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Second Floor Beam Design Calculation

This document contains calculations for the design of Beam B5, which is 3.5 meters long with dimensions of 250mm x 350mm. It determines the required longitudinal and transverse reinforcement based on the beam's properties and design loads. The minimum required longitudinal reinforcement is calculated to be 91 square mm and the maximum spacing of transverse reinforcement is determined to be 100-140mm depending on the beam section. Skin reinforcement is not required as the beam depth is less than 900mm.

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Arnold Verceles
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89 views3 pages

Second Floor Beam Design Calculation

This document contains calculations for the design of Beam B5, which is 3.5 meters long with dimensions of 250mm x 350mm. It determines the required longitudinal and transverse reinforcement based on the beam's properties and design loads. The minimum required longitudinal reinforcement is calculated to be 91 square mm and the maximum spacing of transverse reinforcement is determined to be 100-140mm depending on the beam section. Skin reinforcement is not required as the beam depth is less than 900mm.

Uploaded by

Arnold Verceles
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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SECOND FLOOR BEAM DESIGN CALCULATION

Group : G3
Beam No : B5
Analysis Reference (Member) 3.9m : 30
Beam Length : 3500 mm
Breadth (B) : 250 mm
Depth (D) : 350 mm
Effective Depth (d) : 280 mm
Design Code : ACI 318M - 2011
Beam Type : Ductile Beam (Special Frame)
Grade Of Concrete (f'c) : C21 N/sqmm
Grade Of Steel : Fy230 N/sqmm
Clear Cover (Cmin) : 40 mm
Es : 2x10^5 N/sqmm
Mubal : 104.24 kNm
As,min (flex) (B) : 426.09 sqmm
As,nominal (Bn) : 91 sqmm
As,min(user input)(B') : 91 sqmm

For Longitudinal Reinf


Beam Bottom Beam Top
Left Mid Right Left Mid Right
Critical L/C - Analysis 15 7 17 9 17 7
Critical L/C - RCDC 11 3 13 5 13 3
Mu (kNm) 25 19.05 20.76 45.58 14.94 47.3
As (flex) (sqmm) (C) 449.92 339.18 370.87 853.35 264.29 888.77
Asc (flex) (sqmm) (A) - - - - - -
Tu (kNm) - - - - - -
Tcr/4 (kNm) - - - - - -
Al, min(sqmm)(Tor.) - - - - - -
Al (sqmm) (Tor.) (E) - - - - - -
Al (Dist) (sqmm) (D) - - - - - -
Ast (sqmm) 449.92 426.09 603.18 853.35 351.5 888.77
AstPrv (sqmm) 603.18 603.18 603.18 942.48 402.12 1206.36
3-#16 3-#16 3-#16 3-#16 2-#16 3-#16
Reinforcement
3-#12 3-#16

Note: Calculation of Ast

Ast = Max {B, C+D, A+D} (for Mu > 0 and C x 1.33 > B)
Ast = Max{B', C x 1.33 + D, A+D} (for Mu > 0 and C x 1.33 < B)
Ast = Bn (for Mu = 0)
Where,
Compression reinforcement required for
A = Asc (flex) =
bending moment
B = As,min (flex) = Min area of flexural reinforcement
Bn = As,nominal = Nominal area of reinforcement
Total area of longitudinal reinforcement
C = As (flex) =
calculated at a given section
D = Al (Dist) = reinforcement at section considered
Max(Al,min (Tor), Al (Tor)) x ((2B) / (2B +
Ast (Dist) (sqmm) =
2D))

For Transverse Reinf


Left Mid Right
Critical L/C - RCDC 1 1 1
PtPrv (%) 1.346 0.862 1.723
Vu (kN) 19.9 14.94 22.09
Mu-Sect (kNm) 12.49 0.6 16.32
VD+L (kN) 20.68 0 20.48
Mh (kNm) 67.64 0 83.63
Ms (kNm) 45.19 0 45.19
Sway-Right (kN) 20.21 0 61.38
Sway-Left (kN) 56.5 0 15.34
Vu-Sway (kN) 56.5 0 61.38
Vud (kN) 56.5 0 61.38
Φ Vc (kN) 35.08 36.95 35.46
Vs (kN) - - -
Av (sqmm/m) 380.43 380.43 380.43
Tu (kNm) 0 0 0
Aoh (sqmm) - - -
At (sqmm/m) - - -
Legs 2 2 2
Stirrup Rebar 10 10 10
At Torsion (sqmm/m) - - -
Av Total Reqd (sqmm/m) 380.43 380.43 380.43
Asv Reqd (sqmm/m) 416.48 380.44 473
SCalc (mm) 100 140 100
SPrv (mm) 100 140 100
Av Total Prv (sqmm/m) 1570.8 1122 1570.8

Maximum Spacing Criteria

Basic
Spc1 =d/2 = 140 mm
Spc2 = 300 mm

For Ductility (Special Frames)


Left Section, Right Section
=
Spc3 = 6 x Small Longitudinal Dia 72 mm
Spc4 = d / 4 = 70 mm
Spc5 = 150 mm
Provided Spacing = 100 mm

Mid Section
Provided Spacing = 140 mm

Skin reinforcement

Beam Width = 250 mm


Beam Depth = 350 mm
Depth = 350 <= 900, Hence Skin Reinforcement is not required.

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