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http://dx.doi.org/10.12989/eas.2016.10.2.367

Fragility functions for eccentrically braced steel frame structures  

O'Reilly, Gerard J. (ROSE Programme, UME School)
Sullivan, Timothy J. (Department of Civil Engineering and Architecture, University of Pavia)
Publication Information
Earthquakes and Structures / v.10, no.2, 2016 , pp. 367-388 More about this Journal
Abstract
Eccentrically braced frames (EBFs) represent an attractive lateral load resisting steel system to be used in areas of high seismicity. In order to assess the likely damage for a given intensity of ground shaking, fragility functions can be used to identify the probability of exceeding a certain damage limit-state, given a certain response of a structure. This paper focuses on developing a set of fragility functions for EBF structures, considering that damage can be directly linked to the interstorey drift demand at each storey. This is done by performing a Monte Carlo Simulation of an analytical expression for the drift capacity of an EBF, where each term of the expression relies on either experimental testing results or mechanics-based reasoning. The analysis provides a set of fragility functions that can be used for three damage limit-states: concrete slab repair, damage requiring heat straightening of the link and damage requiring link replacement. Depending on the level of detail known about the EBF structure, in terms of its link section size, link length and storey number within a structure, the resulting fragility function can be refined and its associated dispersion reduced. This is done by using an analytical expression to estimate the median value of interstorey drift, which can be used in conjunction with an informed assumption of dispersion, or alternatively by using a MATLAB based tool that calculates the median and dispersion for each damage limit-state for a given set of user specified inputs about the EBF. However, a set of general fragility functions is also provided to enable quick assessment of the seismic performance of EBF structures at a regional scale.
Keywords
eccentrically-braced frame; fragility functions; steel; performance-based design; seismic assessment;
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  • Reference
1 AISC 341-10 (2010), "Seismic provisions for structural steel buildings", AISC 341-10. Chicago, Illinois, USA.
2 Ang, A. and Tang, W. (2007), Probability Concepts in Engineering, Emphasis on Applications in Civil and Environmental Engineering, John Wiley & Sons, Ltd.
3 Arce, G. (2002), "Impact of higher strength steels on local buckling and overstrength of links in eccentrically braced frames", MSc Thesis, The University of Texas at Austin.
4 Braconi, A., Badalassi, M. and Salvatore, W. (2010), "Modeling of European steel qualities mechanical properties scattering and its influence on Eurocode 8 design requirements", 14ECEE - European Conference on Earthquake Engineering, Vol. 1998, Ohrid, Macedonia.
5 Clifton, C., Bruneau, M., MacRae, G.A., Leon, R. and Fussell, A. (2011), "Steel structures damage from the christchurch earthquake series of 2010 and 2011", Bull. NZ. Soc. Earthq. Eng., 44(4), 297-318.
6 Corus (2006), "Structural Sections to BS4: Part 1: 1993 and BS EN10056: 1999", North Lincolnshire, UK.
7 CSA S16-09 (2009), Design Of Steel Structures, CSA S16-09. Vol. 8523. Ontario, Canada.
8 Della Corte, G., D'Aniello, M. and Landolfo, R. (2013), "Analytical and numerical study of plastic overstrength of shear links", J. Constr. Steel Res., 82, 19-32.   DOI
9 EN 1993-1-1:2005 (2005), Eurocode 3: Design of Steel Structures-Part 1-1: General Rules and Rules for Buildings, EN 1993-1-1:2005. Brussels, Belgium.
10 EN 1998-1:2004 (2004), Eurocode 8: Design of Structures for Earthquake Resistance-Part 1: General Rules, Seismic Actions and Rules for Buildings, Comite Europeen de Normalisation. Brussels, Belgium.
11 Engelhardt, M.D. and Popov, E.P. (1989), Behavior of Long Links in Eccentrically Braced Frames, Research Report UCB/EERC-89/01, Berkeley, California.
12 FEMA P58-1 (2012), Seismic Performance Assessment of Buildings: Volume 1-Methodology (P-58-1), Vol. 1, Washington, DC.
13 FEMA P58-2 (2012), Seismic Performance Assessment of Buildings: Volume 2-Implementation Guide (P-58-2), Vol. 2. Washington, DC.
14 Galvez, P. (2004), "Investigation of factors affecting web fractures in shear links", MSc Thesis, The University of Texas at Austin.
15 Gulec, C.K., Gibbons, B., Chen, A. and Whittaker, A.S. (2011), "Damage states and fragility functions for link beams in eccentrically braced frames", J. Constr. Steel Res., 67(9), 1299-1309.   DOI
16 Kusyilmaz, Ahmet and Topkaya, Cem (2015), "Displacement amplification factors for steel eccentrically braced frames", Earthq. Eng. Struct. Dyn., 44(2), 167-184.   DOI
17 Mansour, N. (2010), "Development of the design of eccentrically braced frames with replaceable shear links", Ph.D. Thesis, Department of Civil Engineering, University of Toronto.
18 MATLAB (2014), Version 8.3.0 (R2014a), Natick, Massachusetts: The Mathworks Inc.
19 Mazzolani, F.M., Landolfo, R., Della Corte, G. and Faggiano, B. (2006), Edifici Con Struttura Di Acciaio in Zona Sismica, IUSS Press, Pavia, Italy. (in Italian)
20 McKenna, F., Fenves, G., Filippou, F.C. and Mazzoni, S. (2000), Open System for Earthquake Engineering Simulation (OpenSees), http://opensees.berkeley.edu/wiki/index.php/Main_Page.
21 NZS 3404 (2007), Steel Structures Standard, NZS 3404:Part 1:1997, Wellington, New Zealand.
22 O'Reilly, Gerard J. and Timothy, J. Sullivan (2015), "Direct displacement-based seismic design of eccentrically braced steel frames", J. Earthq. Eng., doi:10.1080/13632469.2015.1061465.   DOI
23 Okazaki, T., Arce, G., Ryu, H.C. and Engelhardt, M.D. (2005), "Experimental study of local buckling, overstrength, and fracture of links in eccentrically braced frames", J. Struct. Eng., 131(10), 1526-1535.   DOI
24 Okazaki, T. and Engelhardt, M.D. (2007), "Cyclic loading behavior of EBF links constructed of ASTM A992 steel", J. Constr. Steel Res., 63(6), 751-765.   DOI
25 Okazaki, T., Engelhardt, M.D., Drolias, A., Schell, E., Hong, J.K. and Uang, C.M. (2009), "Experimental investigation of Link-to-Column connections in eccentrically braced frames", J. Constr. Steel Res., 65(7), 1401-1412.   DOI
26 Porter, K.A. (2003), "An overview of PEER's performance-based earthquake engineering methodology", Proceedings of Ninth International Conference on Applications of Probability and Statistics in Engineering, Vol. 8, San Francisco, CA, USA.
27 Porter, K.A., Beck, J.L. and Shaikhutdinov, R.V. (2004), "Simplified estimation of economic seismic risk for buildings", Earthq. Spectra, 20(4), 1239-1263.   DOI
28 Richards, P.W. and Uang, C.M. (2006), "Testing protocol for short links in eccentrically braced frames", J. Struct. Eng., 132(8), 1183-1191.   DOI
29 Ryu, H.C. (2005), "Effects of loading history on the behavior of links in seismic-resistant eccentrically braced Frames", MSc Thesis, The University of Texas at Austin.
30 Rossi, P.P. and Lombardo, A. (2007), "Influence of the link overstrength factor on the seismic behaviour of eccentrically braced frames", J. Constr. Steel Res., 63(11), 1529-1545.   DOI
31 Sullivan, T.J. (2013), "Direct displacement-based seismic design of steel eccentrically braced frame structures", Bull. Earthq. Eng., 11(6), 2197-2231.   DOI
32 Uriz, P. and Mahin, S.A. (2008), "Toward earthquake-resistant design of concentrically braced steel-frame structures", PEER Report No. 2008/08, Berkeley, California, USA.
33 Welch, D.P., Sullivan, T.J. and Calvi, G.M. (2014), "Developing direct displacement-based procedures for simplified loss assessment in performance-based earthquake engineering", J. Earthq. Eng., 18(2), 290-322.   DOI