Title:
Effective Compressive Strength of Reinforced Concrete Columns with Intervening Floor Slab
Author(s):
Seung-Ho Choi, Deuckhang Lee, and Kang Su Kim
Publication:
Structural Journal
Volume:
119
Issue:
1
Appears on pages(s):
183-198
Keywords:
column; effective compressive strength; panel zone; reinforced concrete (RC); slab
DOI:
10.14359/51733005
Date:
1/1/2022
Abstract:
This study presents an analytical model for estimating the effective compressive strength of a reinforced concrete (RC) column intersected by a floor slab made of relatively low-grade concrete. The proposed model is based on a theoretically sound background and considers the force equilibrium and strain compatibility conditions in the vicinity of the interface between the upper and lower columns and an intervening slab. By using the parametric study results obtained from finite element analyses, the effects of the confinement provided by the surrounding slab and the secondary stresses induced by the Poisson effect in the columns and slab panel zone were formulated in detail. A simple design expression was then derived for the better applicability of the proposed method for the estimation of the effective compressive strength of the exterior and interior columns with an intervening slab, in a unified manner. To verify the proposed model, the test results of 81 exterior columns and 24 interior columns were collected from the literature. It was found that the effective compressive strengths obtained by the proposed methods were in good agreement with these test results.
Related References:
1. Choi, S. H., “Effective Compressive Strengths of High Strength Concrete Columns Intersected by Normal Strength Concrete Slab,” PhD dissertation, Department of Architectural Engineering, University of Seoul, Seoul, South Korea, 2019.
2. Lee, S. C., and Mendis, P., “Behavior of High-Strength Concrete Corner Columns Intersected by Weaker Slabs with Different Thicknesses,” ACI Structural Journal, V. 101, No. 1, Jan.-Feb. 2004, pp. 11-18.
3. Choi, S.-H.; Lee, D. H.; Hwang, J.-H.; Oh, J.-Y.; Kim, K. S.; and Kim, S.-H., “Effective Compressive Strengths of Corner and Exterior Concrete Columns Intersected by Slabs with Different Compressive Strengths,” Archives of Civil and Mechanical Engineering, V. 18, No. 3, 2018, pp. 731-741. doi: 10.1016/j.acme.2017.11.001
4. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary (ACI 318R-19),” American Concrete Institute, Farmington Hills, MI, 2019, 624 pp.
5. CSA A23.3:19, “Design of Concrete Structures,” CSA Group, Toronto, ON, Canada, 2019.
6. Bianchini, A. C.; Woods, R. E.; and Kesler, C. E., “Effect of Floor Concrete Strength on Column Strength,” ACI Journal Proceedings, V. 56, No. 5, May 1960, pp. 1149-1170.
7. Gamble, W. L., and Klinar, J. D., “Tests of High-Strength Concrete Columns with Intervening Floor Slabs,” Journal of Structural Engineering, ASCE, V. 117, No. 5, 1991, pp. 1462-1476. doi: 10.1061/(ASCE)0733-9445(1991)117:5(1462)
8. Kayani, M. K., “Load Transfer from High-Strength Concrete Columns through Lower Strength Concrete Slabs,” PhD dissertation, Department of Civil Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, 1992.
9. Shu, C. C., and Hawkins, N. M., “Behavior of Columns Continuous through Concrete Floors,” ACI Structural Journal, V. 89, No. 4, July-Aug. 1992, pp. 405-414.
10. Ospina, C. E., and Alexander, S. D. B., “Transmission of High Strength Concrete Column Loads through Concrete Slabs (Structural Engineering Report No. 214),” Department of Civil Engineering, University of Alberta, Edmonton, AB, Canada, 1997, 201 pp.
11. Ospina, C. E., and Alexander, S. D. B., “Transmission of Interior Concrete Column Loads through Floors,” Journal of Structural Engineering, ASCE, V. 124, No. 6, 1998, pp. 602-610. doi: 10.1061/(ASCE)0733-9445(1998)124:6(602)
12. Shin, H.-O.; Yoon, Y.-S.; Cook, W. D.; and Mitchell, D., “Enhancing the Performance of UHSC Columns Intersected by Weaker Slabs,” Engineering Structures, V. 127, 2016, pp. 359-373. doi: 10.1016/j.engstruct.2016.08.065
13. ACI Committee 318, “Building Code Requirements for Reinforced Concrete (ACI 318-63),” American Concrete Institute, Farmington Hills, MI, 1963, 144 pp.
14. Shah, A. A.; Dietz, J.; Tue, N. V.; and Koenig, G., “Experimental Investigation of Column-Slab Joints,” ACI Structural Journal, V. 102, No. 1, Jan.-Feb. 2005, pp. 103-113.
15. Choi, S.-H.; Hwang, J.-H.; Han, S.-J.; Kang, H.; Lee, J.-Y.; and Kim, K. S., “Failure Characteristics of Columns Intersected by Slabs with Different Compressive Strengths,” Structural Engineering and Mechanics, V. 74, No. 3, 2020, pp. 435-443.
16. Choi, S.-H.; Hwang, J.-H.; Han, S.-J.; Cho, H.-C.; Kim, J. H.; and Kim, K. S., “Simplified Effective Compressive Strengths of Columns with Intervening Floor Slabs,” International Journal of Concrete Structures and Materials, V. 14, Article No. 42, 2020, 11 pp. doi: 10.1186/s40069-020-00419-8
17. Lee, D. H.; Han, S.-J.; and Kim, K. S., “Dual Potential Capacity Model for Reinforced Concrete Beams Subjected to Shear,” Structural Concrete, V. 17, No. 3, 2016, pp. 443-456. doi: 10.1002/suco.201500165
18. Lee, D. H.; Han, S.-J.; Hwang, J.-H.; Ju, H. J.; and Kim, K. S., “Simplification and Verification of Dual Potential Capacity Model for Reinforced Concrete Beams Subjected to Shear,” Structural Concrete, V. 18, No. 2, 2017, pp. 259-277. doi: 10.1002/suco.201600055
19. Lee, D. H.; Kim, K. S.; Han, S.-J.; Zhang, D.; and Kim, J., “Dual Potential Capacity Model for Reinforced Concrete Short and Deep Beams Subjected to Shear,” Structural Concrete, V. 19, No. 1, 2018, pp. 76-85. doi: 10.1002/suco.201700202
20. Kupfer, H.; Hilsdorf, H. K.; and Rusch, H., “Behavior of Concrete under Biaxial Stresses,” ACI Journal Proceedings, V. 66, No. 8, Aug. 1969, pp. 656-666.
21. Richart, F. E.; Brandtzæg, A.; and Brown, R. L., “A Study of the Failure of Concrete under Combined Compressive Stresses (University of Illinois Engineering Experiment Station, Bulletin Series No. 185),” University of Illinois Bulletin, V. 26, No. 12, University of Illinois at Urbana-Champaign, Champaign, IL, 1928, 110 pp.
22. Collins, M. P., and Mitchell, D., Prestressed Concrete Structures, Prentice Hall, Englewood Cliffs, NJ, 1991, 766 pp.
23. Hognestad, E., “Study of Combined Bending and Axial Load in Reinforced Concrete Members (University of Illinois Engineering Experiment Station, Bulletin Series No. 399),” University of Illinois Bulletin, V. 49, No. 22, University of Illinois at Urbana-Champaign, Champaign, IL, 1951, 134 pp.
24. McHarg, P. J.; Cook, W. D.; Mitchell, D.; and Yoon, Y.-S., “Improved Transmission of High-Strength Concrete Column Loads through Normal Strength Concrete Slabs,” ACI Structural Journal, V. 97, No. 1, Jan.-Feb. 2000, pp. 149-157.
25. Lee, J.-H.; Yang, J.-M.; Lee, S.-H.; and Yoon, Y.-S., “Improved Transmission of UHSC Column Loads by Puddling of Fiber Reinforced UHSC,” Journal of the Korea Concrete Institute, V. 19, No. 2, 2007, pp. 209-216. doi: 10.4334/JKCI.2013.25.2.209