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http://dx.doi.org/10.12989/sem.2017.64.5.641

Influence of joint modelling on the pushover analysis of a RC frame  

Costa, Ricardo (Department of Civil Engineering, ISISE, University of Coimbra)
Providencia, Paulo (Department of Civil Engineering, INESC Coimbra, University of Coimbra)
Ferreira, Miguel (CERIS, University of Lisbon)
Publication Information
Structural Engineering and Mechanics / v.64, no.5, 2017 , pp. 641-652 More about this Journal
Abstract
In general, conventional analysis and design of reinforced concrete (RC) frame structures overlook the role of beam-column (RCBC) joints. Nowadays, the rigid joint model is one of the most common for RCBC joints: the joint is assumed to be rigid (unable to deform) and stronger than the adjacent beams and columns (does not fail before them). This model is popular because (i) the application of the capacity design principles excludes the possibility of the joint failing before the adjacent beams and (ii) many believe that the actual behaviour of RCBC joints designed according to the seismic codes produced mainly after the 1980s can be assumed to be nominally rigid. This study investigates the relevance of the deformation of RCBC joints in a standard pushover analysis at several levels: frame, storey, element and cross-section. Accordingly, a RC frame designed according to preliminary versions of EN 1992-1-1 and EN 1998-1 was analysed, considering the nonlinear behaviour of beams and columns by means of a standard sectional fibre model. Two alternative models were used for the RCBC joints: the rigid model and an explicit component based nonlinear model. The effect of RCBC joints modelling was found to be twofold: (i) the flexibility of the joints substantially increases the frame lateral deformation for a given load (30 to 50%), and (ii) in terms of seismic performance, it was found that joint flexibility (ii-1) appears to have a minor effect on the force and displacement corresponding to the performance point (seismic demand assessed at frame level), but (ii-2) has a major influence on the seismic demand when assessed at storey, element and cross-section levels.
Keywords
beam-column joint; reinforced concrete cast-in-situ frames structures; pushover analysis; nonlinear behaviour;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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1 Asha, P. and Sundararajan, R. (2014), "Experimental and numerical studies on seismic behaviour of exterior beamcolumn joints", Comput. Concrete, 13(2), 221-234.   DOI
2 Bayhan, B., Ö zdemir, G. and Gülkan, P. (2017), "Impact of joint modeling approach on performance estimates of older-type rc buildings", Earthq. Spectra, 33(3), 1101-1123.   DOI
3 Biddah, A. and Ghobarah, A. (1999), "Modelling of shear deformation and bond slip in reinforced concrete joints", Struct. Eng. Mech., 7(4), 413-432.   DOI
4 Birely, A.C., Lowes, L.N. and Lehman, D.E. (2012), "A model for the practical nonlinear analysis of reinforced-concrete frames including joint flexibility", Eng. Struct., 34, 455-465.   DOI
5 Calvi, G., Magenes, G. and Pampanin, S. (2002), "Relevance of beam-column joint damage and collapse in RC frame assessment", J. Earthq. Eng., 6, 75-100.
6 CEN (1984), "Eurocode 2, Common unified rules for concrete structures", Commission of the European Communities.
7 CEN. (1988), "Eurocode 8, Structures in seismic regions-Design- Part 1, General and Bulding", Commission of the European Communities.
8 CEN (2004a), "EN 1992-1-1, Eurocode 2: Design of Concrete Structures-Part1-1: General Rules and Rules for Buildings", European Committee for Standardisation, Brussels.
9 CEN (2004b), "EN 1998-1, Eurocode 8: Design of structures for earthquake resistance-Part 1: General rules, seismic actions and rules for buildings", European Committee for Standardisation, Brussels.
10 CEN (2005), "EN 1998-3, Eurocode 8: Design of structures for earthquake resistance-Part 3: Assessment and retrofitting of buildings", European Committee for Standardisation, Brussels.
11 Costa, R., Providência, P. and Dias, A. (2016a), "Anchorage models for reinforced concrete beam-column joints under quasi- static loading", ACI Struct. J., 113(3), 503-514.
12 Costa, R., Providência, P. and Dias, A. (2017), "Component based reinforced concrete beam-column joint model", Struct. Concrete, 18(1), 164-176.   DOI
13 Costa, R., Providência, P. and Gomes, F. (2016b), "On the need for classification criteria of cast in situ rc beam-column joints according to their stiffness", Mater. Struct., 49(4), 1299-1317.   DOI
14 Fardis, M.N. (2009), Seismic Design, Assessment and Retrofitting of Concrete Buildings Based on EN-Eurocode 8, Springer.
15 Altoontash, A. (2004), "Simulation and damage models for performance assessment of reinforced concrete beam-column joints", Stanford University.
16 Arêde, A. (1997), "Seismic assessment of reinforced cncrete frame structures with a new flexibility based element", University of Porto.
17 Fardis, M.N., Carvalho, E.C., Fajfar, P. and Pecker, A. (2015), Seismic Design of Concrete Buildings to Eurocode 8, CRC Press.
18 Favvata, M.J., Izzuddin, B.A. and Karayannis, C.G. (2008), "Modelling exterior beam-column joints for seismic analysis of rc frame structures", Earthq. Eng. Struct. Dyn., 37(13), 1527-1548.   DOI
19 Costa, R. (2013), "Beam-column joints modelling for the analysis of reinforced concrete plane frames", University of Coimbra, Portugal. (in Portuguese)
20 Favvata, M.J. and Karayannis, C.G. (2014), "Influence of pinching effect of exterior joints on the seismic behavior of RC frames", Earthq. Struct., 6(1), 89-110.   DOI
21 Ferreira, M. (2011), "EvalS 2.2 (http://evalssoftware.blogspot.pt/)", Leiria.
22 Lui, E.M. (1988), "A practical p-delta analysis method for type FR and PR frames", Eng. J. AISC, 25(3), 85-98.
23 Gala, P., Costa, R., Ferreira, M., Providência, P. and Dias, A. (2016), "The fictitious forces method and its application to the nonlinear analysis of rc skeletal structures", ASCE J. Struct. Eng., 142(11), 04016107.   DOI
24 LaFave, J.M. and Kim, J.H. (2011), "Joint shear behavior prediction for rc beam-column connections", Int. J. Concrete Struct. Mater., 5(1), 57-64.   DOI
25 Lowes, L., Mitra, N. and Altoontash, A. (2004), "A beam-column joint model for simulating the earthquake response of reinforced concrete frames", PEER, University of California.
26 MC90 (1990), "ceb-fip model code 1990-design code", Comite Euro-International du Beton-The International Federation for Structural Concrete, Thomas Telford, London.
27 Negro, P. (1997), "Experimental assessment of the global cyclic damage of framed r/c structures", J. Earthq. Eng., 1(3), 543- 562.   DOI
28 Park, R., Priestley, M.J.N. and Gill, W.D. (1982), "Ductility of squared-confined concrete columns", J. Struct. Div., ASCE, 108(4), 929-950.
29 Negro, P., Verzeletti, G., Magonette, G.E. and Pinto, A.V. (1994), "Tests on a four-storey full-scale r/c frame designed according to Eurocodes 8 e 2: preliminary report", ELSA Laboratory, Luxembourg.
30 Parate, K. and Kumar, R. (2016), "Investigation of shear strength models for exterior RC beam-column joint", Struct. Eng. Mech., 58(3), 475-514.   DOI
31 SEAOC (1999), "Recommended lateral force requirements and commentary", Structural Engineers Association of California, Sacramento.
32 Sharma, A., Reddy, G.R., Vaze, K.K. and Eligehausen, R. (2013), "Pushover experiment and analysis of a full scale non- seismically detailed RC structure", Eng. Struct., 46, 218-233.   DOI
33 Wang, L., Fan, G. and Song, Y. (2015), "Effect of loading velocity on the seismic behavior of RC joints", Earthq. Struct., 8(3), 665-679.   DOI
34 Shayanfar, J. and Bengar, H.A. (2016), "Numerical model to simulate shear behaviour of RC joints and columns", Comput. Concrete, 18(4), 877-901.   DOI
35 Soroushian, P., Obaseki, K. and Rojas, M.C. (1987), "Bearing strength and stiffness of concrete under reinforcing bars", ACI Mater. J., 84(3), 179-184.