Title:
An Investigation on the Seismic Behavior of Deep Reinforced Concrete Coupling Beams
Author(s):
Erwin Lim, Shyh-Jiann Hwang, Ting-Wei Wang, and Yu-Hsuan Chang
Publication:
Structural Journal
Volume:
113
Issue:
2
Appears on pages(s):
1-10
Keywords:
design procedure; diagonally reinforced deep coupling beam; seismic behavior; shear strength
DOI:
10.14359/51687939
Date:
3/1/2016
Abstract:
The ACI 318-14 design procedure for a diagonally reinforced coupling beam is questioned because it proportions the amount
of diagonal reinforcement to meet shear demands by completely neglecting the participation of concrete and failing to recognize any flexural strength that may be developed. This ACI 318-14 design procedure might introduce unnecessary additional forces to the entire coupled wall system. This study proposes that the amount of diagonal reinforcement should be determined using beam flexural theory to satisfy the design moment at the Design Based Earthquake level. Test results of diagonally reinforced deep coupling beam specimens showed that they can preserve ductile flexural behavior up to the Maximum Considered Earthquake level, and part of the shear strength was contributed from concrete in addition to diagonal bars. Finally, a strut-and-tie model to illustrate the involved mechanism is also proposed.
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. Paulay, T., and Binney, J. R., “Diagonally Reinforced Coupling Beams of Shear Walls,” Shear in Reinforced Concrete, SP-42, American Concrete Institute, Farmington Hills, MI, 1974, pp. 579-598.
3. Tassios, T. P.; Moretti, M.; and Bezas, A., “On the Behavior and Ductility of Reinforced Concrete Coupling Beams of Shear Walls,” ACI Structural Journal, V. 93, No. 6, Nov.-Dec. 1996, pp. 711-720.
4. Tegos, I. A., and Penelis, G., “Seismic Resistance of Short Columns and Coupling Beams Reinforced with Inclined Bars,” ACI Structural Journal, V. 85, No. 1, Jan.-Feb. 1988, pp. 82-88.
5. Naish, D.; Fry, A.; Klemencic, R.; and Wallace, J., “Reinforced Concrete Coupling Beams—Part I: Testing,” ACI Structural Journal, V. 110, No. 6, Nov.-Dec. 2013, pp. 1057-1066.
6. Moehle, J., Seismic Design of Reinforced Concrete Buildings, McGraw-Hill Education, New York, 2015, 782 pp.
7. Wang, T. W., “Seismic Details of Reinforced Concrete Coupling Beams for Shear Walls,” master’s thesis, Department of Civil Engineering, National Taiwan University, Taipei, Taiwan, 2011, 234 pp. (in Chinese)
8. Chang, Y. H., “Study on Detailing for Reinforced Concrete Coupling Beams of Shear Walls,” master’s thesis, Department of Civil Engineering, National Taiwan University, Taipei, Taiwan, 2012, 246 pp. (in Chinese)
9. Canbolat, B. A.; Parra-Montesinos, G. J.; and Wight, J. K., “Experimental Study on Seismic Behavior of High-Performance Fiber-Reinforced Cement Composite Coupling Beams,” ACI Structural Journal, V. 102, No. 1, Jan.-Feb. 2005, pp. 159-166.
10. ACI Committee 374, “Acceptance Criteria for Moment Frames Based on Structural Testing (ACI 374.1-05) and Commentary,” American Concrete Institute, Farmington Hills, MI, 2005, 9 pp.
11. Mansour, M.; Hsu, T. T. C.; and Lee, J. Y., “Pinching Effect in Hysteretic Loops of R/C Shear Elements,” Finite Element Analysis of Reinforced Concrete Structures, SP-205, K. Willam and T. Tanabe, eds., American Concrete Institute, Farmington Hills, MI, 2001, pp. 293-321.
12. Hwang, S. J., and Lee, H. J., “Strength Prediction for Discontinuity Regions by Softened Strut-and-Tie Model,” Journal of Structural Engineering, ASCE, V. 128, No. 12, 2002, pp. 1519-1526. doi: 10.1061/(ASCE)0733-9445(2002)128:12(1519)
13. Lima, C.; Martinelli, E.; and Faella, C., “Capacity Models for Shear Strength of Exterior Joints in RC Frames: Experimental Assessment and Recalibration,” Bulletin of Earthquake Engineering, V. 10, No. 3, 2012, pp. 985-1007. doi: 10.1007/s10518-012-9342-2
14. CEB-FIP, “CEB-FIP Model Code for Concrete Structures,” Comite Euro-International du Beton, Federation International de la Precontrainte, 1993.