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针对现行规范关于连续配筋混凝土路面(CRCP)纵向配筋的计算公式存在缺陷,且横向裂缝平均宽度控制值也不够合理的问题,采用弹性理论分析了温缩和干缩作用下CRCP的应力和位移,推导了纵向配筋设计指标的计算公式。结合“潭耒高速”算例,并基于CRC板二次开裂的主动控制,提出了确定横向裂缝宽度合理控制值的计算方法。采用ABAQUS有限元软件,对解析公式进行了数值验证。设计正交试验,对纵向配筋设计参数进行了极差分析和方差分析。根据极差分析,对设计参数的敏感性进行了排序;根据方差分析,区分了各设计参数在不同置信水平下的显著程度。结果表明:潭耒高速的横向裂缝宽度控制值可取为0.6mm;有限元建模时,弹簧单元可以模拟钢筋与混凝土之间的黏结-滑移本构关系,干缩可以等效为当量温差;解析解与有限元解较为吻合;混凝土线膨胀系数和温降幅值是最重要因素,钢筋直径和剪切刚度系数为较重要因素;研究成果可为CRCP的纵向配筋设计和施工提供理论参考。
In view of the fact that the calculation formula of the longitudinal reinforcement of the continuous reinforced concrete pavement (CRCP) is deficient and the control value of the average width of the transverse cracks is not reasonable enough, according to the current code, the stress and temperature distributions of CRCP under temperature and shrinkage shrinkage Displacement, deduced the calculation formula of longitudinal reinforcement design index. Combined with the example of “Tanhuo Expressway”, and based on the active control of CRC secondary cracking, a method to determine the reasonable control value of transverse crack width was put forward. The ABAQUS finite element software was used to verify the analytical formula. Orthogonal experiments were designed to analyze the range and variance of longitudinal reinforcement design parameters. According to the range analysis, the sensitivity of the design parameters are sorted. According to the analysis of variance, the significance of each design parameter under different confidence levels is distinguished. The results show that the control value of transverse crack width in Tanhuan high speed can be taken as 0.6mm. In the finite element modeling, the spring element can simulate the bond-slip constitutive relation between steel bar and concrete, and the shrinkage can be equivalent to equivalent temperature difference. The analytic solution is in good agreement with the finite element method. The linear expansion coefficient and the temperature drop amplitude of concrete are the most important factors. The diameter and shear stiffness coefficient of rebar are the most important factors. The results can provide theoretical reference for the longitudinal reinforcement design and construction of CRCP.