旧混凝土桥沥青铺装层结构与材料性能研究  

Study on Structure and Material Properties of Asphalt Pavement for Old Concrete Bridge

作　　者：燕立柱 王宏畅[1] 黄九达 YAN Li-zhu;WANG Hong-chang;HUANG Jiu-da(College of Civil Engineering,Nanjing Forestry University,Nanjing Jiangsu 210037,China)

机构地区：[1]南京林业大学土木工程学院,江苏南京210037

出　　处：《公路交通科技》2023年第10期153-160,共8页Journal of Highway and Transportation Research and Development

基　　金：住房和城乡建设部科技项目(2012-K4-21);江苏省交通运输厅科技项目(2010Y34);中国交通运输部部省联合攻关项目(2010-353-332-100)。

摘　　要：为提升桥面铺装结构的使用性能,改善桥面铺装结构层受力状态,减少旧混凝土桥梁维修改造桥面沥青铺装的病害,掌握铺装结构层受力状况及材料的性能,优选出沥青铺装材料和铺装结构型式。采用有限元分析方法,建立了水泥混凝土桥面沥青铺装层有限元基准模型。选择铺装层层间剪应力、层间拉应力、表面剪应力作为主要力学控制指标,分析了不同铺装层厚度和模量在行车荷载作用下铺装层内部的应力变化规律。结果表明:剪切破坏是桥面沥青铺装层主要破坏形式,沥青铺装层厚度是影响铺装层内部应力分布的主要因素,而沥青铺装层材料模量对应力分布影响很小,合适的沥青铺装层厚度有利于改善其内部应力的分布,由此提出2种桥面铺装结构设计方案——SMA组合结构和AC组合结构;通过室内试验,对所选的SMA-10,SMA-13,AC-13这3种沥青混合料进行高温稳定性、低温抗裂性、水稳定性以及渗水性相关路用性能试验研究,可知3种沥青混合料各项性能指标都满足设计规范要求,但在不同的性能上各有其优劣;最后根据性能试验分析结果和桥面铺装材料的优选原则,在性能都满足工程要求的情况下,结合工程造价经济和桥梁结构安全的要求,推荐AC组合结构作为旧混凝土桥面铺装结构,选择AC-13作为旧混凝土桥面铺装上下面层铺装材料。In order to improve the performance of bridge deck pavement structure,improve the stress state of bridge deck pavement structure layer,reduce the disease of old concrete bridge asphalt pavement,grasp the stress state of bridge deck pavement structure layer and material performance,the asphalt pavement material and pavement structure are optimized.Based on the finite element analysis method,the finite element model of asphalt pavement on cement concrete bridge deck is established.The interlaminar shear stress,interlaminar tensile stress and surface shear stress are selected as the main mechanical control indicators,and the stress variation rule of different thickness and modulus of pavement layer under traffic load is analyzed.The result shows that(1)Shear failure is the main failure form of asphalt pavement on bridge deck,and the thickness of asphalt pavement is the main factor affecting the stress distribution inside the pavement,while the modulus of asphalt pavement material has a little effect on the stress distribution.The proper thickness of asphalt pavement can improve the distribution of internal stress,therefore,2 kinds of bridge deck pavement structure design schemes,SMA composite structure and AC composite structure are proposed.(2)Based on the indoor test,the high-temperature stability,low-temperature crack resistance,water stability and water permeability of SMA-10,SMA-13 and Ac-13 asphalt mixtures are studied,it is known that all performance indicators of the 3 asphalt mixtures meet the requirements of the design code,but each has its own advantages and disadvantages in different performance.(3)Finally,according to the results of the performance test and the principle of optimizing the material of the bridge deck pavement,under the condition that the performance can meet the requirements of the project,combined with the requirements of the project cost economy and the safety of the bridge structure,a composite structure is recommended as the old concrete bridge deck pavement structure,AC-13 is select

关 键 词：桥梁工程 铺装结构设计 有限元分析 混凝土桥面铺装 路用性能 

分 类 号：U416[交通运输工程—道路与铁道工程]