Title:
Shear Strength of Concrete Composite Beams with Shear Reinforcements
Author(s):
Chul-Goo Kim, Hong-Gun Park, Geon-Ho Hong, Su-Min Kang, and Hyerin Lee
Publication:
Structural Journal
Volume:
114
Issue:
4
Appears on pages(s):
827-837
Keywords:
cast-in-place concrete; composite beam; high-strength concrete; precast concrete; shear reinforcement; shear strength
DOI:
10.14359/51689441
Date:
7/1/2017
Abstract:
Currently, the hybrid construction of precast concrete (PC) and cast-in-place concrete (CIPC) with different concrete strengths is frequently used for precast concrete structures. However, in ACI 318-14, the shear strength of PC-CIPC composite beams is defined as the sum of the respective shear strengths or the lower concrete strength of the two concretes, without clear evidence. In the present study, the shear strengths of simply supported composite beams with shear reinforcement were investigated. The test variables included the cross-sectional area ratio of the precast concrete and cast-in-place concrete, the spacing of the stirrups, and the shear span-depth ratio. The test results showed that the use of highstrength concrete (HSC) in the compression increased the contribution of shear reinforcement by increasing the depth of the tension zone. Thus, the use of HSC in the compression zone significantly increased the shear strength of the composite beams. The shear design equation of ACI 318 safely predicted the shear strengths of the specimens by using the sum of the individual strengths of the two concretes or by using the average concrete strength.
Related References:
1. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14),” American Concrete Institute, Farmington Hills, MI, 2014, 519 pp.
2. Choi, K. K.; Park, H. G.; and Wight, J. K., “Unified Shear Strength Model for Reinforced Concrete Beams-Part I: Development,” ACI Structural Journal, V. 104, No. 2, Mar.-Apr. 2007, pp. 142-152.
3. Tureyen, A. K., and Frosch, R. J., “Concrete Shear Strength: Another perspective,” ACI Structural Journal, V. 100, No. 5, Sept.-Oct. 2003, pp. 609-615.
4. Kotsovos, M. D., and Pavlovic, M. N., Ultimate Limit-State Design of Concrete Structures: A New Approach, Thomas Telford, London, UK, 1999, pp. 67-69.
5. Khuntia, M., and Stojadinovic, B., “Shear Strength of Reinforced Concrete Beams without Transverse Reinforcement,” ACI Structural Journal, V. 98, No. 5, Sept.-Oct. 2001, pp. 648-656.
6. Saemann, J. C., and Washa, G. W., “Horizontal Shear Connections between Precast Beams and Cast-In-Place Slabs,” ACI Journal Proceedings, V. 61, No. 11, Nov. 1964, pp. 1383-1409.
7. Loov, R. E., and Patnaik, A. K., “Horizontal Shear Strength of Composite Concrete Beams with a Rough Interface,” PCI Journal, V. 39, No. 1, 1994, pp. 48-69. doi: 10.15554/pcij.01011994.48.69
8. Kahn, L. F., and Slapkus, A., “Interface Shear in High Strength Composite T-Beams,” PCI Journal, V. 49, No. 4, 2004, pp. 102-110. doi: 10.15554/pcij.07012004.102.110
9. Halicka, A., “Influence New-To-Old Concrete Interface Qualities on the Behavior of Support Zones of Composite Concrete Beams,” Construction and Building Materials, V. 25, Oct. 2011, pp. 4072-4078. doi: 10.1016/j.conbuildmat.2011.04.045
10. Kim, C. G.; Park, H. G.; Hong, G. H.; and Kang, S. M., “Shear strength of Composite Beams with Dual Concrete Strengths,” ACI Structural Journal, V. 113, No. 2, Mar.-Apr. 2016, pp. 263-274. doi: 10.14359/51688061
11. Eurocode 2, “Design of Concrete Structures: Part 1-1: General Rules and Rules for Buildings,” British Standards Institution, British Standards Institution, London, UK, 2004, pp. 29, 84-94.
12. CSA, “Design of Concrete Structures,” Canadian Standard Association, Rexdale, ON, Canada, 2004, pp. 53-66.
13. JSCE, “Standard Specifications for Concrete Structures,” Japan Society of Civil Engineers, Tokyo, Japan, 2010, pp. 154-177.