SEISMIC RESPONSE OF REINFORCED CONCRETE BRACED FRAMES

Abstract

3rgoins gimbal aro widely used in stile frames due to their ability to reduce lateral dteplecements. Such braced frame* mode of reinforced Colleret. sr* not used beans, their seissie response is not unieretood Sraosa from with different braala patterns and bWaaiad proportions and endmoonnestio ore oonsidered• The Oust/ wse performed with the pupae. ( to de/1W nn641ro standing of the *lotto behaviour of reinforced °motets 'kneel frame. (b) to determine difference in behaviour of frame with momentaiesistant (rigid) bracing meibers and axially loaded, (piniiinded) bracing sembers• The dynamic behaviour of frames was studied bath by seismic eoeffloient method and by nodal analysis method forty. sizirtorey. two obey Ioneentrically *seed fraaes of different patterns and *ix Secentrically braced from of split Upattern wars analysed using anent resistant or Axially loaded tames. it was determined that brooe*end connection dose not influence the elastic behaviour of oonoentrically braced frames, Whereas* it does affect be haviour of eacentricolly braced trues. it was found that braes stiffness has siggificant effect on the seismic weapons* of trued frames. Tar neater force* and lateral disploacw. Lateral di lacemeste end member *Mole in eseentricall4y breeed split Wrote, were much highs* then thole in come,' Woolly buced frames* Snails behipriour of eonoentrically broiled fruit wes seamed with that of five shear wallotrames end three maid shear wells. Sneed frames wars found better' It was verified that stiffness of teams hoe signiflosot effect on the response of coupled shear wells while stiffness of shear wall alone does not Unmans* the behaviour of shear wel frame, significant/7 Meet of lintel bands on the Seismic response of frame was studied on eight frames having different lintel stiffness and arrangement and it we concluded. that slender bends do not affect the slush response. Only tends of Couparativeur large stiffness need be considered in analysis. It also found that the model eml fie lesser Lateral term then those obtained by the se/Ado efficient **OA in all the french Storey shears and lat+re force distribution were very much different as obtained by these methods* It is elenemical sad rational to analyse the strueturee using modal analysis Win though the IS le 5 1975 recomaends the use of Weeds coefficient method for regular buildings lower than 40 eletris in height.