Comparative study on flexural performance of ultra‐high performance concrete beams reinforced with steel rebar and steel plate

Author:

Yan Banfu1,Chen Qiuyan1,Qiu Minghong2ORCID,Zhu Yanping3,Tu Bing1,Shao Xudong45

Affiliation:

1. School of Civil Engineering and Architecture Guangxi University Nanning China

2. Department of Civil Engineering University of Hong Kong Hong Kong China

3. Civil, Architectural and Environmental Engineering Missouri University of Science and Technology Rolla Missouri USA

4. Key Laboratory for Wind and Bridge Engineering of Hunan Province Hunan University Changsha China

5. National Key Laboratory of Bridge Safety and Resilience Hunan University Changsha China

Abstract

AbstractTo enhance the mechanical and constructional performance of the ultra‐high performance concrete (UHPC) beams, the steel plate placed at the bottom surface of the UHPC beam is utilized to replace the ordinary steel rebars. In this paper, four 3.2 m UHPC T‐shaped beams with different reinforcement patterns of ordinary steel rebars and external steel plate were fabricated and comparatively tested under flexure loading. Their damage patterns, load versus deflection behavior, flexural capacity, load versus strain behavior, moment versus curvature behavior, stiffness, and crack development were investigated. The flexural experiments indicated that the external steel plate, positioned at the bottom surface of the UHPC members, could resolve the difficulty of installing ordinary steel rebars in slender UHPC components and improve its constructional performance. Compared with the inside steel rebar reinforcement, the employment of the steel plate at the bottom surface of the UHPC beam can effectively increase the distance from the neutral axis to the tensile reinforcement at the serviceability and ultimate states, thereby improving its flexural capacity and stiffness. Additionally, the configuration of the external steel plate was beneficial to reduce the tensile stress level of the tensile reinforcement and limit the opening of UHPC crack width, and thus their crack resistance can be effectively enhanced. Moreover, increasing the thickness of the steel plate or rebar ratio can also significantly improve the flexural capacity, stiffness, and cracking resistance of UHPC beams.

Funder

National Natural Science Foundation of China

Science and Technology Program of Hunan Province

Publisher

Wiley

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