THE STUDY OF THE BEHAVIOUR OF SIMPLY SUPPORTED PLAIN CONCRETE & STEEL REINFORCED CONCRETE BEAMS WITH CIRCULAR OPENING

Abstract

provided for passage of fresh water & sewage piping or conduits or ducts in residential & industrial structures. These opening provided in the beams decreases the load carrying capability of the R.C.C beam drastically in comparison to the design strength of the beam with no opening. The reduction in strength is a factor of various variables like diameter of opening, shape of opening, location of opening etc. In this study a number of Plain concrete and R.C.C beams were cast, with and without opening and various other factors were varied like diameter of opening, location of the openings, area of tension & compression reinforcement, spacing of shear reinforcement etc., were varied to establish the effect of variation of all these parameters on the beam strength and to develop the relationships between these variables and strength of the beam. The beams were tested according to the relevant Indian Standards; the beams underwent the following tests during the course of the preparation of this report; 1. Load deflection test- Two Point Load. 2. Flexure Test- Two Point Load. 3. Uniaxial Compression Test (cubes) 4. Ultrasonic Pulse Velocity (U.P.V). 5. Rebound Hammer Test, The data from the above tests were analyzed and compared with the F.E.M model of the plain concrete beams to establish different relationships defining the behavior of such structural members.M.