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Title |
Material Properties and Structural Characteristics on Flexure of Steel Fiber-Reinforced Ultra-High-Performance Concrete
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Authors |
김경철(Kyoung-Chul Kim) ; 양인환(In-Hwan Yang) ; 조창빈(Chang-Bin Joh) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2016.28.2.177 |
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Keywords |
강섬유 ; 초고성능 콘크리트 ; 휨성능 ; 연성지수 ; 곡률 steel fibers ; ultra-high performance concrete ; flexural capacity ; ductility index ; crack |
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Abstract |
This paper concerns the flexural behavior of steel fiber-reinforced ultra-high-performance concrete (UHPC) beams with compressive strength of 150 MPa. It presents experimental research results of hybrid steel fiber-reinforced UHPC beams with steel fiber content of 1.5% by volume and steel reinforcement ratio of less than 0.02. This study aims at investigating of compressive and tensile behavior of UHPC to perform a reasonable prediction for flexural capacity of UHPC beams. Tensile behavior modeling was performed using load-crack mouth opening displacement relationship obtained from bending test. The experimental results show that steel fiber-reinforced UHPC is in favor of cracking resistance and ductility of beams. The ductility indices range from 1.6 to 3.0, which means high ductility of hybrid steel fiber-reinforced UHPC. Test results and numerical analysis results for the moment-curvature relationship are compared. Though the numerical analysis results for the bending capacity of the UHPC beam without rebar is larger than test result, the overall comparative results show that the bending capacity of steel fiber-reinforced UHPC beams with compressive strength of 150 MPa can be predicted by using the established method in this paper.
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