混凝土中钢筋锈胀过程的计算机仿真分析

基于混凝土中的钢筋锈胀损伤机理，提出一种采用温度膨胀环代替锈蚀产物的模拟方法，通过温度膨胀模拟锈蚀产物的体积膨胀作用，通过膨胀环厚度的增大模拟钢筋锈蚀的发展过程，通过变化温度膨胀环的温度膨胀系数，可以考虑不同锈蚀产物的影响，通过变化膨胀环的形状可以模拟混凝土中钢筋不均匀锈蚀，为混凝土中钢筋锈胀损伤机理的研究提供了一种有效方法，对保护层厚度、钢筋半径、钢筋位置、不同间距相邻钢筋对钢筋锈胀力的影响规律进行了计算分析，计算表明，保护层厚度和钢筋半径之比上影响混凝土中钢筋锈胀力的重要因素，且相邻钢筋锈蚀的附加影响不容忽视。

Simulation Analysis of Cover Splitting Process Due to Expansion Action of Corrosion

Based on the theory of cover splitting due to steel corrosion,the splitting process of concrete cover due to the volume expansion action of corrosion products has been investigated by use of inner expanding band.Increasing the thickness of the expanding band simulates the propagation of corrosion,and increasing element temperature of the expanding band simulates the expansive action of corrosion.In addition,varying temperature expansion coefficient can simulate the effect of different corrosion products,and varying the shape of expanding band can simulate the uneven corrosion.The numerical model provides a tool that may be used to develop a better understanding of the mechanisms of damage propagation due to corrosion of the reinforcement.The cover thickness,the bar radius,the steel position were varied,the influence of the neighboring steel were studied by varying the reinforcing steel bar spacing.It is found that the cover-to-bar-radius ratio is important parameter against corrosion cracking;the additional effect of the corrosion of the neighboring steel should be taken into account.