Abstract
Conducting research on steel fiber-reinforced concrete (SFRC) beams without stirrups, particularly the SFRC beams with high-strength concrete (HSC) and high-strength steel (HSS) reinforcing bars is essential due to the limitation of test results of high strength SFRC beams with high strength steel reinforcing bars. Eight shear strength prediction equations for analysis and design of the SFRC beam derived by different researchers are summarized. A database was constructed from 236 beams. Accordingly, the previous shear strength equations can be evaluated. Ten high-strength SFRC beams subjected to monotonic loading were prepared to verify the existing shear strength prediction equations. The equations for predicting shear strength of the SFRC beam are proposed on the basis of observations from the test results and evaluation results of the previous shear strength equations. The proposed shear strength equation possesses a reasonable result. For alternative analysis and design of the SFRC beams, ACI 318-19 shear strength equation is modified to consider steel fiber parameters.
Highlights
Using high-strength concrete (HSC) with compressive strength exceeding 70 multiplication between 0.29 fc0 (MPa) and high-strength steel (HSS) with yield stress of 685 MPa or greater can reduce the member section size and the volume of concrete and steel bars for the entire building structure [1]
The evaluation results show that the proposed shear strength prediction equation can be applied to predict the shear strength of RC or steel fiber-reinforced concrete (SFRC) beams with a concrete compressive strength, fiber volume fraction, yield strength of longitudinal reinforcing bar, and shear-span-to-effective depth ratio ranging from 20 MPa to 194 MPa, 0% to 1.5%, 420 MPa to 785 MPa, and 2.5 to 6.0
This study presents the results of comparison between the shear strengths of RC and SFRC
Summary
Using high-strength concrete (HSC) with compressive strength exceeding 70 MPa and high-strength steel (HSS) with yield stress of 685 MPa or greater can reduce the member section size and the volume of concrete and steel bars for the entire building structure [1]. Short and discontinuous steel fiber can be used as an alternative material to improve the ductile behavior of concrete [2,6,7,8,9]. Previous research studies have shown that adding steel fibers to concrete beams could enhance shear resistance, toughness, promote flexural failure and ductility, and potentially act as a substitute for conventional shear reinforcement [10,11,12,13,14,15,16,17]. Despite the advantages of steel fibers as reinforcement in the concrete beams, the number of research studies on high-strength steel fiber-reinforced concrete (SFRC) beam with HSS longitudinal bar is limited. The new equation for predicting shear strength is proposed based on the evaluation of shear strength equations studied in this paper
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