Experimental study on ultimate strength of normal sections in reinforced concrete beams
Abstract
This paper presents an experimental programme conducted on a number of six reinforced concrete (RC) beams in order to investigate the developments of strain and stress, moment-curvature relationship, failure mode and the ultimate strength on normal sections (USoNS) of this type of basic structural element. The beam specimens were 120mm × 200mm in cross section and 2.2m in length. They were divided into three series with the longitudinal reinforcement ratio varied from 0.42, 0.65 and 0.94%. There were two identical beams in each series. The experimental data were incorporated to validate the results calculated based on various design codes for RC structures including ACI 318- 11, EN 1992-1-1:2004, TCVN 5574:2012 and SP 63.13330.2012. The up-to-date Russian code SP 63.13330.2012, which is currently used as a basis for drafting the new Vietnamese code to replace TCVN 5574:2012, also adopts the plane strain assumption and the simplified stress-strain relationships of materials in the calculation based on non-linear deformation model similar to ACI and EC2. It is shown that such assumption and design procedure for USoNS specified in SP 63.13330.2012 can be applied with reliability for specimens made and tested in Vietnam condition.
Keywords: Strength, bending moment, normal section, beam, reinforced concrete.
Received: October 1st, 2017; revised: October 16th, 2017; accepted: November 2nd, 2017
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