Abstract
Beam-column joints require a high ductility during the unexpected loadings that necessitate the need for ductile concrete in such unprotected locations. Alternatively, self-compacting concrete (SCC) is a sort of concrete which has generated tremendous interest throughout the last decades in order to reach a ductile structural elements during the seismic actions. Specific properties of this type of concrete include high performance, high resistance against segregation and needless to internal or external vibration in order to compact. In the seismic regions, ductility is one of the most important factors in the design of reinforced concrete (RC) members, especially structural joints flexural performance; it is due to the enhance in the capability of plastic deformability. This paper describes load-displacement behavior of experimental and theoretical analysis of four SCC beam-column joints with different percentage of the ratio of the reinforcing bars (ρ). In the theoretical phase of this investigation three-dimensional nonlinear finite element method (FEM) model i.e., Seismostruct was used and the load-deflection diagrams were plotted to compare the test results with the numerical output. The experimental results and nonlinear FEM modeling indicate that using SCC as a workable concrete in beam-column joints of reinforced concrete structures has satisfactory performance in terms of ductility and energy dissipations.
Highlights
Self-compacting concrete (SCC) has found a great application in reinforced concrete (RC) members during the last decades
The significance of this research lies to obtain a better understanding of the load-deformation performance of reinforced self-compacting concrete beam-column joints loaded to failure in terms of ductility and energy dissipation during the seismic actions
The current study presents both experimental and finite element analysis results of four nearly full-scale SCC beams-column joints utilizing simple beams loaded at mid-span through a stub to simulate a beam-column joint
Summary
Self-compacting concrete (SCC) has found a great application in reinforced concrete (RC) members during the last decades. When a self-compacting reinforced concrete structure is subjected to an earthquake or to loading, its ability to deform inelastically is of importance together with its ability to carry the load. The results of the above-mentioned studies showed the importance of investigation of flexural behavior of reinforced SCC both experimentally and theoretically. The significance of this research lies to obtain a better understanding of the load-deformation performance of reinforced self-compacting concrete beam-column joints loaded to failure in terms of ductility and energy dissipation during the seismic actions. This work has enhanced our knowledge around the factors contributing to the ductility of beam-column connections amount of reinforcing ratio on tension and in compression in reinforced self-compacting concrete structures; that is, their ability to deform in the inelastic range beyond yielding, commonly referred to as “plastic hinging”. In the analytical section of the study, an inelastic behavior of the specimens was determined by employing the realistic material models using Seismostruct (2013) as a three-dimensional finite element method (FEM) modeling nonlinear software
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