Title: Shear-Friction Strength of Reinforced Concrete Walls with 700 MPa Reinforcing Bars

Author(s): Sung-Hyun Kim and Hong-Gun Park

Publication: Structural Journal

Volume: 120

Issue: 1

Appears on pages(s): 303-316

Keywords: cyclic loading; Grade 700 MPa (101.5 ksi) bar; shear-friction strength; shear wall.

DOI: 10.14359/51737238

Date: 1/1/2023

Abstract:
Recently, the use of 700 MPa (101.5 ksi) reinforcing bars was permitted for the shear design of special walls in the current design code. In the present study, to investigate the effect of 700 MPa (101.5 ksi) reinforcement on the shear-friction strength of reinforced concrete (RC) walls, five wall specimens were tested under cyclic lateral loading. For the test parameters, interface roughness, the vertical reinforcement ratio at boundary elements, and the use of flanged walls (two flanges or single flange) were considered. The test results showed that the shear-friction strength of walls with 700 MPa (101.5 ksi) reinforcing bars was greater than the ACI 318-19 shear-friction strength. Particularly, in the wall with a low vertical reinforcement ratio (0.27%), the peak strength was greater than the shear-friction strength corresponding to the actual high yield strength (700 MPa [101.5 ksi]) of vertical reinforcing bars. Further, the vertical reinforcing bars in the flanged wall significantly increased the shear-friction strength. The current ACI 318-19 design method and an improved model were evaluated based on the existing test results, including the present study.