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以1/4面板结构模型程序为基础,考虑基层与面板的摩擦界面作用,开展了足尺路面板结构的三维早龄期翘曲有限元数值模拟研究,并与现场实验进行校验。对比显示,相比1/4面板模型,考虑基层摩擦接触界面的全面板模型程序板角位移计算值减小,日变化量级、趋势与试验监测结果更为接近,面板-基层界面参数对计算迭代收敛性影响较大。不同的工况组合下,由于早龄期的历程效应路面板会产生很多复杂的行为特征,计算仿真显示面板早龄期存在板角-1/4板中-板中的翘曲变形迁移运动,不同条件的边界约束导致演化形成不对称面板翘曲。在夏季28 d的记忆-松弛-记忆多次叠加历程作用下,路面板一般将产生正的固化温度差性状。由于混凝土早龄期行为的复杂性,早龄期数值模拟技术仍需研究模型优化、材料早龄期参数特性以及施工工艺的影响。
Based on the 1/4-panel structure model program, considering the friction interface between the base and the panel, a three-dimensional warhead finite element numerical simulation of the full-scale pavement structure was carried out and verified with field experiments. The comparison shows that compared with the 1/4-panel model, the calculated value of the angular displacement of the full-panel model in considering the frictional contact interface at the grass-roots level is smaller and the magnitude of diurnal variation is closer to the monitoring result. Iterative convergence of greater impact. Due to the combination of different working conditions, the pavement slab will have a lot of complex behavioral characteristics due to the course effect of the early age. The calculation and simulation show that there is a warping deformation and migration movement in the slab angle-1/4 slab- Boundary constraints of different conditions lead to the evolution of asymmetric panel warping. During the 28 days of summer, the pavement slab generally produces a positive solidification temperature difference under the action of memory-relaxation-memory multiple stacking. Due to the complexity of behavior in early age of concrete, numerical simulation of early age still needs to study the influence of model optimization, material characteristics of early age and construction technology.