Analysis On Mechanical Properties Of Steel Bridge Deck And Pavement

In recent years, China has built a number of long-span bridges. Orthotropic steel panel has a light component quality, transportation and erection of convenient, short construction period, making the long span suspension bridge and the cable-stayed bridge all use extravagant system of orthotropic steel bridge and asphalt mixture as a bridge deck system. As a background of the Huangshi material improvement project, collected information literature about deck pavement materials test data, as well as a number of bridge deck pavement repair or repeated repair program, combined with the composite material mechanics theory to analyze the general characteristics of the steel bridge deck pavement mechanics, this paper attempts to find new ideas to reveal the stress-strain state of the pavement layer. Considering various factors, this paper summarizes the current pavement design control index. Through the analysis of4kinds of common pavement design control index, and the actual test data, combined with the investigation data and data in the literature, the article explores the control indexes of pavement layer parameter relationship, as a reference for the design of bridge deck pavement.The test has carried out in Huangshi laboratory, when the author participated in Huangshi materials engineering. According to the three kinds of pavement mixture that:pouring type asphalt mixture, SMA mixture and epoxy asphalt mixture, the author has made the high temperature test and the low temperature performance test. Using the ANS YS finite element software to establish the model of beam section of bridge deck pavement, the author have a indicator of distribution, and simply analysis the relationship of the asphalt material stiffness modulus and the deck steel plate thickness. Finally, the author draws the following conclusions.1﹑The effects of load position is very small on the maximum tensile stress in box beam central, but with the load position relative to the U rib location associated with relatively large. Then load position I will be the most disadvantageous position. The effects of load position is very large on the maximum tensile stress near wash plate, but with the load position relative to the U rib location associated with relatively small. Then the most disadvantageous position generally is above diaphragm or mid-span. The horizontal shear stress of bonding layer is greater than the longitudinal shear stress. Then the most disadvantageous position generally is load position I on mid-span. Considering the maximum displacement on deck surface, the most disadvantageous position generally is load position I. Considering the minimum curvature radius on deck surface, the most disadvantageous position in box beam central generally is load position I on mid-span and the most disadvantageous position near wash plate is load position II.(The center which is stiffening rib edge is loading position I and the center which is between two adjacent stiffener is Load position II)2﹑The effects of stiffness modulus and deck steel plate thickness is large on steel bridge deck pavement control index influence. When the stiffness modulus increases, the maximum tensile stress and the maximum shear stress and the minimum curvature radius become large, the maximum relative displacement will become small. When the deck steel plate thickness increases, the maximum tensile stress and the maximum shear stress and the maximum relative displacement become small, the minimum curvature radius will become larger.