超高性能轻型组合桥面铺装体系基本力学性能研究  

Research on Basic Mechanical Property of Super High-performance Lightweight Composite Deck Pavement System

作　　者：李嘉[1] 王懿[1,2] 李洪[1,3] 邵旭东[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]林同棪国际工程咨询(中国)有限公司,重庆401121 [3]贵州省交通规划勘察设计研究院股份有限公司,贵州贵阳550081

出　　处：《公路交通科技》2015年第7期55-61,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51178177);交通运输部重大科技专项(2011318494160)

摘　　要：为解决大跨径钢桥面疲劳开裂和铺装层早期损坏这两大难题,提出薄层聚合物混凝土(TPO)铺筑于超高韧性混凝土(STC)-钢桥面板的超高性能轻型组合桥面铺装体系。基于马房大桥的有限元模型,分析STC+TPO铺装体系的受力和变形特点。计算结果表明:采用STC+TPO铺装体系,钢桥面板中的拉应变平均降幅达76.4%,铺装层中的拉应变峰值和竖向位移峰值降幅均大于49.0%;此外,车辆荷载、环境温度和铺装层厚度等对STC+TPO铺装体系的受力状况有较大影响,60℃时STC-TPO界面抗剪强度可达2.56 MPa;STC+TPO铺装体系能大幅提高桥面系刚度,降低铺装层和桥面板的应力应变幅值,从而减小桥面板和铺装层疲劳开裂的风险;同时,STC和TPO的抗拉强度及界面抗剪强度均满足重载和高温环境下的使用要求。In order to solve the problems of fatigue cracks in steel deck and early damage in deck pavement of long-span bridge, the thin polymer overlay （TPO） is proposed to form a high-performance lightweight composite deck paving system on super toughness concrete （STC） steel deck. Based on the finite element model of Mafang Bridge, the stress and deformation of the STC ＋ TPO pavement system are studied. The calculation result indicates that （ 1 ） the tensile strain in the steel deck decreased by 76. 4% on average, both the maximum tensile strain and vertical displacement of the pavement decreased by more than 49.0% ; （2） the stress status of the STC ＋ TPO pavement system are greatly influenced by vehicle load, environment temperature and pavement thickness ; （3） the shear strength of interface between STC and TPO is more than 2.56 MPa at 60 ℃ ; （4） STC ＋ TPO pavement system could greatly increase the stiffness of the bridge deck system and reduce the stress and strain amplitudes in both pavement and steel deck, thus it could reduce the risk of fatigue cracking; （5） the STC and TPO could easily withstand tensile stress or shear stress under the conditions of heavy loads or extreme high temperature.

关 键 词：桥梁工程 桥面铺装 力学计算 轻型组合桥面 超高韧性混凝土 聚合物混凝土 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]