连续配筋混凝土路面横向裂缝传荷作用的数值模拟和敏感性分析  

Numerical Simulation and Sensitivity Analysis on Load Transfer of Transverse Crack in Continuously Reinforced Concrete Pavement

作　　者：赵纪飞[1,2] 叶建龙 王骁帆 刘朝晖[4] 李盛[4] ZHAO Ji-fei;YE Jian-long;WANG Xiao-fan;LIU Zhao-hui;LI Sheng(School of Geological Engineering and Surveying, Chang＇an University, Xi＇an Shaanxi 710054, China;POWERCI-IINA Northwest Engineering Corporation Ltd. , Xi＇an Shaanxi 710054, China;Zhejiang Provincial Institute of Communications Planning, Design and Research, Hangzhou Zhejiang 310006, China;State Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science and Technology, Changsha Hunan 410004, China)

机构地区：[1]长安大学地质工程与测绘学院,陕西西安710054 [2]中国电建集团西北勘测设计研究院有限公司,陕西西安710054 [3]浙江省交通规划设计研究院,浙江杭州310006 [4]长沙理工大学公路养护技术国家工程实验室,湖南长沙410004

出　　处：《公路交通科技》2018年第6期1-7,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51678078;51178062);湖南省教育厅科学研究项目(14B001);湖南省研究生创新项目(CX2015B352);公路养护技术国家工程实验室开放基金项目(kfj150102)

摘　　要：国内现行的水泥混凝土路面规范在对连续配筋混凝土路面(CRCP)进行配筋设计时,忽略了横向裂缝的传荷作用,现有研究对传荷作用影响因素的敏感性分析也不够全面具体。针对这些不足,分析了横向裂缝的传荷机理;运用ABAQUS有限元软件建立了CRCP的带裂缝数值模型;运用等效面积原理,将单轮接触面积简化为矩形,在横向裂缝边缘施加等效荷载,对某实体工程进行了力学响应计算;利用Grovetti和Zollinger的经验公式对裂缝传荷效率(LTE)的有限元解进行了验证;通过敏感性分析,确定了筋材种类、基层刚度、纵向配筋率、地基反应模量和横向裂缝宽度等因素对CRC板层底拉应力分布和LTE的影响。计算结果表明:在横向裂缝两侧设置剪切刚度弹簧单元可以较好地模拟传荷作用;绘制了CRC板在车辆荷载作用下的应力和应变云图;得出了该实体工程的LTE为89.73%、传荷性能评级为优的结论;钢筋、BFRP筋和GFRP筋对应的LTE分别为89.73%,88.11%和87.73%;大刚度基层、半刚性基层和柔性基层对应的LTE分别为92.32%,89.73%和89.47%;直径8,16 mm和24 mm对应的LTE分别为87.77%,89.73%和92.55%;地基模量50,100 MPa和150 MPa对应的LTE分别为89.73%,91.82%和99.04%;裂缝宽度0.2,0.5 mm和0.8 mm对应的LTE分别为94.40%,89.73%和86.49%。Whilst performing the reinforcement design of CRCP, the current specification of China for cement concrete pavement ignores the load transfer of transverse crack. Very few researches on the sensitivity analysis of influencing factors of load transfer are being perfect and comprehensive as well. Aiming at these problems, we analyzed the load transfer mechanism of transverse crack, and constructed the numerical model of CRCP with crack using the ABAQUS FE software. The touching area of wheel tire is simplified as a rectangle area using equivalent area principle, and the tire load is exerted on the edge of transverse crack for mechanical response calculation of an engineering example. The FE result of load transfer efficiency （LTE） is verified by Grovetti and Zollinger empirical formulas. We also carried out the sensitivity analysis to determine the effect of reinforcement type, base modulus, longitudinal reinforcement ratio, foundation reaction modulus and transverse crack width on the bottom tensile stress of CRC slab and load transfer coefficient. The result shows that （ 1 ） the spring elements with shearing stiffness can be used at both sides of transverse crack to simulate load transfer in an efficient way; （2） the strain and stress contours of CRC slab under vehicle load are drawn, showing that the LTE of this project is 89.73% and its load transfer level is excellent; （3） the LTE of steel rebar, BFRP bar and GFRP bar is 89.73% 88.11% and 87.73% respectively; （4） the LTE of strong rigid base, simi-rigid base and flexible base is 92. 32%, 89.73% and 89.47% respectively; （5） the LTE ofS, 16 mm and 24 mm steel diameter is 87.77% , 89.73% and 92.55% respectively; （6） the LTE of 50, 100 MPa and 150 MPa foundation modulus is 89.73%, 91.82% and 99.04% respectively; （7） the LTE of 0.2 ram, 0. 5 mm and 0. 8 mm crack width is 94.40% , 89.73% and 86.49% respectively. In general, this research seeks to offer theoretical reference for the structural design of road engineering and help promot

关 键 词：道路工程 连续配筋混凝土路面 有限元 裂缝传荷效率 层底拉应力 

分 类 号：U416.222[交通运输工程—道路与铁道工程]