jce.7.1.10372 A Detailed Study on Rectangular RC Beam With Circular Opening Under Torsional Load Mandala Venugopal Asha Patel Vipparthi Rajesh Journal on Civil Engineering 2249-0779 7 1 32 36 RCC, Circular Opening, Torsional Load, GFRP, Retrofitting Provision of utility and service ducts are important part of modern building construction. To facilitate fast and uninterrupted progress, the layout of these ducts are planned in advance. Their positions are decided considering the head room provisions in buildings, aesthetic look, etc., without jeopardizing the strength, stability and serviceability of the structures. To fulfill these aspects, often ducts have to pass through main load bearing elements like beams. The present work is to explore the behavior of rectangular RCC beams with circular opening under torsion load. The torsional capacity of beams with opening are extracted experimentally. The study is extended by retrofitting the beams with four layers of bidirectional woven GFRP fabric applied by following orientation 90/90/90/90.The restoring torsion capacity, crack patterns are observed and the strength has been increased by retrofitting. December 2016 - February 2017 Copyright © 2017 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=10372