基于弹塑性力学与断裂力学的钢筋临界锈胀力对比分析

Analysis for Critical Rust Expansion Force of Reinforced Concrete Based on the Elastic-plastic Mechanics and Fracture Mechanics

分别以弹塑性力学理论和断裂力学理论为基础,推导出了钢筋混凝土临界锈胀力的计算公式,并与实验数据和目前常用的几种计算模型进行了比较分析,结果表明:以断裂力学为依据推导的临界锈胀力更加接近真实值,而以弹塑性力学为依据推算的临界锈胀力偏小。因此,在钢筋锈胀引起的混凝土开裂研究中,建议采用断裂力学方法。

Based on the elastic-plastic mechanics and fracture mechanics theory,the formulas for critical rust expansion force of reinforced concrete are deduced.The result is analyzed by experimental data and several calculation models which are in common use.The results show that the critical rust expansion force of reinforced concrete deduced from the fracture mechanics theory is closer to the true value,however,the critical rust expansion force of reinforced concrete deduced from the elastic-plastic mechanics is smaller than the true value.Thus,in the research of concrete cracking caused by reinforcement rust expansion,it is better to use the theory of fracture mechanics.