Mechanics Analysis About Several Problems Of Asphalt Paving On Steel Bridge

With the rapid development of the transportation industry of our country, a large campaign of building bridges has been launched during recent years. Among the finished bridges until now, the structural form of box girder with longitudinal stiffeners is not only more and more adopted in the long span suspension bridges and stable bridges, but is also applied in the short-middle span bridges. At the same time, much more importance is attached to the deck pavement made of asphalt mixture which is rather related with the comfort of driving and the safety of bridges. However this problem of steel deck paving still has not been solved satisfactorily. Additionally, many more new circumstances arise from the engineering practices which are not proved by theories until now. This article dealt with the two exceptional circumstances in the designing and building of deck pavement, trying to give satisfied interpretation.In order to find out the effect brought by the tension of cables, this part of the article used the hierarchical analytical method to first start with the mechanical analysis of the whole bridge, trying to find out the most dangerous part under the tension of cables and the load of vehicle. Secondly, those other nodes'vertical comparative displacements were educed from the maximal nodal vertical comparative displacement which was measured before ,the vertical displacements were exerted to the nodes on the most dangerous part as boundary conditions, thus the nodal displacements on several certain lines which would be looked as boundaries of the orthotropic deck were calculated. In the last step, the orthotropic deck model was picked up from the dangerous part of the girder model, and the calculated displacements were exerted to the nodes on the new and more accurate orthotropic deck model. Thus the mechanical performances of the pavement under the deformation of the deck or under the wheel loads could be studied. Additionally, the critical comparative vertical displacement was suggested which would obviously reduce the fatigue life of the material, to give reference to the engineering circle.In the next place, to find out the performance of the pavement on the steel deck with the steel bars above as well as the capability of this pavement to resist the adverse effect aroused by the crooked slope. The second part tried to study the mechanical performances of the special pavement structure. This chapter first studied the laws of the stress and strains at the surface of this special paving structure, then the results were compared with the results of common paving structure. Secondly the chapter tried to find out the most dangerous locations on the pavement of wheel load which would have the most negative effect on the pavement. It also did contact analysis between the pavement and deck. At last, this chapter discussed the relations between the mechanical indexes of the pavement and the parameters of the structure.