- Volume 18 Issue 5
DOI QR Code
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)
- Received : 2013.08.31
- Accepted : 2014.11.07
- Published : 2015.05.25
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.
- AIJ (1991), Standard for Structural Calculation of Steel Reinforced Concrete Structures, Architectural Institute of Japan.
- AISC (2010), Seismic Provisions for Structural Steel Buildings, AISC, Chicago, IL, USA.
- CECS (2004), Technical Specification for Structures with Concrete-filled Rectangular Steel Tube Members, China Engineering Construction Standardization Association, Beijing, China. [In Chinese]
- DSSC (2010), Abaqus 6.10 Analysis User's Manual, Dassault Systems Simulia Corp., Providence, RI, USA.
- 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. https://doi.org/10.1016/S0143-974X(01)00016-5
- 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. https://doi.org/10.1061/(ASCE)0733-9445(2005)131:12(1841)
- 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. https://doi.org/10.1061/(ASCE)0733-9445(2005)131:12(1841)
- Han, L.H. (2004), Concrete Filled Steel Tube Structures-Theory and Practice, Science Press of China, Beijing, China. [In Chinese]
- 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.
- 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. https://doi.org/10.1002/eqe.495
- 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. https://doi.org/10.1080/13632469.2010.513423
- Lowes, L.N. and Altoontash, A. (2003), "Modeling reinforced-concrete beam-column joints subjected to cyclic loading", J. Struct. Eng., 129(12), 1686-1697. https://doi.org/10.1061/(ASCE)0733-9445(2003)129:12(1686)
- 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. https://doi.org/10.12989/sem.2000.9.4.365
- 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.
- 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.
- 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.
- 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]
- 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. https://doi.org/10.1061/(ASCE)0733-9445(2004)130:2(223)
- 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.
- 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. https://doi.org/10.1016/j.engstruct.2006.05.007
- 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.
- 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]
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- Flexural strength of circular concrete-filled tubes vol.1, pp.4, 2016, https://doi.org/10.12989/acd.2016.1.4.297
- Numerical study on the performance of beam-to-concrete-filled steel tube column joint with adapter-bracket 2017, https://doi.org/10.1177/1369433217746345
- A parametric investigation on the hysteretic behaviour of CFT column to steel beam connections vol.55, pp.1, 2015, https://doi.org/10.12989/sem.2015.55.1.205
- Experimental study discussion of the seismic behavior on new types of internal/external stiffeners in rigid beam-to-CFST/HSS column connections vol.136, 2017, https://doi.org/10.1016/j.conbuildmat.2017.01.032
- Shear behaviour of panel zone in through-diaphragm connections to steel tubular columns vol.122, 2018, https://doi.org/10.1016/j.tws.2017.10.029
- An Analytical Study of Square CFT Columns in Bracing Connection Subjected to Axial Loading vol.2018, pp.1687-8094, 2018, https://doi.org/10.1155/2018/8618937
- Experimental and Numerical Investigation of Concrete-Filled Double-Skin Steel Tubular Column for Steel Beam Joints vol.2018, pp.1687-8442, 2018, https://doi.org/10.1155/2018/6514025
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