Determination of Allowable Differential Settlement between Bridge Abutment and Approach Embankment with Five-degree-of-freedom Vehicle Model

A bump develops when there is differential settlement between a bridge abutment and an approach embankment. The determination of the allowable differential settlement is important for the design and maintenance of the bridge approach, so it is studied theoretically in this paper. Because the longitudinal roughness in the bridge approach is much more serious than that in general highway sections, the pitch movement of vehicles cannot be ignored. One adds rider and seat to a half-truck model to build a five-degree-of-freedom vehicle model. The dynamic response analysis to Man-Vehicle-Road system passing over the bridge approaches with and without approach-relative slopes are carried out by means of the Laplace transform. Comparative calculations show that much difference will be produced in the maximum transient vibration value of the acceleration and the vibration frequency when different vehicle models are used. So it is more reasonable to use the five-degree-of-freedom vehicle model than to use the three-degree-of-freedom vehicle model for the determination of the allowable differential settlement. After all the required parameters are determined, the allowable differential settlement can be obtained by trial calculations.

並列關鍵字

Bridges approach ； Differential settlement ； Maximum transient vibration value ； Vehicles

國際替代計量

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