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Title

PARAMETRIC ANALYSIS AND OPTIMIZATION OF REDUCED BEAM SECTION STEEL FRAME CONNECTIONS

Authors

Abstract

The RBS connection concept [10] is based on the selective removal of beam material adjacent to the joint either from the web or from the flanges. The reduction in cross-sectional area will reduce the moment capacity at a discrete location of the beam, where yielding will be concentrated, thus protecting the connection from early fracture. After extensive theoretical and experimental work [10] the radius-cut RBS configuration was prequalified in both USA [1,8,9] and Canadian [5] Standards, while its concept was only incorporated in EC8, Part 3 [3] (and not in EC3) for member retrofitting as a mere follow up of the aforementioned Standards without any indication about the type of connection or profiles. The geometry of such a radius-cut RBS is depicted in Fig. 1, while the corresponding size limitations are given in expressions (1), where db is the depth of the beam.

References

[1] FEMA-350, 2000. Recommended Seismic Design Criteria for New Steel Moment-Frame Buildings, Sac Joint Venture, Federal Emergency Management Agency, Washington D.C., USA.
[2] EN 1993-1-1, 2005. Eurocode 3: Design of Steel Structures – Part 1-1: General Rules and rules for buildings, CEN, Brussels, Belgium.
[3] EN 1993-1-08, 2005. Eurocode 3: Design of Steel Structures – Part 1-8: Design of joints, CEN, Brussels, Belgium.
[4] EN 1998-3, 2005. Eurocode 8: Design of structures for earthquake resistance – Part3: Assessment and retrofitting of buildings, CEN, Brussels, Belgium.
[5] Canadian Institute of Steel Construction, 2008. Moment Connections for Seismic Applications, Lakeside Group Inc., Ontario, Canada.
[6] Filiatrault, A., Wanitkorkul, A., Constantinou, M., 2008. Development and Appraisal of a Numerical Cyclic Loading Protocol for Quantifying Building System Performance, Technical Report MCEER-08- 0013, University of Buffalo, USA.
[7] Simões da Silva, L., Rebelo, C., Nethercot, D., Marques, L., Simões, R., Vila Real, P.M.M., 2009. “Statistical Evaluation of the lateral-torsional buckling resistance of steel I-beams, Part 2: Variability of steel properties”. Journal of Constructional Steel Research, ISSN 0143-974X, Elsevier Science Limited, Vol. 65, pp. 832-849.
[8] ANSI/AISC 341-10, 2010. Seismic Provisions of Structural Steel Buildings, American Institute of Steel Construction, Chicago, Illinois, USA.
[9] ANSI/AISC 358-10, 358s1-11, 2011. Prequalified Connections for Special and Intermediate Steel Moment Frames for Seismic Applications, incl. Supplement No 1, American Institute of Steel Construction, Chicago, Illinois, USA.
[10] Sophianopoulos, D.S., Deri, A.E., 2011. “Parameters Affecting Response and Design of Steel Moment Frame Reduced Beam Section Connections: An Overview”. International Journal of Steel Structures, ISSN 1598-2351, Springer Science-Business Media, Vol. 11, pp. 133-144.
[11] Sophianopoulos, D.S., Deri, A.E., 2011. “Steel End-Plate Beam-to-Column RBS Connections: Optimum Design under Monotone Loading Utilizing European I-profiles”. Proc. 6th European Conference on Steel and Composite Structures, 31 August – 2 September, 2011, Budapest, Hungary, ISBN 978-92-9147-013-4, Vol. A, pp. 501-506.
[12] Deri, A.E., 2013. Parametric Analysis and Optimization of Reduced Beam Section Steel Frame Connections, Ph.D. Thesis, Department of Civil Engineering, University of Thessaly, Volos, Greece (in Greek), http://phdtheses.ekt.gr/eadd/handle/10442/28151.
[13] Sofias, C.E., Kalfas, C.N., Pachoumis, D.T., 2014. “Experimental and FEM analysis of reduced beam section moment endplate connections under cyclic loading”. Engineering Structures, ISSN 0141-0296, Elsevier Science Limited, Vol. 59, pp. 320-329.
[14] Mathematica 8, Technical computing software, Wolfram Research, Champaign, Illinois, USA.
[15] Abaqus Ver. 6.8, Users Manuals (10 Volumes), 2008, Dassault Systems, Simulia Corporation.

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