Seismic behavior of code-designed steel moment resisting concentrically braced frames (MRCBFs) in so
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Results related to the assessment of force modification factors obtained with pushover analyses of 13 regular steel buildings structured with ductile moment – resisting concentrically braced frames are summarized in this paper. Four-story to 16-story models were designed for the soft soil condition according with Mexico’s Federal District Code (MFDC-04). Different balances between the story shear resisted by the columns with respect to the one resisted by the bracing system were considered. Improved equations are proposed for a more realistic assessment of ductilityand overstrengthforce modification factors.
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