激振和循环加载下浮置板轨道动力参数试验研究
汪杨鑫1,2练松良1,2朱锦泽1,2陈高峰3
Test and Research on Dynamic Parameters of Floating Slab Track under Impact and Cyclic Loading
WANG YangxinLIAN SongliangZHU JinzeCHEN Gaofeng
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作者信息:1.1. 同济大学道路与交通工程教育部重点实验室， 201804， 上海；
2.2. 上海市轨道交通结构耐久与系统安全重点实验室， 201804， 上海；
3.3. 隔而固振动控制有限公司技术中心， 266108， 青岛
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Affiliation:The Key Laboratory of Road and Traffic Engineering, Ministry of Education, Tongji University, 201804, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2021.07.026
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中图分类号/CLCN:U213.2+12;U213.2+42
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栏目/Col:研究报告
摘要:
在浮置板轨道结构的设计、施工、使用中，需要通过试验测试其动力参数。通过对钢弹簧浮置板轨道结构进行激振测试和循环加载测试，得到了不同试验方法下浮置板轨道结构的自振频率、刚度和阻尼比等动力参数，并分析了不同试验方法的适用性。结果表明：循环加载的低频动刚度与逐级加载的静刚度一致性较好；锤击和落轴的激振荷载均可准确地测得浮置板轨道结构的自振频率；激振和循环加载均可测得浮置板阻尼比。与循环加载相比，激振测试的操作更简便，但其阻尼比受波形峰值间隔的影响较大。建议取3~4个相邻振动峰值时的试验结果，此时激振测试下的阻尼比与循环加载下的阻尼比一致。
Abstracts:
During the design, construction and operation of floating slab track structure, dynamic parameters need to be studied through tests. By conducting impact test and cyclic loading test to steel spring floating slab track structure, the dynamic parameters such as the natural frequency, stiffness and damping ratio of the floating slab under different test methods are obtained respectively, and the applicability of different test methods is analyzed. The results show that the low-frequency dynamic stiffness of cyclic loading is consistent with the static stiffness of progressive loading; the impact load of both hammering impact and dropping wheelset can accurately measure the natural frequency of the floating slab track structure. Both the impact and cyclic loading can measure the damping ratio of the floating slab. Compared to cyclic test, hammering impact operation is more convenient, but its damping ratio is more affected by the number of waveform peak intervals. It is suggested to take test results in 3 to 4 near periods, in which condition the damping ratio of impact test is consistent with that of cyclic loading.
引文 / Ref:
汪杨鑫，练松良，朱锦泽，等.激振和循环加载下浮置板轨道动力参数试验研究[J].城市轨道交通研究，2021，24(7):120.
WANG yangxin，LIAN Songliang，ZHU Jinze，et al.Test and research on dynamic parameters of floating Slab track under impact and cyclic loading[J].Urban Mass Transit，2021，24( 7 )：120.
WANG yangxin，LIAN Songliang，ZHU Jinze，et al.Test and research on dynamic parameters of floating Slab track under impact and cyclic loading[J].Urban Mass Transit，2021，24( 7 )：120.
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