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    Seismic performance of full-scale RC columns containing high proportion recycled aggregate
    (Springer, 2019) Saribas, Ilyas; Goksu, Caglar; Binbir, Ergun; Ilki, Alper
    The potential for utilizing high proportion recycled aggregates sourced from low strength waste concrete in new concrete construction is investigated in this paper. A comprehensive experimental program, consisting of ten full-scale, flexure critical reinforced concrete columns, five of which were constructed of natural concrete aggregate and five of which contained approximately 50% recycled concrete aggregate replacing the mid-sized coarse natural aggregate, was conducted to determine the effects of different axial loads and different spacings of transverse reinforcement on the seismic characteristics of columns incorporating recycled concrete aggregates. Seismic characteristics were quantified by analysis of hysteretic response, energy dissipation capacities, damage progression, residual displacement, and strain distribution of the longitudinal reinforcement. The test results indicate that the reinforced concrete columns constructed of natural aggregate concrete and those constructed of recycled aggregate concrete exhibit similar seismic performance, despite the fact that the compressive strength of the recycled aggregate concrete was slightly lower than that of the natural aggregate concrete. A theoretical study was then conducted to predict the load-displacement response of the columns. The comparison of the experimental data with the results of these theoretical calculations indicated that conventional RC design theory applied to columns incorporating natural aggregate is also valid for columns incorporating recycled aggregate. Finally, the confinement effect of the transverse reinforcement in columns subjected to low axial load were also critically evaluated for columns built with recycled aggregate concrete.
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    Öğe
    Seismic performance of full-scale RC columns containing high proportion recycled aggregate (vol 17, pg 6009, 2019)
    (Springer, 2019) Saribas, Ilyas; Goksu, Caglar; Binbir, Ergun; Ilki, Alper
    [Abstract Not Available]
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    Shear-flexure interaction in RAC columns under simulated seismic actions
    (Elsevier Ltd, 2021) Saribas, Ilyas; Goksu, Caglar; Binbir, Ergun; Ilki, Alper
    Inelastic flexural deformations adversely affect shear resistance of columns, and may cause building damage/collapse during earthquakes. In this paper, shear-flexure interaction on seismic performance of reinforced concrete columns constructed with recycled aggregate concrete is experimentally investigated. For this aim, reinforced concrete columns with low shear-span-to-depth ratio (2.3) were designed and constructed so that they reach their flexural lateral load capacities in accordance with capacity design principles, and the effect of shear deformations can be observed only after yielding of longitudinal reinforcing bars due to cyclic degradation. The shear-flexure interaction is characterized based on the amount of transverse reinforcement, and formulated within the framework of conventional reinforced concrete design theory during the design of the columns. These columns are then tested under the combined effects of axial and reversed cyclic lateral loads to simulate seismic loading. The recycled concrete aggregate is sourced from waste of low strength concrete, and replaced with 50% of natural coarse aggregate for the concrete mix. Comparison with columns constructed of natural aggregate is also presented in the study. The test results showed that the reinforced concrete columns either made of natural aggregate concrete or recycled aggregate concrete exhibited similar seismic performances for different interactions of shear and flexure. As the ratio of transverse reinforcement is reduced the deformation capability was reduced due to more pronounced effect of shear deformations. In addition, the load–displacement relationships determined through theoretical analysis were found to be compatible with the experimental data. Furthermore, a discussion on the minimum transverse reinforcement provisions of EN 1998-1, ACI 318-19 and TBEC-18 is also presented in order to investigate whether it is possible to reduce the required ratio of minimum transverse reinforcement per technical documents for the columns located in low to moderate seismicity regions. © 2021 Elsevier Ltd