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http://dx.doi.org/10.9712/KASS.2015.15.2.069

Shear Transfer Strength Evaluation for Ultra-High Performance Fiber Reinforced Concrete  

Lee, Ji-Hyung (Department of Architecture and Architectural Engineering, Seoul National University)
Hong, Sung-Gul (Department of Architecture and Architectural Engineering, Seoul National University)
Publication Information
Journal of Korean Association for Spatial Structures / v.15, no.2, 2015 , pp. 69-77 More about this Journal
Abstract
Ultra High Performance Fiber Reinforced Concrete (UHPFRC) has a outstanding tensile hardening behaviour after a crack develops, which gives ductility to structures. Existing shear strength model for fiber reinforced concrete is entirely based on crack opening behavior(mode I) which comes from flexural-shear failure, not considering shear-slip behavior(mode II). To find out the mode I and mode II behavior on a crack in UHPFRC simultaneously, maximum shear strength of cracked UHPFRC is investigated from twenty-four push-off test results. The shear stress on a crack is derived as variable of initial crack width and fiber volume ratio. Test results show that shear slippage is proportional to crack opening, which leads to relationship between shear transfer strength and crack width. Based on the test results a hypothesis is proposed for the physical mechanics of shear transfer in UHPFRC by tensile hardening behavior in stead of aggregate interlocking in reinforced concrete. Shear transfer strength based on tensile hardening behavior in UHPFRC is suggested and this suggestion was verified by comparing direct tensile test results and push-off test results.
Keywords
Crack width; Cracked concrete; Shear transfer strength; Push-off test; Tensile hardening behavior; UHPFRC;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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