Abstract:In order to provide a theoretical basis for the vibration reduction design of ballast track on bridge in environment sensitive area, a spatial coupling dynamical model for a vehicle-ballast track-bridge system was established based on the finite element method. Based on the model, time-frequency characteristics of dynamic responses of track and bridge with and without laying ballast mat were analyzed. In addition, the proper rigidity value of the ballast mat was investigated. The results show that the ballast mat can provide obvious vibration absorption effect that the dynamic responses of bridge evidently decreased, where the vibration level of pier can be decreased with 3~9dB. And the adoption of the ballast mat does not aggravate wheel-rail dynamic interaction or affect the running safety of trains. Furthermore, vibration of track structures also can be decreased, especially for the ballast bed. Proper rigidity value of ballast mat is suggested to be from 100 to 150 MPa/m with the comprehensive consideration of vibration absorption effect, ballast bed acceleration and compression of ballast mat.
谭诗宇,蔡小培,崔日新,井国庆. 环境敏感区桥上有砟轨道铺设道砟垫的减振效果[J]. 振动与冲击, 2017, 36(10): 38-44.
Tan Shi-yu,CAI Xiao-pei,CUI Ri-xin,JING Guo-qing. Vibration Reduction Effect of Laying Ballast Mat under Ballast Track on Bridge in Environmental Sensitive Area. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(10): 38-44.
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