Pile Capacity

Rating:
12

Description


Pile Geotechnical and Structural Capacity Check

1.0 Input

1.1 Design Soil Parameters

1.2 Pile Details
 Existing ground level 
 Pile Diameter, D
 Pile Cut-off level
 Dredge level 
 Scour level 
 Pile Founding level 
 Depth from G.L.corresponding to F.L.
 Pile Embedment length
 Total Pile Length, L 
 Pile Density
 Factor of Safety 
 Pile Fixity condition at top
 Grade of Concrete
 Modulus of subgrade reaction at fixity zone
 Type of soil in fixity zone 
 Unsupported Length of Pile, L1
 Allowable displacement of pile at head
 (For Horizontal capacity)
 
1.3 Sketch

2.0 Calculation of Vertical Capacity
 Ultimate Capacity of Pile , Qult = Qb + Qs - Wp
 Whetre, Qb = Ultimate End Bearing
 Qsafe = Qult / FOS
 Where, FOS = Factor of Safety
 
2.1 Calculation of Skin Resistances
2.1.1 Layer-1:
 Layer thickness, L1
 Pile embedment in the layer, h1
 Ultimate Skin Resistance, Qs1    = 
 Where, Reduction factor, a 
 Ultimate Skin Resistance, Qs1    = 
2.1.2 Layer-2:
 Layer thickness, L2
 Pile embedment in the layer, h1
 Ultimate Skin Resistance, Qs2    = 
 Where, Reduction factor, a 
 Ultimate Skin Resistance, Qs2    = 
2.1.3 Layer-3:
 Layer thickness, L3
 Pile embedment in the layer, h3
 Ultimate Skin Resistance, Qs3    = 
 Where, Reduction factor, a 
 Ultimate Skin Resistance, Qs3    = 
2.1.4 Layer-4:
 Layer thickness, L4
 Pile embedment in the layer, h4
 Ultimate Skin Resistance, Qs4    = 
 Where, Reduction factor, a 
 Ultimate Skin Resistance, Qs4    = 
 Total Ultimate Skin resistance, Qs = Qs1 +Qs2 +Qs3 +….. +Qsn

2.2 Ultimate End Bearing Resistance
 Ultimate End bearing Resistance, Qb = (c* Nc + Pd * Nq ) * Ap
 Where, 
 Ultimate End bearing Resistance, Qb = (c* Nc + Pd * Nq ) * Ap

2.3 Self Weight of the Pile, Wp
 Self weight of the Pile , Wp = Ap * L * gp
 Where, Area of pile, Ap 
 Self weight of the Pile , Wp = Ap * L * gp
 
2.4 Ultimate Capacity of the Pile , Qult  = Qb + Qs - Wp
 Where, Ultimate End Bearing, Qb
 Ultimate Capacity of the Pile , Qult  = Qb + Qs - Wp
 
2.5 Safe Capacity of Pile, Qsafe = Qult / FOS
 Where, Ultimate Capacity of Pile, Qult 
 Safe Capacity of Pile, Qsafe = Qult / FOS
 
3.0 Tension Capacity of Pile
 Ultimate Tension Capacity of the Pile , Qult(T)  = 2/3 x Qs + Wp
 Where,  Ultimate Skin Resistance, Qs 
 Ultimate Tension Capacity of the Pile , Qult(T)  = 2/3 x Qs + Wp
 Safe Tension Capacity of the Pile , Qsafe(T)  = Qult(T) / FoS
 Where, FoS = Factor of Safety 
 Safe Tension Capacity of the Pile , Qsafe(T)  = Qult(T) / FoS
 
4.0 Fixity Depth Calculation
 Pile fixity condition at top 
 Type of Soil in fixity zone
 Modulus of subgrade reaction at fixity zone, K
 Elastic modulus of concrete, Ec = 5000 * SQRT(fck)
 Where, fck  = Characteristic strength of concrete 
 Elastic modulus of concrete, Ec = 5000 * SQRT(fck)
 Moment of inertia of Pile, I = 3.14 /64 *D^4
 where, D = Diameter of the pile 
 Moment of inertia of Pile, I = 3.14 /64 *D^4
 Relative Stiffness factor, T = (EI/K)^(1/5)
 Unsupported length of pile, L1
 Ratio of L1/T or L1/R  
 Lf/T or Lf /R = 
 Therefore, Fixity Depth , Lf = 
 Fixity depth, in terms of diameter of pile

5.0 Minimum Pile Length for lateral Capacity
 Minimum Pile Length for flexible pile, Lmin  
 Where, T = Relative stiffness factor
 Let us consider a minimum length of pile , Lmin =
 
6.0 Horizontal Capacity of the Pile
 Pile fixity condition at top
 The horizontal capacity, H 
 Where,  y = Diaplacement of pile at head 
 The horizontal capacity, H  =
 
7.0 Summary of Calculations
 Pile Diameter 
 Pile Cut-off level
 Pile Founding Level
 Safe Vertical Capacity
 Safe Tension Capacity
 Pile head Condition
 Grade of Concrete
 Horizontal capacity for a Displacement of
 Minimum Pile length for Lateral Capacity
 Fixity Depth, Lf

Calculation Reference
Pile Capacity
Geotechnic Calculations
Soil Mechanics

Calculation Preview

Submitted On:
06 Feb 2015
File Size:
357.50 Kb
Downloads:
292
File Version:
1.0
File Author:
Sam
Rating:
12

 
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Comments: 1
JohnDoyle[Admin] 7 years ago
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