The depth of the beam increases or decreases according to their span and applied load on the beam. We can always take the standard size of the rcc concrete beam size at least 230mm x 230mm (9” x 9”) in which width and depth of beam is 230mm (9″). Mainly tension bar encounter the bending moment and stirrup of which are provided to incounter the shear forces. RCC Beam is provided with the top bar which experience compression and bottom bar which experiences tension. What size beam do I need for a 20 foot span Simply supported beam is supported at two end and continuous beam is supported by more than two support end. A cantilever beam is a rigid structural element that extends horizontally,one end is free and is supported at only one end. RCC Beam is different types like cantilever beam, continuous beam, simply supported beam, fixed beam, overhanging beam, lintel beam, primary beam and secondary beam. After assuming the width the effective depth of the beam is calculated based on the bending moment and then the overall depth of the beam is determined by adding effective cover to the effective depth calculated. This width of the should be sufficient to provide rebars with sufficient side cover and spacing between the bars. How the size of beam could be decided? In case of RCC beams an appropriate width of the beam is assumed on the basis of experience, the magnitude of maximum bending moment and in some cases on the basis of the width of the wall present below the beam.
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