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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。
In the current code, longitudinal reinforcement design of continuous reinforced concrete pavement (CRCP) does not consider the temperature field completely. The maximum temperature difference at the depth of reinforcement does not take into account the influence of plate thickness and reinforcement location. The temperature gradient and the thermodynamic properties The relationship is not clear. In view of these deficiencies, based on the structure and related meteorological data of “Tan-Tan Expressway”, based on the heat transfer and thermoelasticity mechanics, the FORTRAN language is used to define the subroutine of heat flow and outside temperature, and the ABCP High temperature and low temperature seasons. The calculated temperature is verified by the measured temperature. The influence of the thickness, the location of the reinforcement and the thermodynamic properties of the material on the maximum temperature and the temperature gradient are analyzed. The influence of the maximum temperature difference on the longitudinal reinforcement is calculated. The main conclusions are as follows: the temperature gradient is periodic; the maximum temperature gradient decreases with the increase of plate thickness; the maximum temperature difference decreases with the increase of embedment depth of reinforcement, and the index of reinforcement decreases. The influence of concrete thermal conductivity on positive temperature gradient obvious.