Vol. 11, No. 1, pp. 95-110 (2015)
PRACTICAL ADVANCED ANALYSIS FOR
ECCENTRICALLY BRACED FRAMES
Shujun Hu 1 and Zhan Wang 2,*
1 School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China
2 State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China)
*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 19 March 2014; Revised: 23 April 2014; Accepted: 5 May 2014
DOI:10.18057/IJASC.2015.11.1.6
![]() |
Export Citation: Plain Text | RIS | Endnote |
ABSTRACT
Under severe earthquakes, flexural or shear yielding of the inelastic links in eccentrically braced frames (EBFs) was often observed. The behavior of links could not be well predicted by the traditional advanced analysis method when they experienced shear yielding and strain hardening. In this paper, the analytical model of links is obtained by using three rotational subsprings and three translational subsprings with zero-length, respectively, at each element end to simulate the flexural and shear yielding behavior with strain hardening effect. For the other elements in EBFs, a spring with zero-length is provided at each end to consider yielding on the cross-sectional level. The yield functions for the links and other elements are derived based on the section assemblage concept, and a practical advanced analysis method for EBFs is proposed. The proposed elements have the same nodal degree of freedom as conventional element by condensing the non-nodal degree of freedom that introduced in the derivation. Numerical analysis shows that the proposed method has a high efficiency and accuracy as well as easy determination of the element yielding sequence.
KEYWORDS
Eccentrically braced frames (EBFs), Advanced analysis, Shear link, Section assemblage concept, Yield function, Strain hardening
REFERENCES
[1] Kasai, K. and Popov, E.P., “General Behavior of WF Steel Shear Link Beams”, Journal of Structural Engineering, ASCE, 1986, Vol.112, No.2, pp. 362-382.
[2] Kasai, K. and Popov, E.P., “Cyclic Web Buckling Control of Shear Link Beams”, Journal of Structural Engineering, ASCE, 1986, Vol. 112, No. 3, pp. 505-523.
[3] Prpov, E.P. and Engelhardt, M.D., “Seismic Eccentrically Braced Frames”, Journal of Constructional Steel Research, 1988, Vol. 10, pp. 321-354.
[4] Okazaki, T. and Engelhardt, M.D., “Cyclic Loading Behavior of EBF Links Constructed of ASTM A992 Steel”, Journal of Constructional Steel Research, 2007, Vol. 63, No. 6, pp. 751-765.
[5] Daneshmand, A. and Hosseini, B., “Performance of Intermediate and Long Links in Eccentrically Braced Frames”. Journal of Constructional Steel Research, 2012, Vol. 70, pp. 167-176.
[6] Ricles, J.M. and Popov, E.P., “Inelastic Link Element for EBF Seismic Analysis”, Journal of Structural Engineering, ASCE, 1994, Vol. 120, No. 2, pp. 441-463.
[7] Ramadan, T. and Ghobarah, A., “Analytical Model for Shear-link Behavior”, Journal of Structural Engineering, ASCE, 1995, Vol. 121, No.11, pp. 1574-1580.
[8] Richards, P.W. and Uang, C.M., “Testing Protocol for Short Links in Eccentrically Braced Frames”, Journal of Structural Engineering, ASCE, 2006, Vol. 132, No. 8, pp. 1183-1191.
[9] Liew, J.Y.R., White, D.W. and Chen, W. F., “Second-order Refined Plastic Hinge Analysis of Frame Design, Part 1”, Journal of Structural Engineering, ASCE, 1993, Vol. 119, No. 11, pp. 3196-3216.
[10] Kim, S.E. and Chen, W.F., “Practical Advanced Analysis for Braced Steel Frames Design”, Journal of Structural Engineering, ASCE, 1996, Vol.122, No.11, pp. 1266-1274.
[11] Chen, W.F., “Structural Stability: from Theory to Practice”, Engineering Structures, 2000, Vol. 22, No. 2, pp. 116-122.
[12] Chan, S.L. and Chui, P.P.T., “A Generalized Design-based Elastoplastic Analysis of Steel Frames by Section Assemblage Concept”, Engineering Structures, 1997, Vol. 19, No. 8, pp. 628-636.
[13] Chen, W.F. and Lui, E.M., “Stability Design of Steel Frames”, CRC Press, 1992.
[14] Chan, S.L. and Chui, P.P.T., “Non-linear Static and Cyclic Analysis of Semi-rigid Steel Frames”, Elsevier Science, 2000.
[15] European Convention for Constructional Steelwork, “Ultimate Limit State Calculation of Sway Frames with Rigid Joints, ECCS”, Technical Working Group 8.2, Systems, Publication No. 33, 1983.
[16] Ghobarah, A. and Ramadan, T., “Effect of Axial Forces on the Performance of Links in Eccentrically Braced Frames”, Engineering Structures, 1990, Vol. 12, No. 2, pp. 106-113.
[17] Shi, Y.J., Xiong, J. and Wang, Y.Q., “Experimental Studies on Seismic Performance of Multi-storey Steel Frame with Eccentric Brace”, Journal of Building Structures, 2010, Vol. 31, No. 2, pp. 29-34.
[18] Code for Seismic Design of Buildings, GB50010-2010, Beijing, China Architecture & Building Press, 2010.
[19] Rozon, J., Koboevic, S. and Tremblay, R., “Study of Global Behavior of Eccentrically Braced Frames in Response to Seismic Loads”, The 14th World Conference on Earthquake Engineering, Beijing, 2008.