A study on the size effect of RC beam–column connections under cyclic loading

Abstract Beam–column connection is one of the vital sub-assemblages of a structural system. This is mainly because their behaviour during earthquake is very critical. Hence, in the present study, an experimental programme was undertaken by considering three types of beam–column connections with some specific deficiencies. For each type, three different sizes of specimens were considered to evaluate the existence of size effect in beam–column connections. Cyclic load was applied using servo hydraulic dynamic actuators with displacement-controlled load of frequency of 0.025 Hz. Amplitudes of the displacement histories were scaled down for two-third and one-third models. It was observed that the size effect became more pronounced with the increase in the brittleness of the specimens. To compare the energy dissipation of specimens having different sizes of beam–column joints, a parameter energy dissipation per unit volume of joint ( e N ) was introduced. This parameter was correlated with different drift angles for different sizes of the specimen and accordingly variation of e N with drift angle for different sizes of specimens were plotted. The variation of stress with relative deflection was also correlated with size of the specimens. It was observed that energy dissipation of specimens per unit volume as well as the variation of stress with relative deflection indicated the existence of size effect.

[1]  C. S. Cai,et al.  New Connection System for Confined Concrete Columns and Beams. I: Experimental Study , 2008 .

[2]  Salim Barbhuiya,et al.  Effects of fly ash and dolomite powder on the properties of self-compacting concrete , 2011 .

[3]  James K. Wight,et al.  Study of Moving Beam Plastic Hinging Zones for Earthquake-Resistant Design of Reinforced Concrete Buildings , 1987 .

[4]  Ç. Belgin,et al.  SIZE EFFECT ON FAILURE OF CONCRETE BEAMS WITH AND WITHOUT STEEL FIBERS , 2002 .

[5]  Moncef L. Nehdi,et al.  Development of corrosion-free concrete beam–column joint with adequate seismic energy dissipation , 2010 .

[6]  B.I.G. Barr,et al.  SIZE EFFECT IN AXIALLY LOADED REINFORCED CONCRETE COLUMNS , 2004 .

[7]  Z. Bažant,et al.  Fracture and Size Effect in Concrete and Other Quasibrittle Materials , 1997 .

[8]  L. Feo,et al.  Seismic improvement of RC beam–column joints using hexagonal CFRP bars combined with CFRP sheets , 2013 .

[9]  Valeria Corinaldesi,et al.  Behaviour of beam–column joints made of recycled-aggregate concrete under cyclic loading , 2011 .

[10]  Ç. Belgin,et al.  Size effect on failure of overreinforced concrete beams , 2008 .

[11]  Joaquín G. Ruiz-Pinilla,et al.  Experimental tests on retrofitted RC beam-column joints underdesigned to seismic loads. General approach , 2014 .

[12]  Mohamed Maalej,et al.  Application of Engineered Cementitious Composites (ECC) in interior beam–column connections for enhanced seismic resistance , 2014 .

[13]  M. K. Joshi,et al.  CYCLIC BEHAVIOUR OF PRECAST RC CONNECTIONS , 2005 .

[14]  G. Moriconi,et al.  The influence of recycled concrete aggregates on the behavior of beam–column joints under cyclic loading , 2014 .

[15]  Varol Koc,et al.  Size Effect in Normal- and High-Strength Concrete with Different Notches under the Axial Load , 2009 .

[16]  Emilie Becq-Giraudon,et al.  Size Effect on Failure of Bond Splices of Steel Bars in Concrete Beams , 1999 .

[17]  Riyad S Aboutaha,et al.  Cyclic Response of Exterior Reinforced Concrete Beam-Column Joints Reinforced with Headed Bars-Experimental Investigation , 2003 .

[18]  Kang Hai Tan,et al.  Experimental and numerical investigation on progressive collapse resistance of reinforced concrete beam column sub-assemblages , 2013 .

[19]  Paolo Riva,et al.  A model for beam–column corner joints of existing RC frame subjected to cyclic loading , 2015 .