温度场对连续配筋混凝土路面纵向配筋的影响  

Effect of Temperature Field on Longitudinal Reinforcement of Continuously Reinforced Concrete Pavement

作　　者：王骁帆 应正兵 刘朝晖[2] 苏颖奇 李盛[2] 

机构地区：[1]浙江省交通规划设计研究院,浙江杭州310006 [2]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》2017年第4期16-24,57,共10页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51678078;51178062);湖南省自然科学基金项目(14JJ7041);湖南省教育厅科学研究项目(14B001);公路养护技术国家工程实验室开放基金项目(kfj150102);湖南省研究生科研创新项目(CX2015B352)

摘　　要：现行规范对连续配筋混凝土路面(CRCP)进行纵向配筋设计时,对温度场考虑不全面,钢筋埋深处的最大温差未考虑板厚和配筋位置的影响,且温度梯度与材料热力学性质的关系也不明确。针对这些不足,依据"潭耒高速公路"的结构和相关气象数据,以传热学和热弹性力学为基础,用FORTRAN语言定义了热流和外界温度的子程序,用ABAQUS模拟了CRCP的高、低温季节温度场,并用实测温度对计算进行验证,分析了板厚、配筋位置和材料热力学性质对最大温差、温度梯度的影响,计算了最大温差的减小对纵向配筋的影响。主要结论有:温度梯度具有周期性;最大温度梯度随板厚增加而减小;最大温差随钢筋埋置深度的增加而减小,配筋指标随之减小;混凝土热传导率对正温度梯度影响明显。Temperature field is not fully considered for the longitudinal reinforcement design of CRCP in current specification.Whilst determining the maximum temperature drop at the depth of steels,it ignores the primary factors involving slab thickness and the reinforcement position,and the relationship between temperature gradient and thermo-dynamical properties of pavement materials is not clear for design purpose.Aiming at these problems,the subroutine of both heat flux and ambient temperature which come from the structure of Xiangtan-Leiyang expressway and related meteorological data are defined in terms of theories of heat transfer and thermo-elasticity by using FORTRAN language.The temperature fields of CRCP for both summer and winter are simulated by ABAQUS,and then the calculated temperature field is verified by comparing with the measured data.The influence of slab thickness,reinforcement position,and thermodynamical properties of pavement materials on the maximum temperature drop and the temperature gradient are discussed.The effect that results from the decrease in the maximum temperature drop on the longitudinal reinforcement is calculated.Significant conclusions can be drawn as follows：（1） the temperature gradient is featured with periodicity;（2） an increased thickness of CRCP slab leads to a decrease in the maximum temperature gradient;（3） the maximum temperature drop decreases when the steels are placed in the deeperposition,which leads to the decrease in reinforcement indictors;（4） the thermal conductivity of concrete has a great effect on positive temperature gradient.

关 键 词：道路工程 连续配筋混凝土路面 有限元 配筋设计 温度场 

分 类 号：U416.222[交通运输工程—道路与铁道工程]