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Title |
Prediction of Bending Strength of Concrete Beams with Compressive Strength of 80 MPa
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Authors |
김경철(Kyoung-Chul Kim) ; 양인환(In-Hwan Yang) ; 조창빈(Chang-Bin Joh) |
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DOI |
https://doi.org/10.4334/JKCI.2017.29.4.335 |
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Keywords |
high-strength concrete ; high-strength rebar ; bending strength ; ductility |
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Abstract |
This paper aims at investigating the bending strength of high-strength concrete beams with compressive strength of 80MPa. The experimental parameters included nominal yielding strength of rebar with 400 and 600 MPa, rebar ratio ranging from 0.98 to 1.97%, and shear span-effective depth ratios (a/d) of 6.0 and 4.8. Experimental results were discussed regarding load-deflection relationship, ductility, bending strength, and prediction of bending strength of beams. Test results indicate that the use of high-strength rebar increased bending strength but decreased ductility. As span-effective depth ratio increased, the ductility of test beams decreased. In addition, test results of bending strength were compared with predictions from the current KCI code, Eurocode 2 and Korean Highway Design Specification (KHDC). The design code predictions for bending strength underestimated the experimental results. Therefore, the current design code predictions for bending strength of high-strength concrete beams would provide conservative design. Predictions of bending strength from KCI code using strength reduction factors and those from Eurocode 2 as well as KHDC using material factors were similar each other.
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