Design and verification of the similarity model in the test of a ballastless track box-girder system

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (14) : 219-227.

LUO Kun1,WANG Zhenguo2,LEI Xiaoyan1,ZHANG Xinya1

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Abstract

In order to explore the applicability of the similarity law of elastic force in the similarity model design of a ballastless track box girder system for vibration tests, the coupling similarity between multi-layer structures and their models was analyzed theoretically.It is found there is coupling effect between layers with different material properties.Then, according to the similarity law of elastic force, the similarity model of the ballastless track box-girder system was made with a scale of 10 ∶1.Through free modal test and finite element numerical analysis, the correctness of the similarity theory and the model was verified.The results show that: when the geometric dimension of a structural layer in the direction of load is much larger than that of other structural layers, the similarity relationship derived from the material properties of the structural layer is approximately equal to the coupling similarity relationship between the prototype and the model, the similarity model of the ballastless track box-girder system can be designed according to the similarity law of elastic force, for deriving the similarity relationship it needs only to do in accordance with the material property of the box-girder, and the similarity model can reflect the vibration state of the prototype structure accurately, with the maximum error of 4.02%.

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ballastless track box-girder / similarity law of elastic force / vibration test / similarity model / coupling similarity

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LUO Kun,WANG Zhenguo,LEI Xiaoyan,ZHANG Xinya. Design and verification of the similarity model in the test of a ballastless track box-girder system[J]. Journal of Vibration and Shock, 2021, 40(14): 219-227

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