Title:
Flexural Behavior of External Beam-Column Reinforced Concrete Assemblages Externally Strengthened with Steel Cages
Author(s):
Giuseppe Campione, Liborio Cavaleri, and Andrea Failla
Publication:
Structural Journal
Volume:
113
Issue:
5
Appears on pages(s):
883-894
Keywords:
beam-column assemblage; cyclic action; failure modes; load-deflection curves; steel angles; strips
DOI:
10.14359/51689014
Date:
9/1/2016
Abstract:
In this paper, an experimental study referring to the flexural behavior of full-scale external beam-column joints externally strengthened with steel angles and strips and subjected to cyclic reversal loading is presented. One control specimen and five other specimens having the same characteristics as the control specimen but strengthened with steel angles and strips along beams and columns, and characterized by different configurations of strengthening in the critical regions, were tested. The control specimen was designed with a weak column and strong beam to reproduce the most common cases of old frame structures in the Mediterranean area, which were designed only for gravity loads and are in need of retrofitting to seismic standards. A detailed discussion of the strengthening technique used and of the mechanical properties of the specimens studied under cyclic loading is presented. It is highlighted that, referring to the case of external beam-column assemblages that are not yet extensively studied in the literature, the steel cage is an effective reinforcing technique to increase the flexural and shear strength of beams and columns, also increasing the energy capacity dissipation and reducing the stiffness degradation.
Related References:
1. Ehsani, M. R., and Wight, J. K., “Exterior Reinforced Beam-to-Column Connection Subjected to Earthquake-Type Loading,” ACI Journal Proceedings, V. 82, No. 4, July-Aug. 1985, pp. 492-499.
2. Hwang, S. J., and Lee, H. J., “Analytical Model for Predicting Shear Strength of Exterior Reinforced Concrete Beam-Column Joints for Seismic Resistance,” ACI Structural Journal, V. 96, No. 5, Sept.-Oct. 1999, pp. 846-858.
3. Hegger, J.; Sherif, A.; and Roeser, W., “Nonlinear Finite Element Analysis of Reinforced Concrete Beam-Column Connections,” ACI Structural Journal, V. 101, No. 5, Sept.-Oct. 2004, pp. 604-614.
4. Attaalla, S. A., “General Analytical Model for Nominal Shear Stress of Type 2 Normal- and High-Strength Concrete Beam-Column Joints,” ACI Structural Journal, V. 101, No. 1, Jan.-Feb. 2004, pp. 65-75.
5. Adam, J. M.; Ivorra, S.; Giménez, E.; Moragues, J. J.; Miguel, P.; Miragall, C.; and Calderón, P. A., “Behaviour of Axially Loaded RC Columns Strengthened by Steel Angles and Strips,” Steel and Composite Structures, V. 7, No. 5, 2007, pp. 405-419. doi: 10.12989/scs.2007.7.5.405
6. Adam, J. M.; Giménez, E.; Calderón, P. A.; Pallarés, F. J.; and Ivorra, S., “Experimental Study of Beam-Column Joints in Axially Loaded RC Columns Strengthened by Steel Angles and Strips,” Steel and Composite Structures, V. 8, No. 4, 2008, pp. 329-342. doi: 10.12989/scs.2008.8.4.329
7. Paulay, T., and Priestley, M. J. N., Seismic Design of Reinforced Concrete and Masonry Buildings, John Wiley & Sons, Inc. 1992, 768 pp.
8. Eurocode 8, “Structures in Seismic Regions,” European Committee for Standardization (CEN), Brussels, Belgium, 2008.
9. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary,” American Concrete Institute, Farmington Hills, MI, 2008, 430 pp.
10. CEB-FIB, “Seismic Assessment and Retrofit of Reinforced Concrete Buildings,” Bulletin No. 24, Task Group 7.1, 2003.
11. Adam, J. M.; Ivorra, S.; Pallarés, F. J.; Giménez, E.; and Calderón, P. A., “Axially Loaded RC Columns Strengthened by Steel Caging. Finite Element Modelling,” Construction & Building Materials, V. 23, No. 6, 2009, pp. 2265-2276. doi: 10.1016/j.conbuildmat.2008.11.014
12. Badalamenti, V.; Campione, G.; and Mangiavillano, M. L., “Simplified Model for Compressive Behavior of Concrete Columns Strengthened by Steel Angles and Strips,” Journal of Engineering Mechanics, ASCE, V. 136, No. 2, 2010, pp. 230-238. doi: 10.1061/(ASCE)EM.1943-7889.0000069
13. Calderón, P. A.; Adam, J. M.; Ivorra, S.; Pallarés, F. J.; and Giménez, E., “Design Strength of Axially Loaded RC Columns Strengthened by Steel Caging,” Materials & Design, V. 30, No. 10, 2009, pp. 4069-4080. doi: 10.1016/j.matdes.2009.05.014
14. Campione, G., “R.C. Columns Strengthened with Steel Angles and Strips: Experiments, Strength Prevision and Design Considerations,” Practice Periodical on Structural Design and Construction, 2012, doi: 10.1061/(ASCE)SC.1943-5576.0000125
15. Campione, G., “Strength and Ductility of R.C. Columns Strengthened with Steel Angles and Battens,” Construction & Building Materials, V. 35, 2012, pp. 800-807. doi: 10.1016/j.conbuildmat.2012.04.090
16. Campione, G., “Load Carrying Capacity of RC Compressed Columns Strengthened with Steel Angles and Strips,” Engineering Structures, V. 40, 2012, pp. 457-465. doi: 10.1016/j.engstruct.2012.03.006
17. Cirtek, L., “RC Columns Strengthened with Bandage—Experimental Programme and Design Recommendations,” Construction & Building Materials, V. 15, No. 8, 2001, pp. 341-349. doi: 10.1016/S0950-0618(01)00015-0
18. Fukuyama, H., and Sugano, S., “Japanese Seismic Rehabilitation of Concrete Buildings after the Hyogoken-Nanbu Earthquake,” Cement and Concrete Composites, V. 22, No. 1, 2000, pp. 59-79. doi: 10.1016/S0958-9465(99)00042-6
19. Garzón-Roca, J.; Ruiz-Pinilla, J.; Adam, J. M.; and Calderón, P. A., “An Experimental Study on Steel-Caged RC Columns Subjected to Axial Force and Bending Moment,” Engineering Structures, V. 33, No. 2, 2011, pp. 580-590. doi: 10.1016/j.engstruct.2010.11.016
20. Garzón-Roca, J.; Adam, J. M.; and Calderón, P. A., “Behaviour of RC Columns Strengthened by Steel Caging under Combined Bending and Axial Loads,” Construction & Building Materials, V. 25, No. 5, 2011, pp. 2402-2412. doi: 10.1016/j.conbuildmat.2010.11.045
21. Garzón-Roca, J.; Adam, J. M.; Calderón, P. A.; and Valente, I. B., “Finite Element Modelling of Steel-Caged RC Columns Subjected to Axial Force and Bending Moment,” Engineering Structures, V. 40, 2012, pp. 168-186. doi: 10.1016/j.engstruct.2012.02.012
22. Giménez, E.; Adam, J. M.; Ivorra, S.; Moragues, J. J.; and Calderón, P. A., “Full-Scale Testing of Axially Loaded RC Columns Strengthened by Steel Angles and Strips,” Advances in Structural Engineering, V. 12, No. 2, 2009, pp. 169-181. doi: 10.1260/136943309788251704
23. Giménez, E.; Adam, J. M.; Ivorra, S.; and Calderón, P. A., “Influence of Strips Configuration on the Behaviour of Axially Loaded RC Columns Strengthened by Steel Angles and Strips,” Materials & Design, V. 30, No. 10, 2009, pp. 4103-4111. doi: 10.1016/j.matdes.2009.05.010
24. Montuori, R., and Piluso, V., “Reinforced Concrete Columns Strengthened with Angles and Strips Subjected to Eccentric Load,” Engineering Structures, V. 31, No. 2, 2009, pp. 539-550. doi: 10.1016/j.engstruct.2008.10.005
25. Oey, H. S., and Aldrete, C. J., “Simple Method for Upgrading an Existing Reinforced Concrete Structure,” Practice Periodical on Structural Design and Construction, ASCE, V. 1, No. 1, 1996, pp. 47-50. doi: 10.1061/(ASCE)1084-0680(1996)1:1(47)
26. Ramírez, J. L., “Ten Concrete Column Repair Methods,” Construction & Building Materials, V. 10, No. 3, 1996, pp. 195-202. doi: 10.1016/0950-0618(95)00087-9