Shear Strength of Exterior Beam-Column Joints with Limited Ductility Details
Publication: Journal of Structural Engineering
Volume 146, Issue 2
Abstract
The seismic performance of exterior beam-column joints in low-rise buildings with limited ductility details was investigated. Seven exterior beam-column connection specimens were prepared for cyclic loading tests, and the major test parameters were the column depth and joint shear reinforcement details. In the specimens, joint shear failure occurred before beam or column yielding. The shear strength of the exterior joints increased as the column depth (i.e., joint depth) and the area of shear reinforcements increased. Despite the nonseismic reinforcement details, U-shaped bars and 90°-hooked hoops with a spacing of one-third of the column depth increased the joint shear strength. As a result, flexural beam yielding occurred in several specimens. The joint shear strengths were compared with the predictions by current design codes, and the effects of the test parameters were investigated. Based on the results, a shear strength equation for exterior joints was proposed that is applicable to nonseismic details.
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Acknowledgments
This research was supported by Basic Science Research Programs through the National Research Foundation of Korea, funded by the Ministry of Education (NRF-2018R1A6A1A07025819), and R&D Policy Infra program funded by the Ministry of Land, Infrastructure, and Transportation (Code No. 15AUDP-B066083-03). The authors express gratitude for their support.
References
ACI (American Concrete Institute). 2005. Acceptance criteria for moment frames based on structural testing and commentary. ACI 374.1. Farmington Hills, MI: ACI.
ACI (American Concrete Institute). 2014. Building code requirements for structural concrete and commentary. ACI 318. Farmington Hills, MI: ACI.
ASCE. 2017. Seismic evaluation and retrofit of existing buildings. ASCE/SEI 41. Reston, VA: ASCE.
CEN (European Committee for Standardization). 2004. Design of structures for earthquake resistance. Eurocode 8. Brussels, Belgium: CEN.
Clyde, C., C. P. Pantelides, and L. D. Reaveley. 2000. Performance-based evaluation of exterior reinforced concrete buildings joints for seismic excitation. Berkeley, CA: Univ. of California.
De Risi, M. T., P. Ricci, and G. M. Verderame. 2017. “Modelling exterior unreinforced beam-column joints in seismic analysis of non-ductile RC frames.” Earthquake Eng. Struct. Dyn. 46 (6): 899–923. https://doi.org/10.1002/eqe.2835.
De Risi, M. T., P. Ricci, G. M. Verderame, and G. Manfredi. 2016. “Experimental assessment of unreinforced exterior beam–column joints with deformed bars.” Eng. Struct. 112 (Apr): 215–232. https://doi.org/10.1016/j.engstruct.2016.01.016.
Ehsani, M. R., and J. K. Wight. 1985. “Exterior reinforced concrete beam-to-column connections subjected to earthquake-type loading.” ACI J. 82 (4): 492–499.
FEMA. 2000. Prestandard and commentary for the seismic rehabilitation of buildings. FEMA 356. Washington, DC: FEMA.
Hassan, W. M. 2011. “Analytical and experimental assessment of seismic vulnerability of beam-column joints without transverse reinforcement in concrete buildings.” Ph.D. dissertation, Dept. of Civil and Environmental Engineering, Univ. of California.
Hassan, W. M., and J. P. Moehle. 2018. “Shear strength of exterior and corner beam-column joints without transverse reinforcement.” ACI Struct. J. 115 (6): 1720–1728. https://doi.org/10.14359/51702416.
Hwang, S. J., H. J. Lee, T. F. Liao, K. C. Wang, and H. H. Tsai. 2005. “Role of hoops on shear strength of reinforced concrete beam-column joints.” ACI Struct. J. 102 (3): 445–453.
Jeon, J. S., A. Shafieezadeh, and R. DesRoches. 2014. “Statistical models for shear strength of RC beam-column joints using machine-learning techniques.” Earthquake Eng. Struct. Dyn. 43 (14): 2075–2095. https://doi.org/10.1002/eqe.2437.
Kaku, T., and H. Asakusa. 1991. “Ductility estimation of exterior beam-column subassemblages in reinforced concrete frames.” Spec. Publ. 123: 167–186.
KCI (Korean Concrete Institute). 2012. Building code for structural concrete and commentary. KCI 2012. Seoul: KCI.
Kim, J., and J. M. LaFave. 2008. “Probabilistic joint shear strength models for design of RC beam-column connections.” ACI Struct. J. 105 (6): 770–780. https://doi.org/10.14359/20105.
Kuang, J. S., and H. F. Wong. 2013. “Horizontal hoops in non-seismically designed beam–column joints.” HKIE Trans. 20 (3): 164–171. https://doi.org/10.1080/1023697X.2013.812388.
Lin, C. M. 2000. Seismic behaviour and design of reinforced concrete interior beam column joints. Christchurch, New Zealand: Univ. of Canterbury.
Murty, C., D. C. Rai, K. Bajpai, and S. K. Jain. 2003. “Effectiveness of reinforcement details in exterior reinforced concrete beam-column joints for earthquake resistance.” ACI Struct. J. 100 (2): 149–156.
NZS (New Zealand Standards). 2004. Structural design actions. 5: Earthquake actions. NZS 11705. Wellington, New Zealand: NZS.
Pantelides, C. P. 2002. Assessment of reinforced concrete building exterior joints with substandard details. Berkeley, CA: Univ. of California.
Pantelides, C. P., C. Clyde, and L. D. Reaveley. 2002. “Performance-based evaluation of reinforced concrete building exterior joints for seismic excitation.” Earthquake Spectra 18 (3): 449–480. https://doi.org/10.1193/1.1510447.
Pantelides, C. P., J. Hansen, M. J. Ameli, and L. D. Reaveley. 2017. “Seismic performance of reinforced concrete building exterior joints with substandard details.” J. Struct. Integrity Maint. 2 (1): 1–11. https://doi.org/10.1080/24705314.2017.1280589.
Park, S., and K. M. Mosalam. 2012a. “Analytical model for predicting shear strength of unreinforced exterior beam-column joints.” ACI Struct. J. 109 (2): 149–159.
Park, S., and K. M. Mosalam. 2012b. “Parameters for shear strength prediction of exterior beam-column joints without transverse reinforcement.” Eng. Struct. 36 (Mar): 198–209. https://doi.org/10.1016/j.engstruct.2011.11.017.
Park, S., and K. M. Mosalam. 2013. “Experimental investigation of nonductile RC corner beam-column joints with floor slabs.” J. Struct. Eng. 139 (1): 1–14. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000591.
Pauletta, M., D. Di Luca, and G. Russo. 2015. “Exterior beam column joints: Shear strength model and design formula.” Eng. Struct. 94 (Jul): 70–81. https://doi.org/10.1016/j.engstruct.2015.03.040.
Tsonos, A. G., I. A. Tegos, and G. G. Penelis. 1992. “Seismic resistance of Type-2 exterior beam-column joints reinforced with inclined bars.” ACI Struct. J. 89 (1): 3–12. https://doi.org/10.14359/1278.
Wang, G. L., J. G. Dai, and J. G. Teng. 2012. “Shear strength model for RC beam-column joints under seismic loading.” Eng. Struct. 40 (Jul): 350–360. https://doi.org/10.1016/j.engstruct.2012.02.038.
Wong, H. F., and J. S. Kuang. 2008. “Effects of beam-column depth ratio on joint seismic behaviour.” Proc. Inst. Civ. Eng. Struct. Build. 161 (2): 91–101. https://doi.org/10.1680/stbu.2008.161.2.91.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 2 • February 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Oct 17, 2018
Accepted: Jun 2, 2019
Published online: Dec 10, 2019
Published in print: Feb 1, 2020
Discussion open until: May 10, 2020
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