Abstract
Deep T-section beams have been widely used in engineering structures due to their high bearing capacity, high construction efficiency and economic benefits, while the current beam design theory can hardly interpret reasonably the mechanical behaviors of deep beams. The performance features of the deep T-beam were investigated, involving in strain distribution and principal stress trace using experimental tests. Different near surface mounted (NSM) reinforcement schemes were proposed for deep T-beams aiming at improving the shear capacity. The results show that the behaviors of deep T-beams dissatisfy the assumption of plane cross-section, and the ‘strut-and-tie’ model is applicable in such structures. The reinforcement systems can significantly relieve the strain concentration, mid-span deflection and crack width in deep T-beams, consequently improving the shear capacity range from 45 to 65%. The scheme is preferential for the reinforcement of deep T-beams when the applied angles, positions and lengths of CFRP bars are optimized based on the ‘strut-and-tie’ model.
Highlights
Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China; Abstract: Deep T-section beams have been widely used in engineering structures due to their high bearing capacity, high construction efficiency and economic benefits, while the current beam design theory can hardly interpret reasonably the mechanical behaviors of deep beams
The reinforced deep T-beams based on Schemes I and II were tested under three-point bending condition to analyze the reinforcement efficiency of the schemes
The normal stress of the Carbon Fiber Reinforced Polymer (CFRP) bars distributes unevenly along the length direction, keeping the stress peaks at the central part of the bars and gradually decreasing toward both ends, regardless of the reinforcement schemes. This implies that the external load exerting on the beam is physically transferred to the central part of the CFRP bars, while the other part of the bars exerts a smaller action in bearing capacity
Summary
CFRP bars were manufactured and selected, followed by an investigation of the interface between the CFRP bars and the reinforced concrete (RC) T-beam substrate. The interfacial properties were studied experimentally, including the bond-slip law, interface strain distribution and load-transfer law in the reinforced system
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