Title:
Influence of High-Strength Bars on Shear Response of Containment Walls
Author(s):
Giorgio T. Proestos, Gwang-Min Bae, Jae-Yeol Cho, Evan C. Bentz, and Michael P. Collins
Publication:
Structural Journal
Volume:
113
Issue:
5
Appears on pages(s):
917-927
Keywords:
axial stress; compression; high-strength steel; nuclear containment; shear; shell elements; tension; wall
DOI:
10.14359/51688750
Date:
9/1/2016
Abstract:
Current ACI Code shear provisions include some requirements that make the construction of complex heavily reinforced concrete structures more challenging. In particular, the 60 ksi (420 MPa) limit on the usable yield strength of shear reinforcement means it is not permissible to reduce shear reinforcement congestion by using high-strength bars. To investigate the consequences of using highstrength bars, 12 reinforced concrete specimens, representing wall elements of nuclear containment structures, were constructed with varying steel strengths and were loaded under different combinations of shear and biaxial stresses. The results demonstrate that high-strength bars can be effectively used in place of lower-strength reinforcement patterns. For the tested specimens, the ACI 318-14 shear provisions gave very conservative results, while the Modified Compression Field Theory was able to predict the failure shear stresses and strains well, along with the full load deformation response of all elements tested.
Related References:
1. Joint ACI-ASCE Committee 326, “Shear and Diagonal Tension,” ACI Journal Proceedings, V. 59, No. 2, Feb. 1962, pp. 277-334.
2. ACI Committee 318, “Building Code Requirements for Reinforced Concrete (ACI 318-63),” American Concrete Institute, Farmington Hills, MI, 1963, 144 pp.
3. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary,” American Concrete Institute, Farmington Hills, MI, 2014, 519 pp.
4. Vecchio, F. J., and Collins, M. P., “The Modified Compression Field Theory for Reinforced Concrete Elements Subjected to Shear,” ACI Journal Proceedings, V. 83, No. 2, Mar.-Apr. 1986, pp. 219-231.
5. Vecchio, F. J., “Nonlinear Finite Element Analysis of Reinforced Concrete Membranes,” ACI Structural Journal, V. 86, No. 1, Jan.-Feb. 1989, pp. 26-35.
6. Bae, G. M.; Proestos, G. T.; Lee, S.-C.; Bentz, E. C.; Collins, M. P.; and Cho, J.-Y., “In-Plane Shear Behavior of Nuclear Power Plant Wall Elements with High-Strength Reinforcing Bars,” Transactions, SMiRT-22, San Francisco, CA, 2013, 10 pp.
7. Stevens, N. J.; Uzumeri, S. M.; and Collins, M. P., “Reinforced Concrete Subjected to Reverse Cyclic Shear—Experiments and Constitutive Model,” ACI Structural Journal, V. 88, No. 2, Mar.-Apr. 1991, pp. 135-146.
8. CSA A23.3-14, “Design of Concrete Structures,” Canadian Standards Association, Mississauga, ON, Canada, 2014, 290 pp.
9. Proestos, G. T., “Influence of High-Strength Reinforcing Bars on the Behaviour of Reinforced Concrete Nuclear Containment Structures Subjected to Shear,” MASc thesis, Department of Civil Engineering, University of Toronto, Toronto, ON, Canada, 2014, 155 pp.
10. Bae, G. M., “In-Plane Shear Behavior of Reinforced Concrete Elements with High-Strength Materials,” MASc thesis, Department of Civil and Environmental Engineering, Seoul National University, Korea, 2014, 129 pp.
11. Bentz, E. C., Membrane-2012, http://www.ecf.utoronto.ca/~bentz/m2k.htm. (last accessed Aug. 31, 2015).
12. Popovics, S., “A Review of Stress-Strain Relationships for Concrete,” ACI Journal Proceedings, V. 67, No. 3, Mar. 1970, pp. 243-248.
13. Collins, M. P., and Mitchell, D., Prestressed Concrete Structures, Prentice Hall, Englewood Cliffs, NJ, 1991, 766 pp.
14. Bentz, E. C., “Sectional Analysis of Reinforced Concrete,” PhD thesis, Department of Civil Engineering, University of Toronto, Toronto, ON, Canada, 2000, 316 pp.
15. MacGregor, J. G., and Hanson, J. M., “Proposed Changes in Shear Provisions for Reinforced and Prestressed Concrete Beams,” ACI Journal Proceedings, V. 66, No. 4, Apr. 1969, pp. 276-288.
16. Bentz, E. C.; Vecchio, F. J.; and Collins, M. P., “The Simplified MCFT for Calculating the Shear Strength of Reinforced Concrete Elements,” ACI Structural Journal, V. 103, No. 4, July-Aug. 2006, pp. 614-624.
17. Bentz, E. C., and Collins, M. P., “Development of the 2004 Canadian Standards Association (CSA) A23.3 Shear Provisions for Reinforced Concrete,” Canadian Journal of Civil Engineering, V. 33, No. 5, 2006, pp. 521-534. doi: 10.1139/l06-005