REINFORCEMENT DETAILING FOR OPENING CORNERS

In the present study c onventional a rrangements of detailing of rebars in the opening corners have been shown to be structura lly inadequate and an improved but simple detailing of opening corners has been proposed which gave corner efficiencies in the range of 90 to 95%. The work includes performance review of three recommended detailing systems namely, L - type (SP1), inverted U - type with corner stirrups (SP2 ), U - bars lap spliced with the main reinforcem ent (SP3) and on the basis of observed behavior, a modifi ed detailing arrangement, to be used in the corner joints subjected to opening moment has been recommended . The experimental work consisted of testing nominally identical planer portal - type opening corner specimens made of normal strength concrete under monotonically increasing static load s. The results obtained are analysed in terms of crack width s , ultimate load and corner efficiencies of the specimen s.