Title:
Performance-Based Shear Design of Exterior Beam- Column Joints with Standard Hooked Bars
Author(s):
Hyeon-Jong Hwang and Hong-Gun Park
Publication:
Structural Journal
Volume:
117
Issue:
2
Appears on pages(s):
67-80
Keywords:
bond-slip; deformation capacity; energy dissipation ratio; exterior beam-column joint; hooked bars; joint hoop bars; joint shear strength; performance-based design
DOI:
10.14359/51721364
Date:
3/1/2020
Abstract:
Under earthquake load, the joint shear strength of exterior beam-column joints without adequate ductility details is significantly degraded as the lateral deformation of the moment frame increases. In the present study, design equations of the joint shear strength and hoop requirement were developed for the performance-based design of exterior beam-column joints. To estimate the requirements of joint shear strength and hoop strength, the effects of the target drift ratio of the overall moment frame and the bar bond parameters on the joint shear strength were considered. To verify the validity, the proposed design method was applied to existing exterior beam-column joint specimens with or without joint hoops. The predictions of the proposed method were compared to the lateral load-drift ratio relationships of test specimens. Further, on the basis of the results of a parametric study, the proposed method was simplified, and a modification of the current ACI 318 method was proposed for application to performance-based design.
Related References:
1. Kitayama, K.; Otani, S.; and Aoyama, H., “Earthquake Resistant Design Criteria for Reinforced Concrete Interior Beam-Column Joints,” Pacific Conference on Earthquake Engineering, New Zealand, V. 1, 1987, pp. 315-326.
2. Leon, R. T., “Interior Joints with Variable Anchorage Lengths,” Journal of Structural Engineering, ASCE, V. 115, No. 9, 1989, pp. 2261-2275. doi: 10.1061/(ASCE)0733-9445(1989)115:9(2261)
3. Hakuto, S.; Park, R.; and Tanaka, H., “Effect of Deterioration of Bond of Beam Bars Passing through Interior Beam-Column Joints of Flexural Strength and Ductility,” ACI Structural Journal, V. 96, No. 5, Sept.-Oct. 1999, pp. 858-864.
4. Meinheit, D. F., and Jirsa, J. O., “Shear Strength of Reinforced Concrete Beam-Column Joints,” Report No. 77-1, Department of Civil Engineering, Structures Research Laboratory, University of Texas at Austin, Austin, TX, Jan. 1977.
5. Bonacci, J., and Pantazopoulou, S., “Parametric Investigation of Joint Mechanics,” ACI Structural Journal, V. 90, No. 1, Jan.-Feb. 1993, pp. 61-71.
6. Hong, S. G.; Lee, S. G.; and Kang, T. H. K., “Deformation-Based Strut-and-Tie Model for Interior Joints of Frames Subject to Load Reversal,” ACI Structural Journal, V. 108, No. 4, July-Aug. 2011, pp. 423-433.
7. Hwang, H. J.; Eom, T. S.; and Park, H. G., “Shear Strength Degradation Model for Performance-Based Design of Interior Beam-Column Joints,” ACI Structural Journal, V. 114, No. 5, Sept.-Oct. 2017, pp. 1143-1154. doi: 10.14359/51700780
8. Feng, F.; Jiang, K.; Hwang, H. J.; and Yi, W. J., “Earthquake Response of Low-Rise RC Moment Frame Structures According to Energy Dissipation Ratio of Beam-Column Joints,” Journal of Structural Integrity and Maintenance, V. 3, No. 1, 2018, pp. 33-43. doi: 10.1080/24705314.2018.1426171
9. 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.
10. Joint ACI-ASCE Committee 352, “Recommendations for Design of Beam-Column Connections in Monolithic Reinforced Concrete Structures (ACI 352R-02),” American Concrete Institute, Farmington Hills, MI, 2002, 38 pp.
11. NZS 3101:2006, “The Design of Concrete Structures,” Standards New Zealand, Wellington, New Zealand, 2006, 698 pp.
12. BS EN 1998-1:2004, “Eurocode 8: Design of Structures for Earthquake Resistance,” British Standards Institution, London, UK, 2004.
13. Park, S., and Mosalam, K. M., “Parameters for Shear Strength Prediction of Exterior Beam-Column Joints Without Transverse Reinforcement,” Engineering Structures, V. 36, 2012, pp. 198-209. doi: 10.1016/j.engstruct.2011.11.017
14. Bakir, P. G., and Boduroglu, H. M., “A New Design Equation for Predicting the Joint Shear Strength of Monotonically Loaded Exterior Beam-Column Joints,” Engineering Structures, V. 24, No. 8, 2002, pp. 1105-1117. doi: 10.1016/S0141-0296(02)00038-X
15. Hegger, J.; Sherif, A.; and Roeser, W., “Nonseismic Design of Beam-Column Joints,” ACI Structural Journal, V. 100, No. 5, Sept.-Oct. 2003, pp. 654-664.
16. Park, S., and Mosalam, K. M., “Analytical Model for Predicting Shear Strength of Unreinforced Exterior Beam-Column Joints,” ACI Structural Journal, V. 109, No. 2, Mar.-Apr. 2012, pp. 149-159.
17. Hwang, S. J., and Lee, H. J., “Analytical Model for Predicting Shear Strengths of Exterior Reinforced Concrete Beam-Column Joints for Seismic Resistance,” ACI Structural Journal, V. 96, No. 5, Sept.-Oct. 1999, pp. 846-858.
18. Hwang, S. J.; Lee, H. J.; Liao, T. F.; Wang, K. C.; and Tsai, H. H., “Role of Hoops on Shear Strength of Reinforced Concrete Beam-Column Joints,” ACI Structural Journal, V. 102, No. 3, May-June 2005, pp. 445-453.
19. Wong, S. H. F., and Kuang, J. S., “Predicting Shear Strength of RC Exterior Beam-Column Joints by Modified Rotating-Angle Softened-Truss Model,” Computers and Concrete, V. 8, No. 1, 2011, pp. 59-70. doi: 10.12989/cac.2011.8.1.059
20. FEMA 356, “Prestandard and Commentary for the Seismic Rehabilitation of Buildings,” Federal Emergency Management Agency, Washington, DC, 2000.
21. ASCE/SEI 41, “Seismic Rehabilitation of Existing Buildings,” American Society of Civil Engineers, Reston, VA, 2007.
22. Hwang, H. J., and Park, H. G., “Requirements of Shear Strength and Hoops for Performance-Based Design of Interior Beam-Column Joints,” ACI Structural Journal, V. 116, No. 2, Mar. 2019, pp. 245-256. doi: 10.14359/51713290
23. Priestley, M. J. N., “Brief Comments of Elastic Flexibility of Reinforced Concrete Frames and Significance to Seismic Design,” Bulletin of the New Zealand National Society for Earthquake Engineering, V. 31, No. 4, 1998, pp. 246-259.
24. Eom, T. S.; Hwang, H. J.; and Park, H. G., “Energy-Based Hysteresis Model for Reinforced Concrete Beam-Column Connections,” ACI Structural Journal, V. 112, No. 2, Mar.-Apr. 2015, pp. 157-166.
25. Hwang, H. J.; Park, H. G.; and Yi, W. J., “Development Length of Standard Hooked Bar Based on Non-Uniform Bond Stress Distribution,” ACI Structural Journal, V. 114, No. 6, Nov.-Dec. 2017, pp. 1637-1648. doi: 10.14359/51700918
26. Hwang, H. J.; Eom, T. S.; and Park, H. G., “Bond-Slip Relationship of Beam Flexural Bars in Interior Beam-Column Joints,” ACI Structural Journal, V. 112, No. 6, Nov.-Dec. 2015, pp. 827-837. doi: 10.14359/51687708
27. Priestley, M. J. N., “Performance Based Seismic Design,” Proceedings, 12th World Conference on Earthquake Engineering, Auckland, New Zealand, 2000.
28. Paulay, T., and Priestley, M. J. N., Seismic Design of Reinforced Concrete and Masonry Buildings, John Wiley & Sons, Inc., New York, 1992.
29. Eom, T., and Park, H., “Elongation of Reinforced Concrete Members Subjected to Cyclic Loading,” Journal of Structural Engineering, ASCE, V. 136, No. 9, 2010, pp. 1044-1054. doi: 10.1061/(ASCE)ST.1943-541X.0000201
30. Vecchio, F. J., and Collins, M. P., “Modified Compression-Field Theory for Reinforced Concrete Elements Subjected to Shear,” ACI Journal Proceedings, V. 83, No. 2, Mar.-Apr. 1986, pp. 219-231.