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    Design of Short Column

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    Anton_Young_1962
    The document provides data to design a short column including concrete strength, rebar yield strength, load on the column, rebar percentage, and bar diameters. It then calculates the required cross-sectional area and dimensions of the column to support the load. Finally, it determines the required area of longitudinal rebar and calculates the spacing of transverse confinement bars.

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    Design of Short Column

    Uploaded by

    Anton_Young_1962
    49 views2 pages
    The document provides data to design a short column including concrete strength, rebar yield strength, load on the column, rebar percentage, and bar diameters. It then calculates the required cross-sectional area and dimensions of the column to support the load. Finally, it determines the required area of longitudinal rebar and calculates the spacing of transverse confinement bars.

    Original Description:

    Original Title

    18. Design of Short Column

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    © © All Rights Reserved

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    The document provides data to design a short column including concrete strength, rebar yield strength, load on the column, rebar percentage, and bar diameters. It then calculates the required cross-sectional area and dimensions of the column to support the load. Finally, it determines the required area of longitudinal rebar and calculates the spacing of transverse confinement bars.

    Copyright:

    © All Rights Reserved
    49 views2 pages

    Design of Short Column

    Uploaded by

    Anton_Young_1962
    The document provides data to design a short column including concrete strength, rebar yield strength, load on the column, rebar percentage, and bar diameters. It then calculates the required cross-sectional area and dimensions of the column to support the load. Finally, it determines the required area of longitudinal rebar and calculates the spacing of transverse confinement bars.

    Copyright:

    © All Rights Reserved
    of 2

    18.

    Design of Short Column

    Given Data : Find : Ag & Ast

    Compressive strength of concrete f'c := 28 MPa

    Yeild strength of reinforcement fy := 350 MPa

    Load on Column Pu := 2600 kN

    Percentage of rebar ρg := 2 %

    Main bar db := 28 mm

    Confinement bar dv := 8 mm

    Strength reduction facotor ϕ := 0.65 for compression member

    Solution Reference

    Axial Compression Strength of Column

    ( )
    ϕPn = Pu = ϕ ( 0.8 )  0.85  f'c Ag − Ast + Ast fy

    (ACI.10.3.6)

    Ast = Ag ρg

    ( )
    ϕPn = Pu = ϕ ( 0.8 )  0.85  f'c Ag − Ag ρg + Ag ρg fy

    ( )
    ϕPn = Pu = ϕ ( 0.8 )  0.85  f'c Ag 1 − ρg + Ag ρg fy

    ( )
    ϕPn = Pu = ϕ ( 0.8 )  Ag 0.85  f'c 1 − ρg + ρg fy

    Pu
    ϕ 0.8 2
    Ag.req := Ag.req = 164885.899  mm
    ( )
    0.85  f'c 1 − ρg + fy ρg
    b
    λ= λ := 1
    h

    h := Ag.req h = 406.061  mm Assume h := 400 mm

    b := h λ = 400 mm Assume b := 400 mm

    2
    Ag.pro := b h Ag.pro = 1600 cm

    Axial Compression Strength of Column

    ( )
    ϕPn = Pu = ϕ ( 0.8 )  0.85  f'c Ag.pro − Ast + Ast fy (ACI.10.3.6)

    (
    ϕPn = Pu = ϕ ( 0.8 )  0.85  f'c Ag.pro − 0.85  f'c Ast + Ast fy )
    ( (
    ϕPn = Pu = ϕ ( 0.8 )  0.85  f'c Ag.pro + Ast fy − 0.85  f'c ))
    Rebar area require for column

    Pu
    − 0.85  f'c Ag.pro
    ϕ 0.8 2
    Ast := Ast = 3654.2  mm
    fy − 0.85  f'c

    1 1 1
    Rebar arranges D :=  1 0 1 
     
    1 1 1
    Rebar area by layer in rows

    π db cols( D)  i
    2  1847.256 
    As =  1231.504   mm

    2
    As :=  D
    4  
    i =1  1847.256 

     As
    2
    Rebar provides Ast.use := Ast.use = 4926.017  mm

    Spacing of Stirrup

    (
    Scolumn := min 16 db , 48dv , b ) Scolumn = 384 mm (ACI.7.10.5.2)

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