水泥混凝土桥面铺装力学行为数值分析

Numerical analysis about mechanical behavior of concrete bridge deck pavement

摘要:

为了分析桥面铺装层的力学特性及其影响因素,结合桥面铺装的结构形式建立了有限元模型,分析了不同水平制动力系数、铺装上下面层材料模量组合及铺装层厚度变化对铺装层内力学状态的影响规律．结果表明,不同的水平载荷对铺装层内的主应力影响较小,而对铺装层内的剪应力影响较大;随着水平载荷的增加,铺装层及防水粘接层内的最大剪应力呈线性增大的趋势;随着铺装层组合模量的提高,铺装层内的主应力变化较小,而层间剪应力相应减小,但变化的幅度较小;增加铺装层的厚度对主应力的影响很小,随着厚度的增加层间最大剪应力减小．研究结果可为桥面铺装材料的选择和结构设计提供理论参考．

Abstract:

A finite element model combined with bridge deck pavement structural style is established to analyze mechanical properties and influence factors of bridge deck pavement structure. The effect of different levels braking force coefficients, top and bottom layer material modulus combination of bridge deck pavement, deck pavement thickness variation are analyzed.Results show that different horizontal loads have little effect on principal stress but much effect on shear stress inside the pavement layer. With the increase of horizontal load, the maximum shear stresses inside pavement layer and waterproof adhesive layer increase linearly.Principal stress inside the pavement layer changes little, while shear stress between layers decreases in a small amplitude with the increase of combination modulus of pavement layer.Increase of the thickness of pavement layer has little effect on principal stress and maximum shear stress between layers decreases with increase of thickness.Conclusions obtained by this paper can be used to provide theoretical reference for material selection and structure design of bridge deck pavement.