Browse > Article
http://dx.doi.org/10.12989/sem.2006.23.1.043

Interface treatment in shotcrete jacketing of reinforced concrete columns to improve seismic performance  

Vandoros, Konstantinos G. (University of Patras, Department of Civil Engineering)
Dritsos, Stephanos E. (University of Patras, Department of Civil Engineering)
Publication Information
Structural Engineering and Mechanics / v.23, no.1, 2006 , pp. 43-61 More about this Journal
Abstract
An investigation of the effectiveness of the interface treatment when column concrete jacketing is performed is presented. Alternative methods of interface connection were used in order to investigate the performance of strengthened concrete columns. These connecting techniques involved roughening the surface of the original column, embedding steel dowels into the original column and a combination of these two techniques. The experimental program included three strengthened specimens, one original specimen (unstrengthened) and one as-built specimen (monolithic). The specimens represented half height full-scale old Greek Code (1950's) designed ground floor columns of a typical concrete frame building. The jackets of the strengthened specimens were constructed with shotcrete. All specimens were subjected to displacement controlled earthquake simulation loading. The seismic performance of the strengthened specimens is compared to both the original and the monolithic specimens. The comparison was performed in terms of strength, stiffness and hysteretic response. The results demonstrate the effectiveness of the strengthening methods and indicate that the proper construction of a jacket can improve the behaviour of the specimens up to a level comparable to monolithic behaviour. It was found that different methods of interface treatment could influence the failure mechanism and the crack patterns of the specimens. It was also found that the specimen that combined roughening with dowel placement performed the best and all strengthened columns were better at dissipating energy than the monolithic specimen.
Keywords
concrete columns; strengthening; shotcrete; jacketing; interface connection; roughening; dowels; seismic performance;
Citations & Related Records

Times Cited By Web Of Science : 7  (Related Records In Web of Science)
Times Cited By SCOPUS : 9
연도 인용수 순위
1 ATC 40 (1996), ' Seismic evaluation and retrofit of concrete buildings ' , Applied Technology Council, 1,California, USA
2 Bett, B.J., Klingner, R.E. and Jirsa, J.O. (1988), ' Lateral load response of strengthened and repaired reinforced concrete columns ', Struct. J., ACI, 85(5), 499-508
3 Bousias, S., Spathis, A.L. and Fardis, M.N. (2004), ' Seismic retrofitting of columns with lap-splices via RC jackets ', Proc. of Thirteenth World Conf. on Earthquake Engineering, Vancouver, Canada, Paper No 1937
4 CEB Bul. N° 162 (1983), ' Assessment of concrete structures and design procedures for upgrading (Redesign) ', Bulletin D'Information, CEB, Paris
5 Chronopoulos, M., Scarpas, A. and Tassios, T.P. (1994), ' Response of original and repaired reinforced concrete joints under cyclic imposed deformations ', Proc. of Tenth European Conf. on Earthquake Engineering, 3, Vienna, Austria, 2261-2267
6 Dritsos, S.E., Taylor, C.A and Vandoros, K.G (1997), ' Seismic strengthening of reinforced concrete structures by concrete jacketing ', Proc. of Seventh Int. Conf. on Structural Faults and Repair, 3, Edinburgh, UK, 391-402
7 Dritsos, S.E., Vandoros, K.G and Taylor, C.A. (1998), ' Shaking table tests on a retrofitted, small scale, reinforced concrete model' , Proc. of Sixth SECED Conf. on Seismic Design Practice Into the Next Century, Oxford, UK, 525-533
8 Dritsos, S.E. (2001), Repair and Strengthening of Reinforced Concrete Structures, Patras, Greece, (in Greek)
9 EC 2, (2004), European (draft) Standard EN 1992-1-1: Eurocode 2 - Design of Concrete Structures - Part 1-1: General Rules and Rules for Buildings; European Committee for Standardisation (CEN), Brussels
10 Gomes, A.M. and Appleton, J. (1998), ' Repair and strengthening of reinforced concrete elements under cyclic loading ', Proc. of Eleventh European Conf. on Earthquake Engineering, Paris, France, CD Proceedings
11 Rodriguez, M. and Park, R. (1994), ' Seismic load tests of reinforced concrete columns strengthened by jacketing ', Struct. J., ACI, 91(2),150-159
12 Tassios, T.P. (2004), Postgraduate Studies Course Notes on: Theory for Design of Repaired and Strengthened Structures, School of Civil Engineering, National Technical University of Athens, Athens. (In Greek)
13 Tsonos, A.G (1999), ' Lateral load response of strengthened reinforced concrete beam-to-column joints ', Struct. J., ACI, 96(1), 46-56
14 Vandoros, K.G. (2005),' Experimental investigation of the behavior of columns strengthened with reinforced concrete jackets, under cyclic loads ', PhD Thesis, Dept. of Civil Engineering, University of Patras, Greece. (in Greek)
15 GRECO (2004), First Draft Version ' Greek Retrofitting Code' by the Greek Organization for Seismic Planning and Protection, Greek Ministry for Environmental Planning and Public Works, Athens. (In Greek)
16 Ersoy, D., Tankut, A.T. and Suleiman, R. (1993), ' Behaviour of jacketed columns', Struct. J. ACI, 90(3), 288-293