连续配筋混凝土路面温度应力分析

Analysis of Thermal Stress for Continuously Reinforced Concrete Pavement (CRCP)

基于钢筋混凝土间粘结滑移的线性和非线性本构关系,建立了连续配筋混凝土路面(CRCP)在温度荷载作用下的力学模型以及按接触理论推导的有限元刚度矩阵。得出了考虑粘结滑移线性和非线性本构关系的有限单元数值解,据此分析了降温荷载作用下路面应力、位移的分布规律。同时讨论了裂缝间距和配筋率、配筋方式对裂缝宽度的影响。结果表明,在相同的降温荷载作用下,随着裂缝间距的增大,钢筋和混凝土的应力呈现非线性增加;采用不同配筋方式对裂缝宽度的影响较大,建议设计时尽量采用小直径多根数的配筋方式。按接触有限元法进行温度应力的非线性分析,为今后的科研和设计提供了很好的理论依据。

Based on the linear and the nonlinear bond-slip constitutional relation between reinforced steel bar and concrete, the calculation model for CRCP under thermal stress was established and the stiffness matrix based on the contact theory was derived. The finite element numerical solution based on the linear and nonlinear bond-slip relation was obtained. The distribution pattern of stress and displacement in CRCP under thermal load was analyzed. The results indicate that, the stress of steel and concrete increase nonlinearly with the increasing of cracking space at the same temperature decreasing load condition; it has great influence on the cracking width using different reinforcing type, and the little diameter reinforcement type are advised to use in the design. The contact FEM is clear for calculation and the formula provided is easy to analyze the thermal stress in CRCP, it can provide a reference for design and research in the future.