Joint Shear Deformation and Beam Rotation in RC Beam-Column Eccentric Connections
Abstract
This paper discusses joint shear deformation and beam rotation for RC beam-column eccentric connections. Two eccentric connections were designed according to ACI 318-14 and ACI-352 and their half scaled models were constructed sequentially to introduce a cold joint at the beam column interface. Specimen having eccentricity equal to bc/8 (12.5% of column width) and bc/4 (25% of column width) were named as specimen 1 and specimen 2 respectively. The specimens were tested under quasi static full cyclic loading. The results are presented in the form of beam rotation versus drift and beam rotation versus lateral load plots. In addition, joint shear deformation versus drift is also plotted for both specimens. Careful observation of the damage pattern revealed that bond slip occurred at 2.5% drift in both specimens with no yielding of beam longitudinal bars in the joint core due to the presence of construction joint. An increase in out of plane rotation was observed with increase in eccentricity. However, in plane rotation was more in specimen 1 as compared to specimen 2, primarily due to negligible out of plane rotations. Furthermore, joint shear deformation increased with increase in eccentricity. However, it was negligible due to slab contribution as well as bond slippage with minimum load transfer to the joint core. It is concluded that bond slippage is the principal failure pattern whereas out of plan rotation increases with eccentricity without significant contribution to the final failure pattern.
Doi: 10.28991/cej-2021-03091650
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References
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, 37 pp (2002).
Shin, Myoungsu, and James M. LaFave. "Seismic performance of reinforced concrete eccentric beam-column connections with floor slabs." Structural Journal 101, no. 3 (2004): 403-412.
Xing, G.H., T. Wu, D.T. Niu, and X. Liu. “Seismic Behavior of Reinforced Concrete Interior Beam-Column Joints with Beams of Different Depths.” Earthquakes and Structures 4, no. 4 (April 25, 2013): 429–449. doi:10.12989/eas.2013.4.4.429.
Raffaelle, Gregory S. "R/C eccentric beam-column connections subjected to earthquake-type loading." (1993): 5874-5874.
Vollum, R. L., and J. B. Newman. “Towards the Design of Reinforced Concrete Eccentric Beam—column Joints.” Magazine of Concrete Research 51, no. 6 (December 1999): 397–407. doi:10.1680/macr.1999.51.6.397.
Hung-Jen, Lee, and Ko Jen-Wen. "Eccentric reinforced concrete beam-column connections subjected to cyclic loading in principal directions." ACI Structural Journal 104, no. 4 (2007): 459.
Goto, Yasuaki, and Osamu Joh. "Shear resistance of RC interior eccentric beam-column joints." In 13th World Conference on Earthquake Engineering, (2004): 1-6.
Li, Bing, Tso-Chien Pan, and Cao Thanh Tran. “Effects of Axial Compression Load and Eccentricity on Seismic Behavior of Nonseismically Detailed Interior Beam-Wide Column Joints.” Journal of Structural Engineering 135, no. 7 (July 2009): 774–784. doi:10.1061/(asce)0733-9445(2009)135:7(774).
Behnam, Hamdolah, J.S. Kuang, and Roy Y.C. Huang. “Exterior RC Wide Beam-Column Connections: Effect of Beam Width Ratio on Seismic Behaviour.” Engineering Structures 147 (September 2017): 27–44. doi:10.1016/j.engstruct.2017.05.044.
Di Franco, Marco A., Denis Mitchell, and Patrick Paultre. “Role of Spandrel Beams on Response of Slab-Beam-Column Connections.” Journal of Structural Engineering 121, no. 3 (March 1995): 408–419. doi:10.1061/(asce)0733-9445(1995)121:3(408).
Kim, Jaehong, and James M. LaFave. “Key Influence Parameters for the Joint Shear Behaviour of Reinforced Concrete (RC) Beam–column Connections.” Engineering Structures 29, no. 10 (October 2007): 2523–2539. doi:10.1016/j.engstruct.2006.12.012.
Joh, O., Y. Goto, and T. Shibata. "Behavior of reinforced concrete beam-column joints with eccentricity." Special Publication 123 (1991): 317-358.
Canbolat, Burcu B., and James K. Wight. "Experimental investigation on seismic behavior of eccentric reinforced concrete beam-column-slab connections." ACI Structural Journal 105, no. 2 (2008): 154.
ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-14)” American Concrete Institute, Farmington Hills, MI, (2014): 519.
Lee, Hung-Jen, and Si-Ying Yu. "Cyclic response of exterior beam-column joints with different anchorage methods." ACI Structural Journal 106, no. 3 (2009): 329.
Ma, Cailong, Zhenyu Wang, and Scott T. Smith. “Seismic Performance of Large-Scale RC Eccentric Corner Beam-Column-Slab Joints Strengthened with CFRP Systems.” Journal of Composites for Construction 24, no. 2 (April 2020): 04019066. doi:10.1061/(asce)cc.1943-5614.0000995.
Wong, Ho-Fai, Ying Liu, Sung-Hei Luk, Pok-Man Lee, and Wing-Hei Kwong. "Effects of eccentricity on seismic behavior of non-seismically designed reinforced concrete beam-column joint." (2019).
Mogili, Srinivas, J. S. Kuang, and Roy Y. C. Huang. “Effects of Beam–column Geometry and Eccentricity on Seismic Behaviour of RC Beam–column Knee Joints.” Bulletin of Earthquake Engineering 17, no. 5 (January 17, 2019): 2671–2686. doi:10.1007/s10518-019-00562-y.
DOI: 10.28991/cej-2021-03091650
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