Designing Eccentrically Braced Steel Frames with Different Link Lengths along the Frame Height

Abstract eng:
At present, inelastic static pushover analysis is widely used in engineering practice to predict seismic capacity of building structures because of its simplicity compared to the inelastic dynamic analysis. In this paper, the maximum displacements of 9 eccentrically braced steel frames with various geometries are obtained with inelastic static pushover analyses based on FEMA-356 load patterns. Model frames are designed according to LRFD (1999) and the capacity based design principles are based on AISC-Seismic Provisions for Structural Steel Buildings (2005). Loads and load combinations are compatible with ASCE 7-05. Inelastic dynamic analyses of these frames are also conducted under 20 SAC ground motions. Both static and dynamic inelastic analyses are carried out with the DRAIN-2DX program. During inelastic dynamic analyses each earthquake record for each frame is scaled by a coded program by modifying the DRAIN input files in an automated manner until the frames reach their limit states and the resultant scaled earthquake records are used for obtaining the frames’ maximum displacements. The maximum displacements obtained by these methods are utilized in order to assess the validity of the pushover analyses.

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