New-and-Old Concrete Interface Shearing Strength Test and Shear Slip Behavior Analysis

To explore the influence of different factors on the shear resistance of the fiber-reinforced Engineered Cementitious Composite (ECC) and ordinary concrete interface, the influence rule of rib width, rib height, and planting bars ratio on the interface shear strength of steel fiber-reinforced ECC and ordinary concrete was investigated by orthogonal experimental design. The experimental results show the rib width is the most important factor affecting the shear strength of the interface, and the ratio of planting bars minimally influences the shear strength of the interface. The order of main influence factors of shear resistance of interface can be arranged as follows: rib width→rib height→planting bars ratio. Experimental process and load-displacement curve show the failure of the double-sided shear specimen with ribs or planting bars has certain plastic failure characteristics, which extends the failure time of the specimens.