Experimental and analytical studies on shear behaviors of FRP-concrete composite sections. (15th July 2020)

• Record Type: Journal Article
• Authors: Zou, Xingxing; Feng, Peng; Bao, Yi; Wang, Jingquan; Xin, Haohui
• Is Part Of: Engineering structures. Volume 215(2020)
• Publication Date: 2020-07-15
• Subjects: Shear capacity -- FRP-concrete composite sections -- Composite action -- Slip effect -- Shear connection; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2020.110649
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Flexural tests of FRP-concrete composite beams were conducted in this paper. Closed-form equations of shear capacity of FRP-concrete composite section were derived, which agreed well with the test results. Simple yet reliable equations to design the FRP-concrete composite sections were proposed. Abstract: The design of FRP profile-concrete composite sections, including beams and decks, is usually governed by the shear strength of the FRP profiles. However, analytical methods that can precisely predict the shear capacity of the composite sections have not been well developed, because there is lack of knowledge of the FRP-concrete composite action and distribution of shear stress along the FRP. This paper investigates the shear behaviors of FRP-concrete composite sections and develops formulae to predict the shear capacity of the composite sections. First, flexural tests of three FRP-concrete composite beams were conducted to investigate the shear failure mode and interface behaviors. All the beams failed in FRP shear fracture along horizontal direction. Then, push-out tests were used to determine the slip property for the FRP-concrete interface which reveals that FRP stay-in-place form and steel bolts can ensure full and partial composite action, respectively. Based on the experimental study, closed-form equations to compute the maximum shear stress are derived and validated against experimental data in this paper and literature. Finally, simple yet reliable equations of shear capacity are derived and recommended for engineers to design the FRP-concrete composite sections.