Monday, November 27, 2023

# How To Calculate Pile Load Capacity Static Analysis

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### 1. How To Calculate Pile Load Capacity Static Analysis

The highest load-carrying capacity of a pile is the maximum load that it can bear without failure or extreme settlement of the ground.

The bearing capacity of a pile mostly relies on 3 factors as noted below,

a. Type of soil through which the pile is piled

b. Pile Installation Method

c. Pile Dimensions (Cross Section and Pile Length)

When estimating the pile load capacity for cast in situ concrete piles, utilizing static analysis, we need to utilize the soil shear strength parameter and the dimension of the pile.

### 2. Load Bearing Capacity Of Heap Using Static Analysis

The pile transfers the load to the soil in two ways. First, through tip-in compression, which is called “end bearing” or “point bearing“; secondly, shearing along the surface” is termed as skin friction.

### 3. Load Bearing Capacity of Cast In-situ Piles in Cohesive Soils

Final load-carrying capacity (Q.)You). The pile in the connective soil is given by the formula given below, where the first term denotes end bearing resistance  (Whyb)  and gives the second term skin abrasion resistance (Whys.

 Qu = Ap Nc Cp+ n∑i=1 αi Ci Ast

Where,

WhyYou = final load capacity, kN

aP = area of ​​cross-section of the top of the pile, m2.

nC = bearing capacity factor can be taken as 9.

αI = the adhesion factor for the ith layer depending on the consistency of the soil. It depends on the non-irrigated shear capacity of the soil and can be obtained from the figure given below.

CI = average cohesion for the ith layer, kN/m2

aSI = surface area of ​​the pile shaft in the ith layer, m2

A minimum factor of 2.5 is used to arrive at a safe pile load capacity (Q.)Safe) from final load capacity (q.)You,

WhySafe = QYou/2.5

### 4. Load-bearing Capacity of Cast-in-situ Piles in Non-Cohesive Soils

The final load-carrying capacity of the pile, “QYou“. There are two parts. One part is caused by friction, which is called skin friction or shaft friction or side shear denoted as “Q”s“And the second reason is the end bearing at the base or tip of the pile toe, “Qb,

The equation given below is used to calculate the final load-carrying capacity of the pile.

 Qu = Ap( 0.5DyNy+ Pd Nq) + n∑i=1 Ki Pdi tanρA

Where,

aP = area of ​​cross-section of pile base, m2

D = diameter of pile shaft, m

ρ = effective unit weight of soil at the tip of the pile, kN/m3

nI= bearing capacity factor

nWhy = bearing capacity factor

A = angle of internal friction at the end of the pile

PD = effective overburden pressure at the pile tip, kN/m2

K= coefficient of earth pressure applied to the ith layer

Pd = Effective overburden pressure for the ith layer kN/m2

II = angle of friction of the wall between the pile and the soil for the ith layer

aSI = surface area of ​​the pile shaft in the ith layer, m2

The first term is the expression for the final bearing capacity of the pile (Whyb) and the second term is the expression for the skin friction capacity of the heap (Whys,

A minimum factor of 2.5 is used to arrive at the safe stack capacity (q.)Safe) from final load capacity (q.)You,

WhySafe = QYou / 2.5

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Er. Madhu Krishna Poudel ( Founder )
Madhu Krishana Poudel is a distinguished Civil Engineer with extensive experience in site supervision, estimation, and AutoCAD 2D and 3D design. Holding a Bachelor's degree in Civil Engineering from Pokhara University, his work and expertise have earned recognition in reputable sources such as USA Today, Time, Wikipedia, and TheRichest, establishing his credibility and trustworthiness in the construction industry.
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