Research on Assembly Deviation of the Top Slab of Orthotropic Steel Bridge Deck Structure

Orthotropic steel bridge decks are used in long-span bridges due to their structural characteristics. The orthotropic steel bridge decks will have staggered deviation during their assembly process, and stress concentration occurs at the staggered position. We study the fatigue performance and life of the top slab with assembly deviation of the orthotropic steel bridge deck structure. Research is carried out to reduce local stress due to assembly deviation. The results show when the longitudinal joint dislocation on the top slab is welded with slope, the greater the gradient of the weld, and the greater the stress around the weld. When the transverse joint dislocation of the top deck is directly butted, the stress concentration on the lower surface of the joint dislocation is obvious. To reduce fatigue stress, it is feasible to pave 2 cm MPC (modified polymer concrete) composite material above the top slab and then pave asphalt concrete.