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Title |
Experimental Investigation of the Web-Shear and Flexural-Shear Strengths of PC Hollow Core Slabs by Extrusion Forming
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Authors |
오영훈(Young-Hun Oh) ; 신익수(Ik-Su Shin) ; 강승일(Sung-Il Kang) ; 문정호(Jeong-Ho Moon) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.4.463 |
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Keywords |
중공슬래브; 복부전단; 휨전단; 전단보강; 설계식 hollow core slab; web-shear; flexural-shear; shear reinforcement; design equation |
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Abstract |
This study presents an experimental investigation into the shear strength of hollow core slabs (HCS) produced by extrusion forming. A total of 21 slab specimens were tested to evaluate both web-shear and flexural-shear strengths. The specimens included PC-HCS with heights of 200 mm, 320 mm, 350 mm, 400 mm, and 500 mm. For each height, specimens were classified into four test methods (TM-1, TM-3, TM-4, TM-5), based on variables such as topping concrete, presence of shear reinforcement, and failure modes. The experimental results were analyzed using strength ratios relative to the design strengths in the KDS. The findings revealed that web-shear specimens without shear reinforcement (TM-1, TM-3) exhibited strength ratios greater than 1.0, while specimens with shear reinforcement (TM-4) showed strength ratios below 1.0. Flexural-shear specimens (TM-5) displayed a high strength ratio distribution and exhibited failure modes approaching flexural failure. Based on these findings, it was concluded that the contribution of shear reinforcement to overall shear strength should be evaluated lower than the design standards. Additionally, the flexural-shear strength evaluation method yielded conservative estimates. Since web-shear failure will typically be evaluated near the support points, it is important to fabricate the slabs in a way that prevents excessive tendon slip.
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