Square Concrete Pedestal Design Calculation Sample 51p5o

Project No.

18-244

DESIGN OF FOOTING PEDESTAL REF: ACI CODE 318-08

Material Properties: f'c  3000psi

fy  60000psi

Strength Reduction Factor

ϕ  0.65

for Tied Column

Section Properties Length and Width of Pedestal

LPedestal  24in

Gross Concrete Area

Ag  LPedestal  BPedestal  576  in

Re-bar Specification

BPedestal  24in 2

Rebar # 

Dia of Rebar,

ϕrebar 

Area of Rebar,

Arebar 

Rebar # 8 π

 in  1  in  0.785  in

2

Number of Steel Rebar

Nrebar  8

Total Area of Steel

Ast  Arebar  Nrebar  6.283  in

2

 ϕrebar 4

2

Pedestal Capacity Check





Maximum Allowable Load on Pedestal

ϕPn  0.8ϕ  0.85  f'c  Ag  Ast  f y  Ast  951.48  kip  

Maximum Column Load on Pedestal

PMax  46kip

Pedestal Section 

"OK"

if ϕPn  PMax

"Not OK"

Pedestal Section  "OK"

if ϕPn  PMax

Ref: Footing Gravity Load Calculations

Reinforcement Ratio Check Provided Area of Steel

Ast  6.283  in

Gross Area of Concrete

Ag  576  in

Provided Reinforcement Ratio

ρ 

Reinforcement Ratio 

"OK"

2

2

Ast  100 Ag

 1.091

if ρ  1

"Not OK"

if ρ  1

Reinforcement Ratio  "OK"

Calculation For Ties Selected Tie Reinforcement

Tie # 

Dia of Rebar,

ϕTie 

Area of Rebar,

ATie 

Tie # 8 π

 in  0.375  in 2

 ϕTie  0.11  in 4

2

Spacing of Tie will be the minimum of the followings  16 Times Longitudinal Bar Diameter  48 Times Tie Bar Diameter  Least Cross Sectional Dimension of Column/Pedestal  6 in So, Selected Tie Spacing





STie  min 16ϕrebar 48ϕTie LPedestal BPedestal 6in  6  in

Summary Length of Pedestal

LPedestal  24  in

Width of Pedestal

BPedestal  24  in

Logitudinal Rebar

Nrebar  8

Dia of Rebar

Rebar #  8

Tie Bar Spacing

STie  6  in

Dia of Tie

Tie #  3

Color Legends Input Data Special Case Input Check Modify Value Based on Calculation Reference