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Title |
A Study on the Experiment of Flexural Behavior of Composite Beam with Steel Fiber Reinforced UHPC and Inverted-T Steel Considering Compressive Strength Level
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Authors |
유성원(Sung-Won Yoo) ; 서정인(Jeong-In Suh) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2015.27.6.677 |
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Keywords |
UHPC ; 역T형 강재 거더 ; 합성보 휨거동 ; 강섬유 UHPC ; inverted-T shaped steel girder ; flexural behavior of composite beam ; steel fiber |
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Abstract |
In a will to subdue the brittleness as well as the low tensile and flexural strengths of ordinary concrete, researches are being actively watched worldwide on steel fiber-reinforced Ultra High Performance Concrete (UHPC) obtained by admixing steel fibers in ultra high strength concrete. For the purpose of maximizing advantage of UHPC, this study removes the upper flange of the steel girder to apply an inverted T-shape girder for the formation of the composite beam. This paper intends to evaluate the behavior of the shear connectors and the flexural characteristics of the composite beam made of the inverted T-shape girder and UHPC slab using 16 specimens considering the compressive strength of concrete, the mixing ratio of steel fiber, the spacing of shear connectors and the thickness of the slab as variables. In view of the test results, it seemed that the appropriate stud spacing should range between 100 mm and 2 or 4 times the thickness of the slab. Moreover, the relative displacement observed in the specimens showed that ductile behavior was secured to a certain extent with reference to the criteria for ductile behavior suggested in Eurocode-4. The specimens with large stud spacing exhibited larger values than given by the design formula and revealed that the shear connectors developed larger ultimate strength than predicted owing to the action of UHPC and steel after non-composite behavior. Besides, the specimens with narrow stud spacing failed suddenly through compression at the upper chord of UHPC before reaching the full capacity of the shear connectors.
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