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Strap Footing: Design

The document provides design calculations for the strap footing of a building foundation in accordance with BS8110. It includes load assumptions, dimensions, reinforcement requirements, and moment and shear calculations for the strap beam and individual footings.

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Mervana Mograby
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39 views2 pages

Strap Footing: Design

The document provides design calculations for the strap footing of a building foundation in accordance with BS8110. It includes load assumptions, dimensions, reinforcement requirements, and moment and shear calculations for the strap beam and individual footings.

Uploaded by

Mervana Mograby
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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Strap footing

In accordance with BS8110


Design will be done for
Pu1 200 kN Pw1 138 kN Strap beam and F1 only
Pu2 200 kN = 138 kN
Pw2
S 6.3 m L1 0.95 m
L1 3 m
=
= P 200 P 200
Recommen
SBC 200 kN/m2 qall 200
ded kN/m2 u1 u2

h filling 0 m =ex 0.5 m


x 1 m = 200 kN S
L2 3.00 m
R1 200 kN
R2
B2 3.00 m Are 0.76 m2 B
B 0.26 m
q
1
A=prov13.50 m2 F2
B1 4.50 m F1
>>>
Net upward pressure for F1/ F2 1.0 0.50 44260.50
Net Q1 = 66.7 kN/m Per total B1 R1 200 R 200
Net Q2 = 66.7 kN/m Per total B2 = 2

Design
=
fcu 30 fy 460 cover = 50 mm
P P
Strap Beam Design u1 u2

H 600 mm
b= 250 mm
Mu = 100.0 kN.m
k= 0.044 67 67
z= 522 mm 2.00 0.00 2.3 1.5 1.5
As req = 479 Top 1 φ 25
As min= 300 Bott 2 φ
16 100.0
Footing F1 Design 66.7 0.0
Columns 0.4 x 0.4
L B D mm -133.3
3 4.50 55 -100.0
Net Q1 = 15 kN/m2 -100.0 -100.0
Mu = 13 kN.m
k= 16.692 0.0
z= Err:502 mm Both way

As req = Err:502 Err:502 12 33.3


φ
As min= 71.5 12 Err:502
@ Note:SF/BM diagrams are not to scale 75.0

Calculation for moment & Shear

M1 33.3 V1 66.7

M2 -100.0 V2 -133.3

M3 -100.0 V3 0.0

M4 0.0 V4 100.0

M5 75.0 V5 -100.0

M6 0.0 V6 0.0

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