【摘要】 采用车-桥系统相互作用的计算模型,对连续梁桥竖向有载自振频率进行了推导计算,并计算了当20辆相同参数的提速客车通过3×64 m铁路栓焊下承式连续钢桁梁桥、3×40 m铁路上承式连续钢板梁桥以及40 m+4×72 m+40 m部分预应力混凝土连续箱形梁桥时,车-桥系统的竖向有载自振频率。结果表明,当桥上满布车辆时,连续梁桥的竖向有载自振频率呈周期性变化,并且有载自振频率与无载自振频率的最大偏差随梁本身质量的增大而减小。更多还原

【Abstract】 The continuous bridge vertical loaded free frequency is calculated with the vehicle-bridge system model. The vertical loaded free frequencies of the 3×64 m through stud welding steel truss bridge and the 3×40m deck plate steel girder bridge and the 40 m+4×72 m+40 m party pre-stressed concrete continuous box-girder bridge are calculated, when 20 high-speed passenger vehicles with the same parameters are traveling on the bridges. The results show that when the vehicles are distributing over the whole bridge, the continuous bridge vertical loaded free frequency is periodically varied, and the girder~,s mass is heavier, the difference between the loaded free frequency and the free unloaded frequency is smaller.更多还原