Abstract
Three reinforced concrete beams, one with no shear reinforcement and two others with shear reinforcement ratios of 0.4% and 1.1%, were tested to investigate the influence of stirrup spacing on the mode of failure, overall strength and ductility. The results show that the beam reinforced with closely-spaced shear reinforcement failed in a ductile manner, whereas the other two beams with large stirrup spacing and no stirrup exhibited only a small measure of ductility and failed in a brittle manner. The importance of the provisions of maximum spacing is highlighted to ensure adequate anchorage for the stirrups and prevent a premature shear failure to occur. The application of a non-contact monitoring system employing the open source digital image correlation software Ncorr, an ordinary digital camera and a smartphone is demonstrated to provide a visualization of the cracking process throughout the load history.
Highlights
Reinforced concrete members are generally designed to exhibit ductile flexural failure
When designing a reinforced concrete beam, practising engineers would generally have to follow the requirements set out by national design specification, which in Indonesia is SNI2847:2013 [6], drafted largely based on ACI 318M-11 [7]. This generally involves the calculation of the shear capacity provided by the concrete, Vc, and the contribution provided by the shear reinforcement, Vs, as per SNI 2847:2013 clauses 11.2.2.1 and 11.4.7 [6]
Failure was characterised by a sudden drop in load, indicating a brittle failure with no further ductility and residual strength apparent beyond the peak load
Summary
Reinforced concrete members are generally designed to exhibit ductile flexural failure. Three reinforced concrete beams were tested under two-point loading.
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