Title:
Drift Capacity of Reinforced Concrete Columns
Author(s):
Samyog Shrestha and Santiago Pujol
Publication:
Structural Journal
Volume:
120
Issue:
1
Appears on pages(s):
215-224
Keywords:
ACI 318-19; ACI 369; cyclic loading; drift capacity; reinforced concrete (RC) columns
DOI:
10.14359/51736124
Date:
1/1/2023
Abstract:
An empirical method for estimating the drift capacity of reinforced concrete (RC) columns is proposed. It is applicable to columns in which concrete disintegration attributable to the effects of shear stresses is expected after yielding of longitudinal reinforcement. It is based on test data from 31 test columns that were subjected to five or fewer displacement cycles after reaching maximum lateral load and before a reduction in lateral resistance of 20%. The ratio of measured to estimated drift capacity (defined as the lateral displacement
of the column corresponding to a 20% reduction in lateral
resistance) obtained using the proposed method ranges from 0.95 to 1.7 for the 31 specimens selected. The reliability of the proposed expression is compared against the reliability of existing methods to estimate drift capacity. Using a consistent set of data, the proposed expression produced less variability in estimating drift capacity compared to existing methods. The work also addresses whether drift capacity is affected by the number of load cycles (displacement reversals) applied after the maximum lateral load is reached. Test results from 28 additional test columns were considered. These
columns were subjected to more than five displacement reversals after the peak lateral load was reached and before loss of lateral resistance exceeding 20% of the peak load. Within the scope of this study, the drift capacity of columns with rectangular cross section was observed to decrease, in general, by more than 30% when 10 or more displacement cycles occurred after the peak lateral load was reached. On the other hand, the drift capacity of columns with circular cross section was not observed to be sensitive to the number
of displacement cycles after peak load.
Related References:
1. Blume, J. A.; Newmark, N. M.; and Corning, L. H., “Design of Multistory Reinforced Concrete Buildings for Earthquake Motions,” V. 4, Portland Cement Association, Skokie, IL, 1961.
2. Sozen, M. A., “Review of Earthquake Response of Reinforced Concrete Buildings with a View to Drift Control,” State-of-the-Art in Earthquake Engineering, Turkish National Committee on Earthquake Engineering, Istanbul, Turkey, 1981, pp. 383-418.
3. Westergaard, H. M., “Measuring Earthquake Intensity in Pounds per Square Foot,” Engineering News-Record, V. 110, No. 16, 1933, 504 pp.
4. Sozen, M. A., “Drift-Driven Design for Earthquake Resistance of Reinforced Concrete,” UCB/EERC-97/05, The EERC-CUREe Symposium in Honor of Vitelmo V. Bertero, Pacific Earthquake Engineering Research Center, University of California, Berkeley, Berkeley, CA, 1997, pp. 1-8.
5. Pujol, S.; Ramirez, J. A.; and Sözen, M. A., “Drift Capacity of Reinforced Concrete Columns Subjected to Cyclic Shear Reversals,” Seismic Response of Concrete Bridges, SP-187, K. Krishnan, ed., American Concrete Institute, Farmington Hills, MI, 1999, pp. 255-274.
6. Elwood, K. J., and Moehle, J. P., “Drift Capacity of Reinforced Concrete Columns with Light Transverse Reinforcement,” Earthquake Spectra, V. 21, No. 1, 2005, pp. 71-89. doi: 10.1193/1.1849774
7. Berry, M. P., and Eberhard, M. O., “Practical Performance Model for Bar Buckling,” Journal of Structural Engineering, ASCE, V. 131, No. 7, 2005, pp. 1060-1070. doi: 10.1061/(ASCE)0733-9445(2005)131:7(1060)
8. Ghannoum, W. M., and Matamoros, A. B., “Nonlinear Modeling Parameters and Acceptance Criteria for Concrete Columns,” Seismic Assessment of Existing Reinforced Concrete Buildings, SP-297, K. J. Elwood, J. Dragovich, and I. Kim, eds., American Concrete Institute, Farmington Hills, MI, 2014, pp. 1-24.
9. Pujol, S.; Irfanoglu, A.; and Puranam, A., Drift-Driven Design of Buildings: Mete Sozen’s Works on Earthquake Engineering, CRC Press, Boca Raton, FL, 2022, 318 pp.
10. Shrestha, S.; Carrillo, J.; Sezen, H.; and Pujol, S., “Shear Strength of Shear-Controlled Columns under Cyclic Loading,” ACI Structural Journal, V. 119, No. 3, May 2022, pp. 129-140.
11. Wight, J. K., and Sozen, M. A., “Shear Strength Decay in Reinforced Concrete Columns Subjected to Large Deflection Reversals,” Structural Research Series No. 403, University of Illinois at Urbana-Champaign, Urbana, IL, 1973, 312 pp.
12. Ghannoum, W.; Sivaramakrishnan, B.; Pujol, S.; Catlin, A. C.; Fernando, S.; Yoosuf, N.; and Wang, Y., “NEES Database: ACI 369 Rectangular Columns,” 2012, https://datacenterhub.org/dataviewer/view/neesdatabases:db/aci_369_rectangular_column_database. (last accessed Dec. 16, 2022)
13. Ghannoum, W.; Sivaramakrishnan, B.; Pujol, S.; Catlin, A. C.; Wang, Y.; Yoosuf, N.; and Fernando, S., “NEES Database: ACI 369 Circular Columns,” 2012, https://datacenterhub.org/dataviewer/view/neesdatabases:db/aci_369_circular_column_database. (last accessed Dec. 13, 2022)
14. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary (ACI 318R-19) (Reapproved 2022),” American Concrete Institute, Farmington Hills, MI, 2019, 624 pp.
15. ACI Committee 369, “Standard Requirements for Seismic Evaluation and Retrofit of Existing Concrete Buildings (ACI 369.1-17) and Commentary,” American Concrete Institute, Farmington Hills, MI, 2017, 110 pp.
16. Richter, B., and Pujol, S., “A New Perspective on the Tensile Strength of Lap Splices in Reinforced Concrete Members,” 2016, https://datacenterhub.org/deedsdv/publications/view/407. (last accessed Dec. 16, 2022)
17. Roy, H. E. H., and Sozen, M. A., “Ductility of Concrete,” Flexural Mechanics of Reinforced Concrete, SP-12, American Concrete Institute, Farmington Hills, MI, 1965, pp. 213-235.