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http://dx.doi.org/10.11112/jksmi.2011.15.3.186

Enhancing Seismic Performance of Exterior R.C. Beam-Column Connections Using Headed Bars  

Shin, Hyun Oh (고려대학교 건축사회환경공학부)
Yang, Jun Mo (고려대학교 BK21건설글로벌리더사업단)
Yoon, Young Soo (고려대학교 건축사회환경공학부)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.15, no.3, 2011 , pp. 186-194 More about this Journal
Abstract
The reinforced concrete beam-column connections are in lack of constructability and are likely to show anchorage failure because of the complex details of joint regions. Under seismic loads, a destruction of the column or the beam-column joint leads to collapse of the whole structures. For this reason, the safety of structures has to be guaranteed by following procedures which are based on the strong column-weak beam design concept: 1) failure of beam by generating plastic hinge in the beam maintained a certain distance from the surface of column, 2) failure of column or beam-column joint. In this study, headed bars were used as longitudinal reinforcements of beam and joint reinforcements in order to improve the strength and constructability of joint and to relocate plastic hinge. The finite element analyses (FEAs) were performed to the reinforced concrete beam-column joints utilizing headed bar reinforcements. To verify the availability of the analysis models, the FEAs for experimental tests performed by previous researchers were conducted and compared with the experimental results. Additional variables are also considered to confirm the excellence of headed bars. Analysis results indicate that the constructability of beam-column connections can be improved by using headed bars for the full anchorage of longitudinal reinforcements of beam under similar structural performance. In addition, the plastic hinge was relocated to the intended place by using headed bars as joint reinforcements. Under cyclic displacement loading, the energy dissipation capacity and ultimate stress were increased and the decrease in stiffness was minimized.
Keywords
Beam-column connections; Headed bars; Finite element analysis; Plastic hinge; Seismic performance;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 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, vol. 102, No. 3, 2005, pp.445-453.
2 Joint ACI-ASCE Committee 352, Recommendations for Design of Beam-Coulmn Connections in Monolithic Reinforced Concrete Structures, American Concrete Institute, Farmington Hills, MI. 2002.
3 Kang, T., Shin, M., Mitra, N. and Bonacci, J. F., "Seismic Design of Reinforced Concrete Beam-Column Joints with Headed Bars", ACI Structural Journal, vol. 106, No. 6, 2009, pp.868-877.
4 Lee, H. J. and Ko, J. W., "Eccentric Reinforced Concrete Beam-Column Connections Subjected to Cyclic Loading in Principal Directions", ACI Structural Journal, vol. 104, No. 4, 2007, pp.459-467.
5 Medhekar, M. S., Rashad, G. E. and Jain, S. K., "Shear Reinforcement for Aseismic Design of Flexural members", Indian Concrete Journal, vol. 66, No. 7, 1992, pp.319-324.
6 Murty, C. V. R., Rai, D. C., Bajpai, K. K. and Jain, S. K., "Effectiveness of Reinforcement Details in Exterior Reinforced Concrete Beam-Coulmn Joints for Earthquake Resistance", ACI Structural Journal, vol. 100, No. 2, 2003, pp.149-156.
7 Parra-Montesinos, G. J., "High-Performance Fiber-Reinforced Cement Composites: An Alternative for Seismic Design of Structures", ACI Structural Journal, vol. 102, No. 5, 2005, pp.668-675.
8 TNO Building and Construction Research, DIANA User's Manual(release 8.1), TNO Bulding and Construction Research, Delft, 2002.
9 Wallace, J. W., McConnell, S. W., Gupta, P. and Cote, P. A., "Use of Headed Reinforcement in Beam-Column Joints Subjected to Earthquake Loads", ACI Structural Journal, vol. 95, No. 5, 1998, pp.590-606.
10 Wang, Y. C. and Hsu, K., "Shear Strength of RC Jacketed Interior Beam-Column Joints without Horizontal Shear Reinforcement", ACI Structural Journal, vol. 106, No. 2, 2009, pp.222-232.
11 김민, 이기학, 이재홍, 우성우, 이정원, "CFRP를 이용한 비내진 철근콘크리트 외부 보-기둥 접합부의 내진 보강", 한국콘크리트학회논문집, 제18권 6호, 2006, pp.729-736.
12 Chun, S. C. and Lee, S. H., Kang, T., Oh, B. and Wallance, J. W., "Mechanical Anchorage in Exterior Beam-Column Joints Subjected to Cyclic Loading", ACI Structural Journal, vol. 104, No. 1, 2007, pp.102-112.
13 ASTM International, Standard Specification for headed Steel Bars for Concrete Reinforcement, ASTM International Standard Worldwide, West Conshohocken, Pa, 2009, p.6.
14 American Concrete Institute (ACI), Building code requirements for structural concrete and commentary, ACI 318-08 and ACI318R-08, Farmington Hill, MI, 2008, p.33.
15 Brooke, N. J. Megget, L. M. and Ingham, J. M., "Bond Performance of Interior Beam-Column Joints with High-Strength Reinforcement", ACI Structural Journal, vol. 103, No. 4, 2006, pp.596-603.
16 Chutarat, N. and Aboutaha, R. S., "Cyclic Response of Exterior Reinforced Concrete Beam-Column Joints Reinforced with Headed Bars-Experimental Investigation", ACI Structural Journal, vol. 100, No. 2, 2003, pp.259-266.