Experimental Research And Simulation Analysis Of Suspension Bridges With Orthotropic Board

With the rapid development of Chinese super large span bridge construction, all kinds of new bridge's constructive techniques are being applied to transport construction continuously. In the wild world, the floor system of super large span bridge with the main span beyond 600m is usually made of the orthotropic steel deck as top slab of box girder with transverse beam because the orthotropic steel deck has the feature of light weight, high strength and convenient construction. During the various stages of construction, the vehicles and some equipment used in the construction may be allowed to enter the constructive field on the bridge, so the stress state without any protection of bridge deck pavement will be serious under the constructive load. Therefore, it's necessary to research the influence on the safety of steel bridge deck under the temporary load such as constructive equipment and vehicles in order to guarantee the structural safety of steel bridge deck and entire bridge.In this dissertation, applying structural analytic software Midas/Civil to establish the 3D finite element model of orthotropic steel bridge deck of 39F bid section of Baling River Bridge, the detail analysis has been done for the structural mechanical behavior under different load location. The reasons for the influence on stress-strain distribution of structure have been analyzed and the comparative analysis has been made between the static-dynamic load testing data and the calculating results of finite element method so that the conclusion can be drawn that Baling River Bridge can run safely through the verification of testing and calculating data.In this dissertation, in light of the method, content, scheme of static-dynamic test for super large span suspension bridge, the static-dynamic test is done for 1088m main span suspension bridge and the comparative analysis is conducted between the tested stress, strain and flexure of steel truss reinforced girder and calculating values. The results show that the testing values are all smaller than the calculating ones and the verification coefficient for stress is between 0.81 and 1.00, which demonstrates that the strength of section may satisfy the requirement of design and code. Through the analysis of mechanics, stress-strain, deformation, the suspension bridge may satisfy the command of safe usage.