The Damage Analysis On The Rigid-flexible Compound Pavement Of The Steel Bridge Deck

Fatigue cracking was one of the main damage forms of pavement structure layer of the steel bridge deck, which was the process of deterioration under transport loads in pavement structure layer essentially. It was more consistent with reality to apply fatigue damage theory to analyze the problem, which was more theoretical value and practical significance. In order to improve and develop the design theory of steel bridge deck, adopted rigid-flexible compound pavement structure——"light polymer modified ceramsite cement mortar + SMA-13", carried out test study to composite structure beam and the materials of every pavement layer and carried out fatigue damage analysis. The purpose of the article was to find the fatigue damage evolution law of light polymer modified ceramsite cement mortar and asphalt mixture in particular environment,and the fatigue damage performance of the rigid-flexible composite bridge deck pavement structure,which was composed of them.Firstly, carried out fatigue test to light polymer modified ceramsite cement mortar, the laws of the cross-displacement and the damage of beam specimen were analysed.Applied continuum damage mechanism, analysed and choosed the fatigue damage evolution model. The fatigue test data was used to verify the correctness of the model and determined model parameters. Fatigue damage being simulated numerically, the distribution law of damage was described.Secondly, carried out fatigue test to asphalt mixture, based on the analysis of asphalt mixture fatigue damage mechanism,combined with the character that the asphalt mixture was a kind of viscoelastic material,choosed reasonabled the fatigue damage evolution model.The fatigue test data was used to verify the correctness of the model and determined model parameters.And furtherly applied the the dissipation energy principle to examine the only correlation between the cumulative dissipation and fatigue life.Finally, based on the study of material properties, a composite pavement structure"light polymer modified ceramsite cement mortar + SMA-13"was brought forward. Carried out composite beam fatigue test to simulate the bridge to examine its anti-fatigue property. Through simulated numerically the fatigue damage, the distribution laws of stress and damage are described.