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Title |
Horizontal Shear Strength in Precast Concrete Composite Beams with Shear Keys
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Authors |
박성준(Seong-Joon Park) ; 손동희(Dong-Hee Son) ; 배백일(Baek-Il Bae) ; 정다운(Daun Jeong) ; 최창식(Chang-Sik Choi) |
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DOI |
https://doi.org/10.4334/JKCI.2023.35.6.625 |
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Keywords |
프리캐스트 콘크리트 합성보; 전단키; 수평전단강도 precast concrete composite beam; shear key; horizontal shear strength |
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Abstract |
While precast concrete construction methods are widely utilized across various construction sites, current concrete structural standards lack an effective calculation method that optimally incorporates concrete variables for horizontal shear strength. Previous studies have presented diverse opinions regarding the utilization of shear keys. Even though there is a design formula for horizontal shear strength employing shear keys in international practices, a detailed calculation method specific to shear key characteristics is absent. Therefore, this study evaluated the horizontal shear strength and shear strength of precast concrete composite beams, focusing on the detailed features of shear keys formed at joint interfaces. Four-point loading tests were conducted on five specimens, considering variables such as clamping stress and shear key height at the interface. Analysis of experimental results revealed that shear keys had limited influence on shear strength but demonstrated variations in their contribution to horizontal shear strength depending on their height. The shear key design equation proposed in previous studies was deemed to be inappropriate, highlighting the importance of considering height in the design of composite beams using shear keys.
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