Study of Global Behaviour of Eccentrically Braced Frames in Response to Seismic Loads

Abstract eng:
An initial phase of the on-going research project investigating a global seismic response of eccentrically braced frames (EBFs) is presented. The project includes both analytical and large-scale experimental studies. The following objectives are set for the analytical study: (i) determine the most appropriate analytical models to represent seismic behaviour of all frame members; (ii) verify if the current design procedures achieve desired frame response; and (iii) evaluate the impact of the element behaviour non-anticipated in design on global frame performance. This paper describes the work related to objectives (i) and (ii). Two dimensional non-linear timehistory analyses were conducted for three-storey chevron-type EBFs designed for typical western and eastern North-American seismic conditions. Special attention was given to the selection of earthquake records and the calibration procedures. Results demonstrate that different analytical models give similar results in terms of maximal element forces but exhibit much higher variability regarding inelastic deformations both at element and global structural level. This may be significant when estimates of inelastic structural deformations are used as the key parameter in design. Preliminary findings also indicate that limited yielding of beams and braces does not seem to have a negative impact on the overall frame performance.

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