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http://dx.doi.org/10.4334/JKCI.2017.29.4.335

Prediction of Bending Strength of Concrete Beams with Compressive Strength of 80 MPa  

Kim, Kyoung-Chul (Dept. of Civil Engineering, Kunsan National University)
Yang, In-Hwan (Dept. of Civil Engineering, Kunsan National University)
Joh, Chang-Bin (Structural Engineering Research Division, Korea Institute of Construction Technology)
Publication Information
Journal of the Korea Concrete Institute / v.29, no.4, 2017 , pp. 335-343 More about this Journal
Abstract
This paper aims at investigating the bending strength of high-strength concrete beams with compressive strength of 80 MPa. 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.
Keywords
high-strength concrete; high-strength rebar; bending strength; ductility;
Citations & Related Records
Times Cited By KSCI : 8  (Citation Analysis)
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