Effect of Load Cycling, FRP Jackets, and Lap-Splicing of Longitudinal Bars on the Effective Stiffness and Ultimate Deformation of Flexure-Controlled RC Members
Publication: Journal of Structural Engineering
Volume 144, Issue 6
Abstract
Practical models for the deformations of flexure-controlled reinforced concrete (RC) members at flexural yielding and at ultimate conditions and for their secant-to-yield-point stiffness were developed using a database of thousands of tests. They apply to monotonic or cyclic lateral loading and seamlessly cover beams; rectangular columns or walls; members with circular, T-, H-, U-, or box sections; conforming or not to seismic design codes; with continuous or lap-spliced bars; and with fiber reinforced polymer (FRP) wrapping or without. Empirical models for the ultimate deformation supplement a physical model based on curvatures and on a plastic hinge length. A procedure to identify the likely failure mode is proposed and applied to a larger database including shear-critical test specimens.
Get full access to this article
View all available purchase options and get full access to this article.
Data Availability Statement
Data generated or analyzed during the study are available from the corresponding author by request.
Acknowledgments
The research leading to these results received funding from the General Secretariat for Research and Technology, through grant ERC-12 of the Operational Program “Education and lifelong learning,” cofunded by the European Union (European Social Fund) and national resources.
References
ASCE. (2007). “Seismic rehabilitation of existing buildings.”, Reston, VA.
Biskinis, D., and Fardis, M. N. (2010a). “Deformations at flexural yielding of members with continuous or lap-spliced bars.” Struct. Concr., 11(3), 127–138.
Biskinis, D., and Fardis, M. N. (2010b). “Flexure-controlled ultimate deformations of members with continuous or lap-spliced bars.” Struct. Concr., 11(2), 93–108.
Biskinis, D., and Fardis, M. N. (2013b). “Models for FRP-wrapped rectangular RC columns with continuous or lap-spliced bars under cyclic lateral loading.” Eng. Struct., 57, 199–212.
Biskinis, D., and Fardis, M. N. (2013a). “Stiffness and cyclic deformation capacity of circular RC columns with or without lap-splices and FRP wrapping.” Bull. Earthquake Eng., 11(5), 1447–1466.
Biskinis, D., Roupakias, G., and Fardis, M. N. (2004). “Degradation of shear strength of RC members with inelastic cyclic displacements.” ACI Struct. J., 101(6), 773–783.
CEN (European Committee for Standardization). (2005). “Eurocode 8: Design of structures for earthquake resistance. Assessment and retrofitting of buildings.”, Brussels, Belgium.
Elwood, K., et al. (2007). “Update to ASCE/SEI41 concrete provisions.” Earthquake Spectr., 23(3), 493–523.
Fardis, M. N., Biskinis, D., Kosmopoulos, A., Bousias, S. N., and Spathis, A.-S. (2005). “Seismic retrofitting techniques for concrete buildings.” Proc., SPEAR Workshop—SPEAR: Seismic performance assessment and rehabilitation, Office of Official Publications of the European Unions, Luxembourg.
fib (Federation Internationale du Beton). (2012). “Model Code 2010.”, Lausanne, Switzerland.
Grammatikou, S., Biskinis, D., and Fardis, M. N. (2015). “Strength, deformation capacity and failure modes of RC walls under cyclic loading.” Bull. Earthquake Eng., 13(11), 3277–3300.
Grammatikou, S., Biskinis, D., and Fardis, M. N. (2016). “Ultimate strain criteria for RC members in monotonic or cyclic flexure.” J. Struct. Eng., 04016046.
Grammatikou, S., Biskinis, D., and Fardis, M. N. (2018a). “Flexural rotation capacity models fitted to test results using different statistical approaches.” Struct. Concr., 19, in press.
Grammatikou, S., Fardis, M. N., and Biskinis, D. (2018b). “Models for the flexure-controlled strength, stiffness and cyclic deformation capacity of concrete columns with smooth bars, including lap-splicing and FRP jackets.” Bull. Earthquake Eng., 16(1), 341–375.
Kosmopoulos, A., and Fardis, M. N. (2007). “Estimation of inelastic seismic deformations in asymmetric multistory RC buildings.” Earthquake Eng. Struct. Dyn., 36(9), 1209–1234.
Lam, L., and Teng, J. G. (2003). “Design-oriented stress-strain model for FRP-confined concrete.” J. Constr. Build. Mater., 17(6–7), 471–489.
Lignos, D., and Krawinkler, H. (2013). “Development and utilization of structural component databases for performance-based earthquake engineering.” J. Struct. Eng., 1382–1394.
Mander, J. B., Priestley, M. J. N., and Park, R. (1988). “Theoretical stress-strain model for confined concrete.” J. Struct. Eng., 1804–1826.
Panagiotakos, T. B., and Fardis, M. N. (1999). “Estimation of inelastic deformation demands in multistory RC buildings.” Earthquake Eng. Struct. Dyn., 28(5), 501–528.
Panagiotakos, T. B., and Fardis, M. N. (2001a). “A displacement-based seismic design procedure of RC buildings and comparison with EC8.” Earthquake Eng. Struct. Dyn., 30(10), 1439–1462.
Panagiotakos, T. B., and Fardis, M. N. (2001b). “Deformations of RC members at yielding and ultimate.” ACI Struct. J., 98(2), 135–148.
Paulay, T., and Priestley, M. J. N. (1992). Seismic design of reinforced concrete and masonry buildings, Wiley, New York.
PEER. (2003). “Peer structural performance database.” ⟨https://nisee.berkeley.edu/spd/⟩ (Oct. 8, 2017).
Peruš, I., Poljanšek, K., and Fajfar, P. (2006). “Flexural deformation capacity of rectangular RC columns determined by the CAE method.” Earthquake Eng. Struct. Dyn., 35(12), 1453–1470.
Sheikh, S. A., and Uzumeri, S. M. (1982). “Analytical model for concrete confinement in tied columns.” J. Struct. Eng., 108(12), 2703–2722.
Song, C., Wang, Y., Puranam, P., Pujol, S., ACI Subcommittee 445B, and Usta, M. (2015). “ACI 445B shear wall database.” ⟨https://datacenterhub.org/resources/142⟩ (Oct. 8, 2017).
Usta, M. (2016). “BRI wall database.” ⟨https://datacenterhub.org/resources/14087⟩ (Oct. 8, 2017).
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 144 • Issue 6 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Dec 21, 2016
Accepted: Nov 21, 2017
Published online: Mar 31, 2018
Published in print: Jun 1, 2018
Discussion open until: Aug 31, 2018
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.