration characteristics of the models are comparatively analyzed. Moreover, the bridge structure dynamic analysis program BDAP V2.0 is used to simulate train-bridge dynamic performance and analyze the influence of high-rise pile cap and pile-soil interaction on the vibration performance of bridge and train. Comparative analysis shows that high-rise pile cap and pile-soil interaction can drop natural frequency of the bridge structure and the transverse displacement and acceleration in the middle of span and on the top of pier have significant differences under three models. The whole pile model considering pile-soil interaction can truly reflect transverse vibration performance of the bridge under train loads, while dynamic simulation with the pier bottom consolidation model will produce a great error.更多还原