Shear and Shear-Friction Strengths of Squat Walls with Flanges

摘要

Nine squat shear walls were tested under cyclic loading to investigate the effect of flanges on the seismic resistance of the walls. Test parameters were failure mode, flange thickness, reinforcement ratio, aspect ratio, and grade of the reinforcing bars. The test results showed that, for squat walls, vertical reinforcing bars in the flanges or boundary elements significantly increased the shear strength of the wall, while the shear contribution of the flange concrete was marginal. On the other hand, due to the strut-and-tie mechanism of squat walls, horizontal reinforcing bars in the web did not effectively contribute to the shear strength of the walls and remained elastic at peak strength. The shear-friction strength was also significantly increased by virtue of the vertical reinforcing bars in flanges. The test results provided evidence that the vertical reinforcement in flanges effectively contributed to shear and shear-friction strength and should be considered in the strength prediction.