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http://dx.doi.org/10.5762/KAIS.2020.21.12.772

Calculation of Horizontal Shear Strength in Reinforced Concrete Composite Beams  

Kim, Min-Joong (Department of Smart Civil & Environment Engineering, Suncheon Jeil College)
Lee, Gi-Yeol (Department of Landscape Architecture, Chonnam National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.12, 2020 , pp. 772-781 More about this Journal
Abstract
A direct shear member resists external forces through the shear transfer of reinforcing bars placed at the concrete interface. The current concrete structural design code uses empirical formulas based on the shear friction analogy, which is applied to the horizontal shear of concrete composite beams. However, in the case of a member with a large amount of reinforcing bars, the shear strength obtained through the empirical formula is lower than the measured value. In this paper, the limit state of newly constructed composite beams on an existing concrete girder is defined using stress field theory, and material constitutive laws are applied to gain horizontal shear strength while considering the tension-stiffening and softening effects of concrete struts. A simplified method of calculating the shear strength is proposed, which was validated by comparing it with the related design code provisions. As a result, it was confirmed that the method generally shows a similar tendency to the experimental results when the shear reinforcing bar yields, unlike the regulations of the design code, where differences in the predicted value of shear strength occur according to the shear reinforcement ratio.
Keywords
Horizontal Shear; Shear-Friction; Shear-Transfer; Composite Beams; Biaxial Stress Field;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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