Residual flexural strengths of steel fiber reinforced concrete with multiple hooked-end fibers

作者：Venkateshwaran, Akshay; Tan, Kiang Hwee^*; Li, Yi

来源：Structural Concrete, 2018, 19(2): 352-365.

DOI：10.1002/suco.201700030

• hooked-end fibers
• limit of proportionality
• reinforcing index
• residual flexural strengths
• steel fiber reinforced concrete

This paper presents the results of 3-point bending tests on 69 prenotched steel fiber reinforced concrete (SFRC) prisms conducted in accordance with EN 14651 to obtain the stress versus crack-mouth-opening displacement curves. SFRC prisms with fiber content greater than 20kg/m(3) and containing multiple hooked-end fibers were found to exhibit deflection hardening behavior in bending after first crack. Based on the test results, empirical models to determine the residual flexural stresses are established through multiple regression analysis and further validated with test results available in the literature. The residual flexural strengths were found to be proportional to the reinforcing index, the square root of concrete compressive strength, and the square of the number of hooks at the fiber ends. Size effect is accounted for by introducing a factor which is a function of the fiber length. The empirical equations for the residual flexural strengths enable the use of Model Code 2010 constitutive relation for SFRC in tension without resorting to prism tests.

• 出版日期2018-4
• 单位东北大学