Foundation Design using SAFE
Aim - to model the isolated footing. analyze it for pile group to be used, depth of pile and longitudnal steel on top and bottom face in both directions.
procedure - 1. open SAFE and input the following data
Single footing to be selected next
subgrade modulus = FOS x SBC/settlement = 3x150/0.05 = 9000 Kn/m^3
compression axial load for load combination is 2000 kn
Unfactored load = 2000/1.5 = 1333.33 kn
1333.33/2 = 666.55 kn
thicknesss of footing = 800mm
material property data
click DEFINE, then Material properties
M25 grade concrete
Mod. of elasticity, E = √25x 5000 = 25000N/mm^2
Fe500 rebar to be added
slab propeties defined next as shown
define dead load and live load pattersn next
define load case combination next
analysis to be performed after this step
perform analysis by adding design strip
A2 - Aim - to model adn analyze the pile cap on SAFE to evaluate the following
data - column size = 600x600mm
unfsctored load = 1175 Kn
pile length= 16m
pile diameter = 500mm
load carrying capacity = 200Kn
Calculation = no of pilers = 1175/200 = 5.8 = 6
spring constant = E x A / L
E= 25000N/mm^2
A = π/4 x 500^2 = 196349 mm^2
pile lenght = 16000 mm
spring constant = E x A/L = 25000x196349/16000=306795 N/mm
open SAFE and input the settings. 50mm cover at top and bottom. bar size = 16mm
select M25 grade of concrete and E = 25000 N/m
define pile cap details
column details
pile details
draw points
modify edge distance to 0.3m
create 600x600mm column using draw option
add springs next
dead load and live load of 587.5 kn added next
after running analysis, max displacement was found to be 0.840 whoch is safe
all punching shear values are less than 1 so its safe
joint reaction diagram
add reinforcement details in X and y direction and run analysis
slab reinforcement design
pile cap doundation design
