INELASTIC BEHAVIOUR OF ECCENTRICALLY BRACED STEEL FRAMES UNDER CYCLIC LOADING

Abstract

A anignsa praettCal structural systa. the eccentric bring system* La found to possess many advantages over aoMentric braainO system to the, aseiss a design ct steel structure. This system acaploys diagonal braces with deliberately 1ares scønstrialties with respect to the base Coins Joint. They are Crd to possess the elastic strength and sti!ln.sa of a Convantianaliy braced Emcee and the energy dieajpattm of a steel moment resisting bares. In order to simplify the ratios of stiffness of a braced fraae the aonventia l method aonaista of ass g (a) the braces b izsdergo axial deformatians only. (b) only the tensile braces c ntributs to the stiffness of the structure. and (a) braces undo go axial dofoznaticns only and set in parallel with the skeleton lr s. This investigation covers detail. a mperinfl a1 and th eorritical studies as the 'inelastic behaviour of •acsntricsliy paced stet f `ernes cyclic repeated load&Ws Mm asalasso viewpoint• sbt the verxt atto of experimental values of frequencies of the frames, slalptied deta tharion of the saga has been vAs with the help of a digital computer pragrssn~e, The static load deflect hysteresis curves of the tresses indicate a higher energy absorption capacity and thonesed d ttttLty at eccentricat ty bread Erase over aarnc.*rt aaliy breed system# a tnture durable In eceiric desica of structures. Eccentric bracifp fletats, tairetre4 offer an sttraotive possibility for Vpliaad on in steel bu,361rn fram