To cite this article: Amir, F., Satyarno, I. & Sulistyo, D. (2018). Shear strength behaviour of steel truss embedded in flexural plastic hinge zone of reinforced concrete beam subjected to reversed cyclic loading. J. Phys. Sci., 29(Supp. 2), 133–146, https://doi.org/10.21315/jps2018.29.s2.10
ABSTRACT
Shear strength degradation in plastic hinge region occurring due to the shear strength by concrete mechanism, Vc, decreases with an increase in the curvature ductility under cyclic loading. Before cracking occurs, the contribution of the transverse reinforcement to the shear resistance is insignificant and the whole shear force is resisted by the concrete mechanism. The stress development in the transverse reinforcement is initiated after the occurrence of cracking in the concrete. Thereafter, the failure mechanism will be controlled by the amount of transverse reinforcement (Vc = 0), thus making shear strength provided by the transverse reinforcement, Vs increases. To reduce the requirement of Vs and maintain Vc, a new alternative system was developed for the beam in flexural plastic hinge zone by embedding a steel truss. An experimental study presented herein focused on the shear strength behaviour of steel truss embedded in flexural plastic hinge zone of a reinforced concrete beam subjected to reversed cyclic loading. One beam was constructed and tested in this study, with significant diagonal cracking along the shear span and flexural plastic hinge zone, referred to as the shear-flexure failure, appearing in the tested specimen. Observation from the experiment indicated that the application of steel truss embedded in flexural plastic hinge zone of a reinforced concrete beam has a positive effect to increase the shear strength of the tested beam, compared with that without steel truss. The test result revealed that the shear-flexure failure dominant occured close to support face as well as plastic hinge area. The observation showed that the presence of steel truss in flexural plastic hinge zone can adequately inhibit the change of brittle shear failure, thus making the system promising for seismic resistant structures.
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