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Type of Problems in Doubly R.C. Beam | Civil Experience

 In Doubly R.C. Beam Section There are two types of problem

    1. Analysis of section 
    2. Design of section

    Derivation of problem solving Formula

    1. Analysis of section

    Suppose 
    Cross-section of beam and steel are given
    Depth of N.A. ( Xu ) and Mu are to be calculated

     

    To find Xu


    Doubly R.C. Beam
    Stress Dia of Doubly R.C. Beam
    Fig. from Atul Prakashan book
                        b = width of beam
                        d = effective depth
                        d' = eff. cover to compression steel
                        D = overall depth
                        Xu = depth of N.A. ( natural axis )
                        Ast1 = Area of tension reinforcement required for balanced singly R.C. beam
                        Ast2 = Area of additional tension reinforcement
                        Ast = Ast1 + Ast2
                               = Area of total compression reinforcement
                        fsc = stress in compression reinforcement
                        fcc = comp. stress in concrete at the level of comp. steel


    To find Xu of doubly r.c. beam
    To find Xu
    Fig. from Atul Prakashan book


    To find Mu


    Doubly R.C. Beam
    To find Mu
    Fig. from Atul Prakashan book


    2. Design of section


    Design of section
    Design of section
    Fig. from Atul Prakashan book

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