A 0.45m square pile is to be driven at a depth of 10m into the soil. What is the allowable pile capacity? Use FS=3.0 and a Critical Depth of 4m for Loose Sand. GWT is at 3.0m from the Natural Grade Line (NGL). Qu = EQSF + QrQu = Ultimate Load CapacityEQSF = Load carried by friction developed at the side of the PileQr = Load carried at the Pile TipEQs = A,f, (Sand) + A,f; (Clay)• EQSF = Asfs (Sand) + Aşfs (Clay)For Sand LayerFor Clay Layerf, = o'n tana = K,oʻ, tanaf, = aS.on = Effective Horizontal Stressa = Empirical Adhesion Factor%3DSu = Undrained Shear strength at theO = Friction AngleClay LayerFor the Pile Tip, Qr = Ast ftQr = AST ftFor Sand LayerFor Clay Layerf = qNqf; = cNcAST = Area of the TipAST = Area of the Tip%3DNOTE: After the specified critical depth has been reached, effective stress alongthe pile remains constant regardless if it is clay or sand.Qfriction of clay depends on the given a and cQfriction of sand depends on effective stress, Nq, k and tan a NGLCriticalLoose Sand ydry=15kN/m3ysat=17kN/m3Nq=303mGWTDepth=4mØ=28tan a=0.454mK=3.0Hard ClayNc=910mC=200kPaysat=20kN/m3a=0.5Effective Stress

B (size of pile) = 0.45m d (depth of pile) = 10m FOS = 3

A 0.45m square pile is to be driven at a depth of 10m into the soil. What is the allowable pile capacity? Use FS=3.0 and a Critical Depth of 4m for Loose Sand. GWT is at 3.0m from the Natural Grade Line (NGL).

A 0.45m square pile is to be driven at a depth of 10m into the soil. What is the allowable pile capacity? Use FS=3.0 and a Critical Depth of 4m for Loose Sand. GWT is at 3.0m from the Natural Grade Line (NGL).

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Load and resistance factor design

Load and resistance factors design (LRFD), also known as Limit state design (LSD), refers to the design method used in building engineering. A boundary condition is a condition of a structure where it can no longer meet the relevant design requirements. The condition may refer to the load level or other actions on the structure, while the terms refer to the integrity of the structure, suitability for use, durability, or other design requirements. A structure designed for LRFD is limited to keeping track of all possible actions during its design time and is always ready for use, with the appropriate level of reliability in each boundary condition. LRFD-based construction codes clearly define the appropriate levels of reliability in their instructions.

Question

Qu = EQSF + Qr
Qu = Ultimate Load Capacity
EQSF = Load carried by friction developed at the side of the Pile
Qr = Load carried at the Pile Tip
EQs = A,f, (Sand) + A,f; (Clay)
• EQSF = Asfs (Sand) + Aşfs (Clay)
For Sand Layer
For Clay Layer
f, = o'n tana = K,oʻ, tana
f, = aS.
on = Effective Horizontal Stress
a = Empirical Adhesion Factor
%3D
Su = Undrained Shear strength at the
O = Friction Angle
Clay Layer
For the Pile Tip, Qr = Ast ft
Qr = AST ft
For Sand Layer
For Clay Layer
f = qNq
f; = cNc
AST = Area of the Tip
AST = Area of the Tip
%3D
NOTE: After the specified critical depth has been reached, effective stress along
the pile remains constant regardless if it is clay or sand.
Qfriction of clay depends on the given a and c
Qfriction of sand depends on effective stress, Nq, k and tan a

NGL
Critical
Loose Sand ydry=15kN/m3
ysat=17kN/m3
Nq=30
3m
GWT
Depth=4m
Ø=28
tan a=0.45
4m
K=3.0
Hard Clay
Nc=9
10m
C=200kPa
ysat=20kN/m3
a=0.5
Effective Stress

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