2019 Volume 17 Issue 6 Pages 309-318
When buildings are seismically retrofitted, new members are connected to existing members through a roughened concrete surface, which is created using a vibration drill. However, there are few studies on such roughened concrete. When the roughened concrete area ratio is small, bearing failure occurs. On the other hand, shear failure occurs when the roughened concrete area ratio is large. In this paper, the focus was on bearing failure. When the roughened concrete area ratios were 0.1 to 0.3, the failure mode was bearing failure. To evaluate shear strength, the shapes of roughened concrete were measured using a laser displacement sensor and 3D scanner. Moreover, shear loading tests were conducted. Finally, a shear strength formula was proposed considering the concrete compressive strength, Young’s modulus, and vertical projection area. By comparing the test results with the calculated values, it is concluded that the proposed formula estimated the test results well. Finally, this paper is an extension of the authors’ previous work [Musya et al., (2019). “Supported Strength Formula of Roughened Concrete Using Shape Measurement Value by 3D-scanner.” AIJ Journal of Technology and Design, 25(59), 55-60].
