Reduced Beam Section (RBS) Moment Connections-Analytical Investigation Using Finite Element Method
Reduced Beam Section (RBS) moment resisting connections are among the most economical and practical rigid steel connections developed in the aftermath of the 1994 Northridge and the 1995 Kobe earthquakes. Although the RBS connection effectiveness was widely investigated using US design and construction practices, only limited data exist from European research. Recommendations of RBS applications in steel frames were prescribed in EC8, Part3. However the reliability of these recommendations is under consideration due to above mentioned poor existing data. This paper examines numerous different contours of radius cut-out (Group A) and provides recommendations for the design and detailing of radius cut Reduced Beam Section (RBS) moment connections. Furthermore, it examines and compares different beam cross sections of European steel profiles (Group B) while the sizing of the RBS cut is kept at a constant ratio. Analytical approach was conducted investigating the adopted by EC8, Part 3 key parameters for the design. The main objective of the applied RBS geometry is to protect the connection and its components (endplate, column flange, bolts, welds) from either plastification or failure. Although the computational cost for optimization with ABAQUS is very large, the results of this study ensures on one hand that the performances of the structural parts can be effectively improved by shape optimization and an the other hand that adjustment in the geometry of the radius cut is needed for safe application to European profiles.
Plumier A. Behaviour of connections. J. Construct. Steel Research 1994; 29: 95-119. https://doi.org/10.1016/0143-974x(94)90058-2.
Chen SJ, Chu JM, Chou ZL. Dynamic behavior of steel frames with beam flanges shaved around connection. J. Construct. Steel Research 1997; 42 (1): 49-70. https://doi.org/10.1016/s0143-974x(97)00011-4.
Engelhardt MD, Sabol TA. Seismic-resistant steel moment connections: developments since the 1994 Northridge earthquake. In: Zandonini R, Elnashai A, Dexter R, Editors. Progress in structural engineering and materials; 1997; 1(1): 68-77. https://doi.org/10.1002/pse.2260010112.
Popov E, Blondet M, Stepanov L. Application of dog bones for improvement of seismic behavior of steel connections. Report No UCB/EERC 96/05 1996, U.S.A.
FEMA 350. Recommended seismic design criteria for new steel moment-frame buildings. Washington D.C., 2000.
FEMA 351. Recommended seismic evaluation and upgrade criteria for existing welded steel moment frame buildings. Washington D.C., 2000.
EC 8, Part 3: Design of structures for earthquake resistance. Assessment and retrofitting of buildings. EN 1998-3: June 2005E.
Adan SM, Reaveley LD. The reduced beam section moment connection without continuity plates. In: Proc. Of 13th World Conference on Earthquake Engineering (13 WCCE), Vancouver, Canada; 2004.
Deylamy A, Moslehi Tabar A. Experimental study on the key issues affecting cyclic behaviour of reduced beam section moment connections. In: Proc. Of 14th World Conference on Earthquake Engineering (14 WCCE), Beijing, China; 2008.
Moon K-H, Kim B-Ch, Hwang S-H, Han SW. Seismic performance evaluation of the steel moment frames with reduced beam section connections with bolted webs. In: Proc. of 5th International Symposium on Steel Structures, Seoul, Korea; 2009.
Lignos D, Kolios D, Miranda E. Fragility assessment of reduced beam section moment connections. J Struct Eng 2010;136(9):1140–50. https://doi.org/10.1061/(asce)st.1943-541x.0000214.
Tsavdaridis, K. D., Faghih, F., and Nikitas, N. Assessment of perforated steel beam-to-column connections subjected to cyclic loading. J. Earthq. Eng. 2014; 18, 1302–1325. https://doi.org/10.1080/13632469.2014.935834.
Brunesi E., Nascimbene R., Rassati G.A. Seismic response of MRFs with partially-restrained bolted beam-to-column connections through FE analyses. J. of Contructural Steel Research 2015; 107: 37-49. https://doi.org/10.1016/j.jcsr.2014.12.022.
Sofias, C. E., Kalfas, C. N., and Pachoumis, D. T. Experimental and FEM analysis of reduced beam section endplate connections under cyclic loading. J. Engineering Structures 2014; 59: 320–329. https://doi.org/10.1016/j.engstruct.2013.11.010.
Pachoumis DT, Galousis EG, Kalfas CN, Efthimiou IZ. Cyclic performance of steel moment-resisting connections-experimental analysis and finite element model simulation, J. Engineering Structures 2010; 32: 2683-2692. ttps://doi.org/10.1016/j.engstruct.2010.04.038.
Naughton D.T., Tsavdaridis, K.D. Maraveas C., Nicolaou A., Pushover Analysis of Steel Seismic Resistant Frames with Reduced Web Section and Reduced Beam Section Connections. Frontiers in Built Environment, Vol. 3, Oct. 2017. https://doi.org/10.3389/fbuil.2017.00059.
ABAQUS/PRE. Users manual. Hibbit, Karlsson and Sorensen Inc., 1997.
- There are currently no refbacks.
Copyright (c) 2018 Christos Sofias
This work is licensed under a Creative Commons Attribution 4.0 International License.