Shear Strength Model for Steel Fiber-Reinforced Concrete Columns

This paper aims to propose shear strength prediction equations for steel fiber-reinforced concrete (SFRC) columns by observing mechanisms known from the test results of SFRC columns subjected to lateral cyclic and different axial loading levels. The experimental results are first compared to the shear strength models previously proposed. The comparison is emphasized on the concrete contribution because the experimental results showed that the axial loading level significantly affected the internal redistribution from concrete to shear reinforcing bars. The proposed equations are examined using experimental results of 25 SFRC columns. The average measured-to-proposed shear strength ratio is 1.02, with a standard deviation of 0.18 and a coefficient of variation (COV) of 17%. By setting the equivalent bond strength value for all cases, the accuracy drops by 11 and 17% for standard deviation and COV, respectively, with an average measured-to-proposed shear strength ratio of 1.00. The proposed equations predict the actual test data with higher accuracy compared to other equations.

Automated summary

This study proposes shear strength prediction equations for steel fiber-reinforced concrete (SFRC) columns based on observations from test results. The proposed equations demonstrate higher accuracy in predicting shear strength compared to other equations.