STRESS AMPLITUDE ANALYSIS OF ORTHOTROPIC STEEL BRIDGE DECK WITH PAVEMENT

FE models of steel box girder and deck-U rib joint were established． The boundary conditions of the deck- U rib joint FE model were interpolated from the steel box girder model using submodeling technology． The effect of pavement was considered in FE models． The co-stressing behaviors of pavement and steel bridge deck under the wheel load were analyzed． The influence of the elastic modulus，thickness and Poisson ratio of pavement were discussed． The result showed that increasing the thickness and elastic modulus of pavement could reduce stress range of the joint significantly． The stress range of deck detail was not reduced obviously with the increase of Poisson ratio． In practical projects，the local stress of deck detail could be reduced by increasing the pavement's thickness to the steel bridge deck with thin deck． The materials as SFＲC which have large elastic modulus and small temperature influence were suggested as pavement structure．