Experimental Analysis on Mechanical Performance of U-rib on Orthotropic Steel Bridge Deck

KONG Dandan;SUN Quansheng;DIAO Wanmin;HU Dandan;YU Ying;LIN Tie;School of Civil Engineering, Northeast Forestry University;Heilongjiang Highway Construction Center;

Orthotropic steel bridge deck;;U-rib;;full-scale test;;parametric analysis;;stress;;deflection

In view of the advantages of light weight, large bearing capacity and short construction period of orthotropic bridge deck, this paper takes the design parameters of U-rib in a continuous steel box girder bridge in a city as the research object. Through full-scale model test, the location where the bridge deck is prone to crack and the influence of the change of U-rib section of the steel box girder bridge on the vertical displacement and stress of the whole bridge are studied by finite element simulation. The results show that the U-rib of the continuous steel box girder bridge commonly used in practical engineering is easy to crack, but the steel box girder is not damaged, and only cracks and stress concentration occur at the local weld and arc defects. Then through the finite element simulation of the parameters of the U-rib(U-rib height, U-rib thickness), the parameters of the U-rib are changed, and the deflection and stress of the design size in the full scale model are compared. The comparison results show that the higher the height of the U-rib, the smaller the stress and deflection of the main section, but there is no linear relationship. When the height of the U-rib is 0.28 m and 0.30 m, the mechanical performance is the best. With the increase of U-rib thickness, the stress and deflection of the main section also decrease, and the thickness of the section with the largest decrease is 12 mm. The conclusions of this study can provide ideas for the design of U-ribs in the same type of continuous steel box girder bridges.