锈蚀钢筋混凝土柱开裂机理及滞回性能研究

Study on Cracking Mechanism and Hysteretic Behavior for Corroded Reinforced Concrete Columns with Large-eccentricity Compression

基于锈蚀钢筋混凝土偏心受压构件承载力试验研究结果,运用ansys有限元分析软件对锈蚀钢筋混凝土大偏心构件进行了分析,通过温度场来模拟钢筋锈蚀作用,得到锈蚀构件破坏特征及承载力随锈蚀程度的变化规律,对比试验结果,数值计算结果能较好与之吻合。随着锈蚀率的增加,偏心柱开裂区不断扩大。同等条件下,随着钢筋直径的增加,钢筋锈胀力减小,开裂区减小。通过对偏心柱在不同锈蚀率下滞回曲线、骨架曲线以及耗能能力的分析表明,用温度场模拟钢筋锈胀力对混凝土偏心柱的作用可取得令人满意的结果。

Based on the bearing capacity experiments of corroded reinforced concrete eccentric compressive components,the computation model for corroded reinforced concrete was put forward by ANSYS software and taking temperature field to simulate the corrosion effect of steel bar.The bearing capacity variation and the failure crack distribution with corrosion degree are consistent with experimental results.The crack area of eccentric column expands with the increase of corrosion rate,and the corrosion expansion force and the crack area reduces with the increase of bar diameter under the same conditions.The analysis on the hysteretic curves,skeleton curves and energy dissipation capacity of the eccentric columns under different corrosion rate show that the simulation of corroded steel bar expansion force by temperature field is reasonable.