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    Staircase Design PDF

    Uploaded by

    Ajit Yadav
    This document provides design details for a staircase, including dimensional parameters, material properties, and load calculations. It then summarizes the structural design of the staircase slab and steps. The minimum required slab thickness is 120.962 mm. With a slab thickness of 152.4 mm, the design satisfies requirements for load capacity, shear strength, steel reinforcement, development length, and deflection.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Staircase Design PDF

    Uploaded by

    Ajit Yadav
    216 views2 pages
    This document provides design details for a staircase, including dimensional parameters, material properties, and load calculations. It then summarizes the structural design of the staircase slab and steps. The minimum required slab thickness is 120.962 mm. With a slab thickness of 152.4 mm, the design satisfies requirements for load capacity, shear strength, steel reinforcement, development length, and deflection.

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    Staircase_Design.pdf

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    This document provides design details for a staircase, including dimensional parameters, material properties, and load calculations. It then summarizes the structural design of the staircase slab and steps. The minimum required slab thickness is 120.962 mm. With a slab thickness of 152.4 mm, the design satisfies requirements for load capacity, shear strength, steel reinforcement, development length, and deflection.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    216 views2 pages

    Staircase Design PDF

    Uploaded by

    Ajit Yadav
    This document provides design details for a staircase, including dimensional parameters, material properties, and load calculations. It then summarizes the structural design of the staircase slab and steps. The minimum required slab thickness is 120.962 mm. With a slab thickness of 152.4 mm, the design satisfies requirements for load capacity, shear strength, steel reinforcement, development length, and deflection.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    Staircase Design

    Data
    Riser 175 mm
    Tread 275 mm
    Span 3145.00 mm
    Fck 20 MPa
    OD of Slab
    <=300 275 250 225 200 175 =>150
    Fy 500 MPa mm
    Density of Concrete 25 kN/mm2 k 1 1.05 1.1 1.15 1.2 1.25 1.3
    Live Load 3 kN/m2
    Width of Slab 1.00 m 22.255 kN/m
    Finish Load 1.5 kN/m2 12.465 12.465
    Waist Slab Length 2.24 m A B
    Landing A length 0.91 m Landing A Waist Slab Landing B
    Landing B length 0.00 m 0.91 m 2.235 m 0 m
    Effective Cover = 15 mm
    Landing Width 1 m 3.145 m

    Min.Slab depth required= 120.962 mm


    Slab Depth Tried= 152.4 mm
    D.L. of flight
    Step Section= 0.024 m2
    Inclined Slab= 0.090 m2
    Total Area= 0.114 m2
    D.L. of step section, 1m in width and 275 mm In plan length= 2.8425 kN/m
    2
    D.L. per m on plan= 10.337 kN/m2
    F.L.= 1.5 kN/m2
    L.L= 3 kN/m2
    Total dead load= 14.837 kN/m2
    Factored load= 22.255 kN/m2
    Total fact load in 1 m Wide Slab=22.255 kN/m
    Landing A
    Self Weight of Slab= 3.81 kN/m2
    Finish Load= 1.5 kN/m2
    Live Load = 3 kN/m2
    Total Load= 8.31 kN/m2
    Factored Load= 12.465 kN/m2
    Total D.L. in 1 m Wide Slab= 12.47 kN/m
    Landing B
    Self Weight of Slab= 3.81 kN/m2
    Finish Load= 1.5 kN/m2
    Live Load = 3 kN/m2
    Total Load= 8.31 kN/m2
    Factored Load= 12.465 kN/m2
    Total D.L. in 1 m Wide Slab= 12.47 kN/m
    Stair Flight
    Total load on Staircase= 61.083
    Reaction at A = Vu 30.541 kN Rough
    Maximum moment Mu = 30.466 kNm 48.026 15.411 2.1484
    Effective depth required= 105.064 mm
    Adopted effet.depth d = 137.4 mm
    Overall depth D = 152.4 mm 6 "
    Steel Design
    Mu = 0.87*fy*Ast* d (1 - fy*Ast/fck*b*d)
    c b a
    509.7339888 -1 0.00018
    Ast.= 568.55 4927.45 mm2
    Use 12 mm dia. Bars @ 199 mm c/c 7.8 4 inches
    Ast Provided = 12 @ 101.6 mm c/c ----> 1113.2 mm2
    Shear Check
    Nom.shear stress τv = 0.22 Mpa
    % Steel provided= 0.81 %
    τc = 0.579 MPa Table 19 IS 456 clause 40.2.1
    τ'c = 0.60821 Mpa OK in Shear
    Distribution Bar design
    2
    Astd = 182.88 mm /m
    Try steel bar 10 mm dia. Bars @ 429.46 mm c/c
    Provided spacing = 200 mm diameter = 10 mm
    2
    Provide steel area= 392.70 mm /m
    Development length check
    Ld =0.87*fy*dia./(4*taubd*1.6) 56.6406 *diameter
    Ld = 679.6875 mm Bond stress
    Mu1 = 59.65 kN M20 M25 M30 M35 M40 and above
    Vu 30.54 kN 1.2 1.4 1.5 1.7 1.9
    Lo = 0
    Ld = 2539.02 mm ok
    Deflection check
    L/d = αβγδλ
    α= 23
    β= 1 L< 10m
    Percentage of Steel= 0.81
    fs=(0.58*As required/Ast provided)*fy = 148.12 Mpa
    γ= 1.2 fig.4, pg 38 IS456
    δ= 1
    λ= 1
    Allowble L/d = 27.6
    Actual L/d = 22.89 Safe in Deflection

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