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http://dx.doi.org/10.12989/scs.2015.18.5.1083

Shear strength analyses of internal diaphragm connections to CFT columns  

Kang, Liping (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University)
Leon, Roberto T. (Via Department of Civil and Environmental Engineering, Virginia Tech)
Lu, Xilin (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University)
Publication Information
Steel and Composite Structures / v.18, no.5, 2015 , pp. 1083-1101 More about this Journal
Abstract
Previous theoretical equations for the shear capacity of steel beam to concrete filled steel tube (CFT) column connections vary in the assumptions for the shear deformation mechanisms and adopt different equations for calculating shear strength of each component (steel tube webs, steel tube flanges, diaphragms, and concrete etc.); thus result in different equations for calculating shear strength of the joint. Besides, shear force-deformation relations of the joint, needed for estimating building drift, are not well developed at the present. This paper compares previously proposed equations for joint shear capacity, discusses the shear deformation mechanism of the joint, and suggests recommendations for obtaining more accurate predictions. Finite element analyses of internal diaphragm connections to CFT columns were carried out in ABAQUS. ABAQUS results and theoretical estimations of the shear capacities were then used to calibrate rotational springs in joint elements in OpenSEES simulating the shear deformation behavior of the joint. The ABAQUS and OpenSEES results were validated with experimental results available. Results show that: (1) shear deformation of the steel tube dominates the deformation of the joint; while the thickness of the diaphragms has a negligible effect; (2) in OpenSEES simulation, the joint behavior is highly dependent on the yielding strength given to the rotational spring; and (3) axial force ratio has a significant effect on the joint deformation of the specimen analyzed. Finally, modified joint shear force-deformation relations are proposed based on previous theory.
Keywords
joint behavior; CFT columns; shear capacity; shear deformation mechanism; finite element analysis; shear force-deformation relations;
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1 Ibarra, L.F., Medina, R.A. and Krawinkler, H. (2005), "Hysteretic models that incorporate strength and stiffness deterioration", Earthq. Eng. Struct. Dyn., 34(11), 1489-1511.   DOI
2 Latour, M., Piluso, V. and Rizzano, G. (2011), "Cyclic modeling of bolted beam-to-column connections: Component approach", J. Earthq. Eng., 15(4), 537-563.   DOI
3 Lowes, L.N. and Altoontash, A. (2003), "Modeling reinforced-concrete beam-column joints subjected to cyclic loading", J. Struct. Eng., 129(12), 1686-1697.   DOI
4 Lu, X.L., Yong, Y., Kiyoshi, T. and Satoshi, S. (2000), "Experimental study on the seismic behavior in the connection between CFRT column and steel beam", Struct. Eng. Mech., Int. J., 9(4), 365-374.   DOI   ScienceOn
5 Mazzoni, S., McKenna, F., Scott, M.H., Fenves, G.L. et al. (2007), OpenSEES Command Language Manual, Department of Civil Environmental Engineering, University of California, Berkley, CA, USA.
6 Morino, S., Kawaguchi, J., Yasuzaki, C. and Kanazawa, S. (1993), "Behavior of concrete-filled steel tubular three-dimensional subassemblages", Proceedings of an Engineering Foundation Conference, ASCE, Potosi, MO, June, pp. 726-741.
7 Morino, S. and Tsuda, K. (2003), "Design and conctruction of concrete-filled steel tube column system in Japan", Earthq. Eng. Eng. Seismol., 4(1), 51-73.
8 Nie, J.G. and Qin, K. (2007), "Research on shear performance of concrete-filled square steel tubular column connections", J. Build. Struct., 28(4), 8-17. [In Chinese]
9 Ricles, J.M., Peng, S.M. and Lu, L.W. (2004), "Seismic behavior of composite concrete filled steel tube column-wide flange beam moment connections", J. Struct. Eng., 130(2), 223-232.   DOI   ScienceOn
10 Wang, L., Wang, T. and Deng, P. (2005), "Experimental research on seismic performance of joint reinforced with inner ring stiffener of concrete-filled square tubular frame", Earthq. Eng. Eng. Vib., 25(1), 76-80.
11 Wu, L.-Y., Chung, L.-L., Tsai, S.-F., Lu, C.-F. and Huang, G.-L. (2007), "Seismic behavior of bidirectional bolted connections for CFT columns and H-beams", Eng. Struct., 29(3), 395-407.   DOI
12 Youssef, N.F.G., Bonowitz, D. and Gross, J.L. (1995), "A survey of steel moment-resisting frame buildings affected by the 1994 Northridge earthquake", National Institute of Standards and Technology; US Department of Commerce.
13 Zhou, T.H. (2004), "Study on seismic behavior and load-carrying capacity of concrete-filled suqre tubular column to steel beam connection", Xi'an University of Architecture and Technology, Xi'an, China. [In Chinese]
14 DSSC (2010), Abaqus 6.10 Analysis User's Manual, Dassault Systems Simulia Corp., Providence, RI, USA.
15 AIJ (1991), Standard for Structural Calculation of Steel Reinforced Concrete Structures, Architectural Institute of Japan.
16 AISC (2010), Seismic Provisions for Structural Steel Buildings, AISC, Chicago, IL, USA.
17 CECS (2004), Technical Specification for Structures with Concrete-filled Rectangular Steel Tube Members, China Engineering Construction Standardization Association, Beijing, China. [In Chinese]
18 Elremaily, A. and Azizinamini, A. (2001), "Design provisions for connections between steel beams and concrete filled tube columns", J. Construct. Steel Res., 57(9), 971-996.   DOI   ScienceOn
19 Fukumoto, T. and Morita, K. (2005), "Elastoplastic behavior of panel zone in steel beam-to-concrete filled steel tube column moment connections", J. Struct. Eng., 131(12), 1841-1853.   DOI
20 Fukumoto, T. and Morita, K. (2005), "Elastoplastic behavior of panel zone in steel bean-to-concrete filled steel tube column moment connections", J. Struct. Eng., 131(12), 1841-1853.   DOI
21 Han, L.H. (2004), Concrete Filled Steel Tube Structures-Theory and Practice, Science Press of China, Beijing, China. [In Chinese]
22 Hu, J.W. (2008), "Seismic performance evaluations and analyses for composite moment frames with smart SMA PR-CFT connections", Ph.D. Thesis; Georgia Institute of Technology, Atlanta, GA, USA.