Advanced Steel Construction

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

 

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

 

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