典型铁路简支箱梁的中高频振动试验研究

发布时间：2019-05-13 10:18

【摘要】：以城际铁路32m双线、单线混凝土简支箱梁和高速铁路32m双线混凝土简支箱梁为研究对象,采用现场试验方法,对箱梁各板件在列车作用下的中高频振动响应进行测试分析。将测试结果与其他混凝土简支箱梁和U梁的试验值比较,讨论混凝土简支箱梁各板件中高频振动的影响因素。研究表明:混凝土简支箱梁各板件的中高频振动分布在200Hz以下,最大振动速度级主要出现在31.5~80 Hz频带;峰值振动主要由车轮-轨道系统固有频率决定,同时,与轴距相关的加载频率和板件的局部振动模态将影响中高频振动响应;板件尺寸、约束条件、振动传递路径决定中高频振动响应的大小,U梁的振动响应比更高运营速度下的箱梁大;等截面简支梁各横截面位置在列车通过时段内的总速度级没有明显差异。
[Abstract]:Taking the 32m double line, single line concrete simply supported box girder and 32m double line concrete simply supported box girder of intercity railway as the research objects, the middle and high frequency vibration response of each slab of the box girder under the action of the train is tested and analyzed by using the field test method. The test results are compared with the experimental values of other simply supported concrete box girder and U beam, and the influence factors of high frequency vibration in each slab of concrete simple supported box beam are discussed. The results show that the middle and high frequency vibration of each slab of concrete simply supported box beam is below 200Hz, and the maximum vibration velocity level mainly occurs in the frequency band of 31.5 ~ 80 Hz. The peak vibration is mainly determined by the natural frequency of the wheel-track system. At the same time, the loading frequency related to the wheelbase and the local vibration mode of the plate will affect the medium-high frequency vibration response. The vibration response of the U beam is larger than that of the box beam with higher operating speed, and the size of the plate size, the constraint condition and the vibration transfer path determine the response of the high frequency vibration of the U beam. There is no significant difference in the total speed level of each cross section position of the simply supported beam with equal cross section during the train passage period.
【作者单位】：西南交通大学土木工程学院;
【基金】：国家自然科学基金(51378429) 四川省教育厅科研项目(16ZA0009) 中央高校基本科研业务费(2682016CX022)
【分类号】：U446.1

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