基于有限元方法的桥面铺装结构应力响应分析

Stress Response Analysis of Bridge Deck Pavement Structure Based on Finite Element Method

摘要

为明确水平荷载与垂直荷载耦合作用下水泥混凝土桥面铺装的力学响应规律，为防水黏结层技术要求制定提供理论支撑，采用 ABAQUS 有限元软件建立 T 形梁桥面铺装三维模型，系统分析水平力系数对铺装层间剪应力、层内剪应力、拉应力和拉应变的影响。结果表明：水平荷载对铺装层间纵向剪切影响显著，远大于横向；车辆加减速及紧急刹车使沥青铺装上层层内最大剪应力增幅达94％，且最大剪应力峰值从4cm深度上移至铺装层顶面；沥青铺装上层纵向拉应力、拉应变分别增幅433％、335％，成为横向裂缝始发区域，研究揭示了水平荷载对桥面铺装受力状态的恶化机制。

Abstract

To clarify the mechanical response law of cement concrete bridge deck pavement under the coupling action of horizontal and vertical loads，and to provide theoretical support for formulating technical requirements for waterproof bonding layers，a three-dimensional model of T-beam bridge deck pavement was established using ABAQUS finite element software.The effects of horizontal force coefficients on interlayer shear stress，intralayer shear stress，tensile stress，and tensile strain of pavement layers were systematically analyzed.The results show that horizontal loads exert a significant influence on the longitudinal shear between pavement layers，which is far greater than that on transverse shear.Vehicle acceleration，deceleration，and emergency braking increases the maximum intralayer shear stress of the upper asphalt pavement layer by 94％，and the peak value of the maximum shear stress shifts upward from a depth of 4 cm to the top surface of the pavement layer.The longitudinal tensile stress and tensile strain of the upper asphalt pavement layer increase by 433％and 335％， respectively，making it the initiating area of transverse cracks.This study has revealed the deterioration mechanism of horizontal loads on the stress state of bridge deck pavement.

关键词

桥梁工程 / 应力响应规律 / 有限元分析 / 荷载耦合 / 防水黏结层

Key words

bridge engineering / stress response law / finite element analysis / load coupling / waterproof bonding layer

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基金资助

2024年度郑州市优秀青年科技人才项目(桥面铺装防水黏结层黏结质量轻量化智能检测设备开发)

＂科创中原＂行动青年人才托举工程项目(2023HYTP013)

河南省交通运输厅科技项目(2020J-2-10)