Behavior Factor of Dual Systems with BRBs and Semi-Rigid Connections

Abstract:

The use of BRBs into a typical European building with braced structure, whereby all the beam-to-column connections are perfectly pinned, may be low effective. In fact, these structures are low-redundant and prone to develop soft story collapse mechanisms. The concentration of drift demand in few stories precludes the full exploitation of the deformation capacity of all the BRBs inserted into the frame, and it partially reduces the benefit they can provide. A more effective structural system may be obtained by coupling frames with BRBs with frames with semi-rigid connections. This paper proposes a design procedure for this dual system and presents the calibration of the behavior factor. To this end, a set of frames is designed considering several values of behavior factor and the response of the obtained frames is determined by nonlinear dynamic analysis. Hence, the behavior factor that allows the frames to meet the performance objective requirement of EuroCode 8 is determined.

• Periodical: Key Engineering Materials (Volume 763)
• Pages: 949-956
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.763.949
• Online since: February 2018
• Authors: Francesca Barbagallo, Melina Bosco, Edoardo Michele Marino*, Pier Paolo Rossi
• Keywords: Concentrically Braced Frames, Dual System, Seismic Response, Semi-Rigid Connections

References

[1] R. Tremblay, Inelastic seismic response of steel bracing members. Journal of Constructional Steel Research, 58 (2002) 665-701.

DOI: 10.1016/s0143-974x(01)00104-3

[2] G. Della Corte, M. D'Aniello, R. Landolfo, F.M. Mazzolani, Review of steel buckling-restrained braces, Steel Construction. 4 (2011) 85-93.

DOI: 10.1002/stco.201110012

[3] Q. Xie, State of the art of buckling-restrained braces in Asia, Journal of Constructional Steel Research. 61 (2005) 727-748.

DOI: 10.1016/j.jcsr.2004.11.005

[4] K. Deng, P. Pan, X. Nie, X. Xu, P. Feng, L. Ye, Study of GFRP Steel Buckling Restraint Braces, Journal of Composites for Construction. 19 (2015).

DOI: 10.1061/(asce)cc.1943-5614.0000567

[5] K.L. Deng, P. Pan, W. Li, Y.T. Xue, Development of a buckling restrained shear panel damper, Journal of Constructional Steel Research. 106 (2015) 311-321.

DOI: 10.1016/j.jcsr.2015.01.004

[6] P.C. Lin, K.C. Tsai, C.A. Chang, Y.Y. Hsiao, A.C. Wu, Seismic design and testing of buckling-restrained braces with a thin profile, Earthquake Engineering and Structural Dynamics. 45 (2016) 339-358.

DOI: 10.1002/eqe.2660

[7] F. Barbagallo, M. Bosco, A. Ghersi, E.M. Marino, P.P. Rossi, Effects of semi-rigid connections on seismic performance of steel frames with BRBs, XXVI Congresso C.T.A., 28-30 September 2017, Venice, Italy.

DOI: 10.1016/j.jcsr.2019.03.030

[8] CEN. EuroCode 8: Design of structures for earthquake resistance – Part 1: General rules, seismic actions and rules for buildings, EN 1998-1. European Committee for Standardization, Bruxelles; (2004).

DOI: 10.3403/03244372u

[9] CEN. EuroCode 8: Design of structures for earthquake resistance – Part 3: Assessment and retrofitting of buildings, EN 1998-3. European Committee for Standardisation, Bruxelles; (2005).

[10] A. Longo, R. Montuori, V. Piluso, Plastic design of seismic resistant V-braced frames. Journal of Earthquake Engineering, 12 (2008) 1246-1266.

DOI: 10.1080/13632460802211867

[11] E.M. Marino, A unified approach for the design of high ductility steel frames with concentric braces in the framework of Eurocode 8, Earthquake Engineering and Structural Dynamics. 43 (2014) 97-18.

DOI: 10.1002/eqe.2334

[12] M. Bosco, E.M. Marino, P.P. Rossi, Design of steel frames equipped with BRBs in the framework of Eurocode 8, Journal of Constructional Steel Research 113 (2015) 43-57.

DOI: 10.1016/j.jcsr.2015.05.016

[13] CEN. EuroCode 3: Design of steel structures – Part 1-1: General rules and rules for buildings, EN 1993-1-1. European Committee for Standardisation, Bruxelles, (2003).

[14] S. Mazzoni, F. McKenna, M.H. Scott, G.L. Fenves et al., OpenSees Command Language Manual. Pacific Earthquake Engineering Research Center, University of California, Berkeley, (2007).

[15] FEMA 356: Prestandard and commentary for the seismic rehabilitation of buildings, Federal Emergency Management Agency, (2000).

[16] P.P. Rossi, Importance of isotropic hardening in the modeling of buckling restrained braces, Journal of Structural Engineering ASCE (2014) http: /dx. doi. org/10. 1061/(ASCE)ST. 1943-541X. 0001031.

DOI: 10.1061/(asce)st.1943-541x.0001031

[17] A. Zona, A. Dall'Asta, Elastoplastic model for steel buckling-restrained braces, Journal of Constructional Research 68 (2012) 118-125.

DOI: 10.1016/j.jcsr.2011.07.017

[18] P. Somerville et al. Development of ground motion time histories for phase 2 of the FEMA/SAC steel project. SAC Background Document. Report No. SAC/BD-99-03, SAC Joint Venture, 555 University Ave., Sacramento, (1997).