【摘要】 为了评估重载铁路桥梁的技术状态,对朔黄铁路子牙新河特大桥进行了动力试验。利用冲击振动试验法识别桥墩横向自振频率以及梁体横向和竖向自振频率。动力试验中,通过测试运营列车作用下梁体控制截面的梁体振幅和加速度的响应,并将突测结果与《铁路桥梁检定规范》规定的限值比较。结果表明,梁体各项动力参数指标均满足规范要求,这说明梁体结构的运营性能良好。该桥部分桥墩之前进行过加固,为了评估加固前和加固后桥墩结构的动力性能,试验选取典型桥墩进行动力测试分析。比较加固前后桥墩振动参数的变化情况。评估结论可验证桥墩加固效果,为其余桥墩是否需要加固提供数据支持。更多还原

【Abstract】 In order to estimate the technical status of heavy load railway bridge,Ziyaxin River Bridge in Shuohuang Heavy Load Railway is dynamically tested.The impact vibration test method is used to distinguish the transverse natural vibration frequency of bridge pier,and the transverse and vertical natural vibration frequencies of girder.In the dynamic test,the measured result is compared with the limit value stipulated in Railway Bridge Inspection Specifications by the test of the girder amplitude of girder control section and the response of acceleration under the operation action of train.The result shows that various dynamic parameter indexes of girder all satisfy the requirements of the specification,and illustrates the good operation function of girder structure.The partial piers of this bridge have been reinforced.In order to estimate the dynamic performance of pier structure before and after reinforced,the typical pier is selected to carry out the dynamic test analysis in the test The change conditions of pier vibration parameters before and after reinforced are compared.The estimation conclusion can validate the pier reinforcement effect,which can provide the data support for whether or not to reinforce the rest piers.更多还原