ABSTRACT
In order to improve the mechanical performance of the continuous structure of the steel-concrete composite simply-supported beam bridge, a new structural form in which the continuous concrete layer of the variable-section simply-supported steel beam bridge deck under the form of a flat-head cover beam is proposed. The finite element simulation analysis was carried out for the parameters such as the span, the length of the unbonded section at the continuity of the bridge deck, and the thickness of the continuity of the bridge deck, etc. The deformation and stress characteristics of the continuous structure of the bridge deck under the structure are studied, and the continuous failure mechanism of the bridge deck is discussed. The results show that: the smaller the span, the smaller the maximum tensile stress at the continuity of the bridge deck; Compared with the maximum tensile stress of the continuous unbonded section of the bridge deck of 3.5m, 3.0m and 2.5m, the former is the smallest; According to models 4 and 6, compared with 280mm, the continuous thickness of the bridge deck is 240mm, and the tensile stress at the continuous structure of the bridge deck is reduced by 38.18%. From the finite element calculation results, the optimal span, unbonded length and the thickness of the continuous structure of the bridge deck can be determined, which reduces the longitudinal tensile stress of the continuous concrete on the bridge deck and can effectively improve the cracking problem of the continuous concrete on the bridge deck.
