Shear Strength Components in Reinforced Concrete Members

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Original languageEnglish
Article number04017092
Journal / PublicationJournal of Structural Engineering (United States)
Issue number9
Online published13 May 2017
Publication statusPublished - Sep 2017


The shear strength () of reinforced concrete (RC) beams consists of two parts: shear resistance of concrete (c ) and contribution of the transverse reinforcement (Vs ). Previous experimental results can only give the total shear strength V of a beam. Until now, no existing experimental means could measure the two aforementioned contributions separately with reasonable accuracy during the test of RC beams. This paper reports an experimental method that is able to quantify the two parts in conventional shear tests of RC beams. This was achieved by measuring the strains along the full length of each stirrup in the shear span without disturbing the bond. Thus, the variation in V c and V s can be recorded during a beam test. Preliminary tests using this method on particular beams show that not all the shear reinforcement intersecting a critical diagonal crack yields at the onset of shear strength. Both V c and V s are not at their maximum values when the shear strength is reached in a beam. The value of V c is not constant under increasing deformation: it first increases and slightly drops after it reaches a peak, followed by a relatively stable plateau until final shear failure. The variation in V c  with respect to member deformation does not match the predictions of existing models.

Research Area(s)

  • Concrete and masonry structures, Reinforced concrete, Shear strength, Shear strength of concrete, Test