Allowable Load for given Safety Factor Calculator

✖Shaft Resistance is the load-bearing capacity of deep foundations such as piles or drilled shafts, derived from the frictional resistance along the sides of the shaft.ⓘ Shaft Resistance [Q _su]			+10% -10%
✖Toe Resistance is the capacity of the soil at the base or toe of a structure (such as a retaining wall, foundation, or slope) to resist sliding or overturning.ⓘ Toe Resistance [Q _bu]			+10% -10%
✖Factor of Safety in Pile Foundation is the ratio of the ultimate capacity of the pile to the working load (the load the pile is designed to carry safely).ⓘ Factor of Safety in Pile Foundation [F_s]			+10% -10%

✖Allowable Load is the maximum working load that can be applied on the structure.ⓘ Allowable Load for given Safety Factor [P_allow]

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Formula

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Allowable Load for given Safety Factor

Formula

P allow = \frac{Q su + Q bu}{F s}

Example

10 kN = \frac{17.77 kN + 10.23 kN}{2.8}

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Allowable Load for given Safety Factor Solution

STEP 0: Pre-Calculation Summary

Formula Used

Allowable Load = (Shaft Resistance+Toe Resistance)/Factor of Safety in Pile Foundation
P_allow = (Q _su+Q _bu)/F_s
This formula uses 4 Variables

Variables Used

Allowable Load - (Measured in Newton) - Allowable Load is the maximum working load that can be applied on the structure.
Shaft Resistance - (Measured in Newton) - Shaft Resistance is the load-bearing capacity of deep foundations such as piles or drilled shafts, derived from the frictional resistance along the sides of the shaft.
Toe Resistance - (Measured in Newton) - Toe Resistance is the capacity of the soil at the base or toe of a structure (such as a retaining wall, foundation, or slope) to resist sliding or overturning.
Factor of Safety in Pile Foundation - Factor of Safety in Pile Foundation is the ratio of the ultimate capacity of the pile to the working load (the load the pile is designed to carry safely).

STEP 1: Convert Input(s) to Base Unit

Shaft Resistance: 17.77 Kilonewton --> 17770 Newton (Check conversion here)
Toe Resistance: 10.23 Kilonewton --> 10230 Newton (Check conversion here)
Factor of Safety in Pile Foundation: 2.8 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

P_allow = (Q _su+Q _bu)/F_s --> (17770+10230)/2.8

Evaluating ... ...

P_allow = 10000

STEP 3: Convert Result to Output's Unit

10000 Newton -->10 Kilonewton (Check conversion here)

FINAL ANSWER

10 Kilonewton <-- Allowable Load

(Calculation completed in 00.004 seconds)

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Home » Engineering » Civil » Geotechnical Engineering » Pile Foundations » Axial Load Capacity of Single Piles » Allowable Load for given Safety Factor

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Created by Alithea Fernandes

Don Bosco College of Engineering (DBCE), Goa

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National Institute Of Technology (NIT), Hamirpur

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< Axial Load Capacity of Single Piles Calculators

Allowable Load using Safety Factors

Go Allowable Load = (Shaft Resistance/Factor of Safety F1)+(Toe Resistance/Factor of Safety F2)

Shaft Resistance using Allowable Load and Safety Factor

Go Shaft Resistance = (Factor of Safety in Pile Foundation*Allowable Load)-Toe Resistance

Allowable Load for given Safety Factor

Go Allowable Load = (Shaft Resistance+Toe Resistance)/Factor of Safety in Pile Foundation

Pile Capacity

Go Pile Capacity = Shaft Resistance+Toe Resistance

Allowable Load for given Safety Factor Formula

Allowable Load = (Shaft Resistance+Toe Resistance)/Factor of Safety in Pile Foundation
P_allow = (Q _su+Q _bu)/F_s

What is Factor of Safety?

In engineering, a Factor of Safety (FoS), also known as (and used interchangeably with) safety factor (SF), expresses how much stronger a system is than it needs to be for an intended load. Safety factors are often calculated using detailed analysis because comprehensive testing is impractical on many projects, such as bridges and buildings, but the structure's ability to carry a load must be determined to a reasonable accuracy.

How to Calculate Allowable Load for given Safety Factor?

Allowable Load for given Safety Factor calculator uses Allowable Load = (Shaft Resistance+Toe Resistance)/Factor of Safety in Pile Foundation to calculate the Allowable Load, The Allowable Load for given Safety Factor formula is defined as the maximum working load that can be applied on the pile. Allowable Load is denoted by P_allow symbol.

How to calculate Allowable Load for given Safety Factor using this online calculator? To use this online calculator for Allowable Load for given Safety Factor, enter Shaft Resistance (Q _su), Toe Resistance (Q _bu) & Factor of Safety in Pile Foundation (F_s) and hit the calculate button. Here is how the Allowable Load for given Safety Factor calculation can be explained with given input values -> 0.007457 = (17770+10230)/2.8.

FAQ

What is Allowable Load for given Safety Factor?

The Allowable Load for given Safety Factor formula is defined as the maximum working load that can be applied on the pile and is represented as P_allow = (Q _su+Q _bu)/F_s or Allowable Load = (Shaft Resistance+Toe Resistance)/Factor of Safety in Pile Foundation. Shaft Resistance is the load-bearing capacity of deep foundations such as piles or drilled shafts, derived from the frictional resistance along the sides of the shaft, Toe Resistance is the capacity of the soil at the base or toe of a structure (such as a retaining wall, foundation, or slope) to resist sliding or overturning & Factor of Safety in Pile Foundation is the ratio of the ultimate capacity of the pile to the working load (the load the pile is designed to carry safely).

How to calculate Allowable Load for given Safety Factor?

The Allowable Load for given Safety Factor formula is defined as the maximum working load that can be applied on the pile is calculated using Allowable Load = (Shaft Resistance+Toe Resistance)/Factor of Safety in Pile Foundation. To calculate Allowable Load for given Safety Factor, you need Shaft Resistance (Q _su), Toe Resistance (Q _bu) & Factor of Safety in Pile Foundation (F_s). With our tool, you need to enter the respective value for Shaft Resistance, Toe Resistance & Factor of Safety in Pile Foundation and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Allowable Load?

In this formula, Allowable Load uses Shaft Resistance, Toe Resistance & Factor of Safety in Pile Foundation. We can use 1 other way(s) to calculate the same, which is/are as follows -

Allowable Load = (Shaft Resistance/Factor of Safety F1)+(Toe Resistance/Factor of Safety F2)

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