钢-混凝土组合桥面板的钢筋布置优化设计研究

Study on Optimization of Reinforcement Arrangement in Steel-concrete Composite Bridge Deck

摘要:

以某城市高架桥梁为算例，针对钢-混组合桥面板中的配筋问题，建立闭口钢箱-混凝土桥面梁段的实体有限元模型，分析混凝土桥面板中的纵横向钢筋在不同间距的排布情况下，钢桥面板与钢筋的应力分布情况。结果表明，钢桥面板与混凝土桥面板之间存在内力相互分配的关系，横向钢筋间距的变化会影响组合桥面板的内力分配比例；桥面板下排的纵向钢筋应力水平始终较低，且对钢筋间距变化不敏感，可适当进行优化设计，减少其用量。

Abstract:

Taking an urban elevated bridge as an example, aiming at the problem of reinforcement arrangement in steel-composite bridge deck, the solid finite element model of beam section of closed steel box-concrete bridge deck is established. The stress distribution between the steel bridge deck and the steel bar in the concrete bridge deck under different spacing arrangement of vertical and horizontal rebar is analyzed. The research shows that the internal force distribution relationship exists between steel bridge deck and concrete bridge deck. The variation of transverse reinforcement spacing will affect the internal force distribution ratio of composite bridge deck. The stress of the longitudinal reinforcement bars in the lower row of the bridge deck is always low, and it is not sensitive to the change of reinforcement bar spacing, which can be properly optimized and designed to reduce its dosage.