LAUSR

Abstract An assessment of the seismic behaviour of space mixed steel frame systems consisting of buckling restrained braced frames perimetrically and moment resisting frames internally is made by dynamic inelastic analyses. In this work 20 regular space steel frames of the above mixed type with uniaxial natural eccentricity are designed in accordance with Eurocodes 3 and 8 and subjected to 42 pairs of far-field seismic excitations. Through extensive nonlinear dynamic analyses involving four performance levels defined by their corresponding interstorey drift ratios, a seismic response databank for these frames is created in terms of displacements, maximum interstorey drift ratios, member ductilities, eccentricities and behaviour factors values. Thus, on the basis of these analyses, the seismic behaviour of this mixed type of frames is assessed and the influence of eccentricity on the response parameters examined is evaluated.