Researching On Mechanical Properties Of Long-Span Suspension Bridge And Cable-Stayed Bridge Deck Surfacing Under Vertical Static Loading

Taking a wide view of the international researching achievements on the long span steel bridges surfacing, It is not difficult to see that people usually analyze the mechanical properties of the surfacing through analyzing the orthotropic steel bridge deck model. But the influence of the bridge deform on deck surface can't be explained in this way. In the paper, the static characteristics of the suspension bridge and the cable-stayed bridge of Runyang were analyzed by using Finite Element Method. To analyze the mechanical characteristics of the bridge pavement, the static characteristics of the bridges were transferred to the model of the orthotropic steel bridge deck through changing the model's boundaries. So from integral to part, the influence of the bridge deform upon deck surface were studied in the paper.Firstly the properties of the suspension bridge and the cable-stayed bridge had been compared, and the mechanics character of the principal girders under the vertical static loading had been summarized. Secondly, the three dimensions models of the suspension bridge and the cable-stayed bridge had been analyzed, then the static characteristics of the bridge were transferred to the model of orthotropic steel bridge deck through the model's boundaries. In this way, the influence of the bridge deform upon deck surface can be studied. Using the hierarchical analytical method, the mechanics of the pavement had been analyzed. The main researches included the following aspects and got the correlative results:The static characteristics of the bridge have effect on the numerical value of the pavement's tension stress. Considering the bridge's mechanical characteristics, the axial tension stress and the horizontal tension stress of the suspension bridge's deck pavement increase while the axial tension stress of the cable-stayed bridge's deck pavement increases only in the mid-span and decreases in the other parts of the span. The calculation data also shows that the maximum axial tension stress of the cable-stayed bridge's deck pavement is greater than the maximum axial tension stress of the suspension bridge's deck pavement. So we can draw the conclusion that, under vertical static loading, the horizontal crack will appear in the cable-stayed bridge's deck pavement first.