Wang Mingnian, Zhang Yiteng, Yu Li, Dong Yucang, Tian Yuan, Zhou Guojun
Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China.
Materials (Basel). 2019 Sep 5;12(18):2863. doi: 10.3390/ma12182863.
Degradation of the bond between I-shaped steel and concrete due to the corrosion of I-shaped steel significantly affects the durability of steel reinforced concrete (SRC) structures. This study carried out the accelerated corrosion test and push-out test to study the bond-slip behavior and characteristics considering the corrosion of I-shaped steel, and test results indicated that: (1) The performance degradation of the bond-slip accelerated when the corrosion ratio reached 12%. (2) The corrosion failure pattern of SRC experienced slip phase and destruction phase in the rising stage. (3) Based on the principle of minimum potential energy, the bond stress was obtained only with the load and the displacement in the free end and the loading end. (4) Meanwhile, a new bond-slip degradation model was developed using the interface damage theory. Finally, the proposed model agreed with the experimental results.
工字钢锈蚀导致工字钢与混凝土之间的粘结破坏，显著影响型钢混凝土（SRC）结构的耐久性。本研究通过加速锈蚀试验和推出试验，研究考虑工字钢锈蚀时的粘结滑移性能和特性，试验结果表明：（1）锈蚀率达到12%时，粘结滑移性能退化加速。（2）SRC的锈蚀破坏模式在上升阶段经历滑移阶段和破坏阶段。（3）基于最小势能原理，仅通过自由端和加载端的荷载和位移即可得到粘结应力。（4）同时，利用界面损伤理论建立了新的粘结滑移退化模型。最后，所提出的模型与试验结果吻合良好。
