锈蚀钢筋混凝土柱承载力退化机理

西安科技大学 建筑与土木工程学院,陕西 西安 710054

箍筋; 锈蚀; 混凝土柱; 轴压承载力

Bearing capacity degradation mechanism of corrosive-reinforced concrete column
CHEN Shao-jie,REN Jian-xi,LI Qiang

(College of Civil and Architectural Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)

stirrup; corrosion; concrete column; axial-compression bearing capacity

DOI: 10.13800/j.cnki.xakjdxxb.2018.0113

备注

为研究锈蚀钢筋混凝土柱的承载力退化机理,利用约束混凝土柱的受力特征,引入钢筋锈蚀参数,充分考虑锈蚀后混凝土截面损伤情况和受压纵筋屈曲行为,建立了箍筋锈蚀混凝土柱承载力模型,并与箍筋锈蚀混凝土柱承载力试验结果进行对比。结果 表明:混凝土柱峰值应力随着箍筋锈蚀率增大有较大幅度减小,应变值略有升高,但受影响程度较小; 箍筋约束能够提高混凝土核心区的承载力,约束效果随锈蚀率的升高而减弱; 箍筋锈胀导致的混凝土保护层裂缝和截面损伤是承载力下降的主要原因,而非锈蚀率; 对比试验结果,模型能够较准确计算承载力。

To investigate the bearing capacity degradation mechanism of corrosive-reinforced concrete,by restricting concrete column mechanic characteristics,introducing corrosive stirrup parameters and taking into full account damage condition of corrosive-column cross-section and buckling behavior of compressive reinforcing bars,the corrosive-stirrup concrete column axial-compression bearing capacity model was established.The results were compared with the test results of the bearing capacity of concrete column.The results show:concrete-column peak stress significantly decreases with increase of the stirrups corrosion rate,the strains tend to increase with less affected; stirrup restrain improves the bearing capacity of the concrete-column cores,the restraint effects decrease as the corrosion rate increases; the concrete cover cracks and cross-section damages caused by stirrups corrosion and expansion are main reason for the bearing capacity decrease,but not corrosion rate; compared with the experiment results,the bearing capacity can be more reliably calculated with the model.