Analysis of Flexural Performance of 3D Hooked-End Steel Fiber Reinforced Concrete Based on Three-Point Bending Test of Notched Beam

Abstract

Abstract: Three-point bending tests were carried out on concrete notched beam specimens with seven kinds of 3D hooked-end steel fiber content. The influence of different 3D hooked-end steel fiber content on the flexural performance of concrete notched beam specimens was studied with digital image correlation (DIC) technology. According to the test result, it shows that concrete notched beam specimens with 3D hooked-end steel fiber have excellent bending toughness. The load-crack mouth opening displacement (CMOD) curve of concrete notched beam specimens with 3D hooked-end steel fiber has two peak values. Except that the ratio of the second peak to the first peak of concrete notched beam specimen with 3D hooked-end steel fiber content of 25 kg/m³ is 0.91, the other concrete notched beam specimens with 3D hooked-end steel fiber are greater than 1. Based on the analysis, the CMOD-deflection relationship and dissipation energy of concrete notched beam specimens with different 3D hooked-end steel fiber content were obtained. According to the analysis results of DIC data, the applicability of the plane section assumption in the bending analysis of concrete notched beam specimens with different 3D hooked-end steel fiber content is verified, and the change rule of neutral axis position during bending is obtained. Based on the pullout process of 3D hooked-end steel fiber, the tensile and bending failure mechanism of 3D hooked-end steel fiber reinforced concrete were analyzed.

Key words: concrete, 3D hooked-end steel fiber, notched beam, flexural performance, load-CMOD curve, dissipation energy, plane section assumption, failure mechanism

CLC Number:

TU528.572

WU Licheng, CHEN Xiangsheng, LEI Jiangsong, ZHENG Aiyuan, WANG Xuetao, DENG Yisan. Analysis of Flexural Performance of 3D Hooked-End Steel Fiber Reinforced Concrete Based on Three-Point Bending Test of Notched Beam[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(5): 1661-1671.

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