连续配筋水泥混凝土路面的温度翘曲应力研究

Temperature Warping Stress Study on Continuously Reinforced Concrete Pavement

摘要:

通过素混凝土板温度翘曲应力的Westergaard理论解和有限元数值解的对比,论证了素混凝土板计算模型的适用性,得到了板体自重对板的温度翘曲应力不产生影响这一重要结论.以三向弹簧模拟钢筋和混凝土之间的粘结,对素混凝土板中加入钢筋前后板体特征点位的温度翘曲应力变化情况作了计算分析,认为配筋层位、粘结刚度系数、温度梯度、板长、板厚及配筋率等参数对板中加入钢筋前后温度翘曲应力变化值的影响可以忽略.结果表明,Winkler地基模式下连续配筋路面单独板的温度翘曲应力可以沿用与其尺寸一致的普通水泥混凝土板的温度翘曲应力计算方法.

Abstract:

Temperature warping stress of plain concrete plate calculated by Westergaard formula and finite element method (FEM) was comparatively analyzed.It demonstrates the applicability of plain concrete plate model,and an important conclusion is drawn that body weight produces no effect on warping stress.Based on threedirection spring simulating the bondslip relation between steel and concrete,warping stress alteration of feature points before and after reinforcement was calculated.Influence of the following parameters on the change of warping stress before and after reinforcement could be neglected,such as reinforced layer location,bondslip stiffness coefficient,temperature gradient,plate length,plate thickness and reinforcement ratio.The results show that temperature warping stress calculation method of separate plate of continuously reinforce concrete parement (CRCP) under Winkler foundation is the same as its size of ordinary Portland cement concrete slab.