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| Random vibration analysis of vehicle-pavement-bridge system under vehicle braking |
| Received:May 15, 2008 |
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| DOI：10.7511/jslx20105032 |
| KeyWord:vehicle-pavement-bridge interaction asphalt pavement concrete pavement covariance equivalence elastic supports vehicle brake |
| Author | Institution |
| 殷新锋 |
长沙理工大学土木与建筑学院,长沙 ;湖南大学 土木工程学院,长沙 |
| 方志 |
湖南大学 土木工程学院,长沙 |
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| Abstract: |
| Vehicle, pavement and bridge were considered as an entire system. The vehicle is modeled as a multi-rigid body connected by springs and dampers, the asphalt pavement as a boundless beam on Kelvin foundation and concrete pavement together with underlaid bridge girder as a Euler-Bernoulli beam. The vertical motion equations for the system are formulated by means of the principle of total potential energy with a stationary value in elastic system dynamics and the"set-in-right-position"rule for relating matrices. The covariance equivalence method was used to establish the unsteady random input about action of vehicle wheel. The dynamic response of the coupling system of vehicle-pavement-bridge with elastic supports under the vehicle braking was studied. The results show that when all other parameters but pavement type keep unchanged, the maximum impact factor of the simply supported concrete bridge with span of 50m long and concrete concrete pavement is 1.31 times of that with the asphalt pavement. Besides, the impact factor is influenced significantly by required time during braking and the roughness of pavement surface. |
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