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Title |
An Experimental Study on Structural Behavior of High-strength Concrete Members with Compressive Strength of 80 MPa Subjected to Flexure
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Authors |
양인환(In-Hwan Yang) ; 황철성(Chul-Sung Hwang) ; 김경철(Kyoung-Chul Kim) ; 조창빈(Chang-Bin Joh) |
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DOI |
https://doi.org/10.11112/jksmi.2017.21.4.001 |
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Keywords |
고강도 콘크리트 ; 고강도철근 ; 휨강도 ; 파괴형상 ; 연성지수 High-strength concrete ; High-strength rebar ; Flexural strength ; Crack pattern ; Ductility index |
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Abstract |
This paper concerns the structural behavior of high-strength concrete beams with compressive strength of 80 MPa subjected to flexure. Main test variables were nominal yielding strength of longitudinal rebar including normal strength rebar(SD 400) and high strength rebar(SD 600), reinforcement ratio from 0.98 to 1.58% and beam section size with 200×250, 200×300 mm. The nine beams were cast and tested under flexure. The study investigated ultimate flexural strength, load-deflection relationship, crack patterns, failure patterns and ductility of the test beams. Test results indicate that when rebar ratio increased flexural strength increased and ductility decreased. In addition, the number of cracks increased and the crack width decreased as the reinforcement ratio increased. The yield strength of rebar did not affect significantly load-crack width relationship. Nonlinear analysis of test beams was performed and then test results and analytical results of ultimate load were compared. Analytical results of high-strength concrete beams overall underestimated flexural strength of test beams.
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