This paper presents the results of an experimental investigation on the behavior of T-shaped RC beams with rectangular web openings under pure torsion. Seven beam specimens were tested to study the influence of geometrical parameters on the torsional strength. The investigated parameters were:(1) the flange width,(2) the flange thickness, and (3) the opening height. All specimens had the same span, same depth, same web width, and same opening length. All beams were loaded till failure. Cracking patterns were monitored