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Descrição: Design of Reinforced Concrete Foundation
Design of Reinforced Concrete FoundationDescripción completa
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Design of Grillage Foundation
Input data
Axial load on grillage beam (t)
200 Bearing capacity of soil (t/sqm)
30
Column section MB 500
A s s u m e d d at at a
Upper tier beam section Lower tier beam section
MB 300 MB 250
Nos. of upper tier beam Nos. of lower tier beam
3 10
Section Properties
Column section 10 MB 500 D (mm) Upper tier beam 6 MB 300 D (mm) Lower tier beam
500 300
5 MB 250 D (mm)
B (mm) tw (mm)
250
180 7.70
tw (mm)
3
599
h2(mm)
29.9
3
410
h2(mm)
27.95
Zxx (cm ) Zxx (cm )
6.90
Analysis & design
Assuming foundation weight to be 15% of column axial load, total load on the base of footing (t) Size of of fo foundation re required (s (sqm) 2.77 Provide si size of of fo foundation 3
230
1. Column base plate
Size of base plate required (mm) P (Using eqn. {a+2*sqrt(3)*h2}*tw
243 <=
250)
Thickness of base plate required (mm)
62.2
Thickness of base plate provided (mm)
70.0
Size of square base plate provided (mm) 600 2 w (N/mm ) A (mm) 210 B (mm) 50
(Using eqn.
P r o v i d e s q u a r e b as e p l a t e o f s i z e
