Deflection Amplification Factors for Ductile Braced Frames

Abstract eng:
For most seismic braced frames, strength rather than stiffness governs design. Still, it is important for designers to understand braced frame drift and predict inelastic deformations under severe earthquakes. Often in practice, inelastic drifts are estimated by amplifying the elastic drifts that occur under an equivalent lateral force. In current U.S. provisions, displacement amplification factors are about half of the strength reduction factors. Results from time history analyses of 36 braced frames under a suite of 10 earthquakes are used to investigate the accuracy of current methods to estimate inelastic drifts. Buckling restrained braced frames (BRBFs), special concentric braced frames (SCBFs), and eccentrically braced frames (EBFs) are considered. An alternative method of estimating inelastic drifts is investigated where only the shear components of the elastic drift are amplified.

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