基于ANSYS的双层配筋CRCP温度翘曲应力数值分析

Simulation Analysis of the Bilayer Reinforcement CRCP’s Temperature Warping Stress Based on ANSYS

本文以实测数据为基础,运用ANSYS有限元仿真软件,针对实际工程特定结构,分别从配筋和裂缝两个方面分析双层配筋CRCP温度翘曲应力。研究结果表明:由于裂缝的影响,双层配筋CRCP混凝土最大温度翘曲应力位于板中板宽方向,其值远小于屈服强度;随着配筋率的增加,双层配筋CRCP混凝土温度翘曲应力在板长方向增大,板宽方向变化不大,板长影响显著;改变配筋方式,钢筋间距的影响较钢筋直径的影响大;单、双层配筋形式对混凝土翘曲应力的影响不大;裂缝的形成与双层配筋CRCP混凝土温度翘曲应力关系密切;裂缝间距越大,混凝土翘曲应力越大;裂缝宽度越大,混凝土翘曲应力越小;通过NOLA计算法分析双层配筋CRCP纵向钢筋温度应力,发现纵向钢筋主要承担温缩应力,温缩应力占90%以上,温度翘曲应力的影响很小,可以忽略。

The paper based on the measured data and the specific structure of the site,ANSYS finite element simulation software was used to analyze the temperature warping stress of bilayer reinforcement CRCP from the aspects of steel bar and crack respectively.Research results show that due to the influence of cracks,the warping stress of the maximum temperature of bilayer reinforcement CRCP concrete is located in the width direction of the plate,which is much smaller than the yield strength.With the increase of reinforcement ratio,the temperature warping stress of bilayer reinforcement CRCP concrete increases in the lengthwise direction,and the width of the slab changes little,and the length of the plate is significantly affected.The same is to change the reinforcement ratio,the impact of reinforcement spacing greater than the diameter of steel.Single and double reinforced forms have little effect on concrete warpage stress.The formation of cracks is closely related to the temperature warping stress of bilayer reinforcement CRCP concrete.The greater the crack spacing,the greater the concrete warpage stress;the greater the crack width,the smaller the concrete warpage stress.Through the NOLA calculation method,it is found that the longitudinal reinforcement of bilayer reinforcement CRCP is mainly responsible for the temperature-shrinking stress,and the temperature-shrinkage stress accounts for over 90% of the stress.The influence of temperature warping stress is small and negligible.