Ma Yafei, Lu Baoyong, Guo Zhongzhao, Wang Lei, Chen Hailong, Zhang Jianren
School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China.
Key Laboratory of Bridge Engineering Safety Control by Department of Education, Changsha 410114, China.
Materials (Basel). 2019 Mar 27;12(7):1014. doi: 10.3390/ma12071014.
Shear strength is a widely investigated parameter for reinforced concrete structures. The corrosion of reinforcement results in shear strength reduction. Corrosion has become one of the main deterioration factors in reinforced concrete beam. This paper proposes a shear strength model for beams with inclined bars based on a limit equilibrium method. The proposed model can be applied to both corroded and uncorroded reinforced concrete beams. Besides the tensile strength of longitudinal steel bars, the shear capacity provided by the concrete on the top of the diagonal crack, the tensile force of the shear steel at the diagonal crack, the degradation of the cross-sectional area and strength of the reinforcements induced by corrosion are all considered. An experimental work on two groups accelerated corroded beams was performed. Good agreements were found between the proposed theoretical predictions and experimental observations.
抗剪强度是钢筋混凝土结构中一个被广泛研究的参数。钢筋锈蚀会导致抗剪强度降低。锈蚀已成为钢筋混凝土梁主要的劣化因素之一。本文基于极限平衡法提出了一种带斜筋梁的抗剪强度模型。该模型可应用于锈蚀和未锈蚀的钢筋混凝土梁。除了纵向钢筋的抗拉强度外，还考虑了斜裂缝顶部混凝土提供的抗剪能力、斜裂缝处抗剪钢筋的拉力、锈蚀引起的钢筋截面积和强度退化。对两组加速锈蚀梁进行了试验研究。理论预测结果与试验观测结果吻合良好。
