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minimum length of the pile

minimum length of the pile

Structural Analysis
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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(a) A 500 mm diameter bored pile is to be designed to support a safe vertical load of 25P kN. Where P = 8. The factor of safety is 2.5 and it is to be applied to the ultimate load. The succession of strata is 2 m of loose fill overlying firm, becoming stiff clay with depth. No side friction is to be allowed in the fill. For the clay the undrained cohesion cu (kPa) = 3z+40, where z is the depth in metres below ground level. %3D Calculate the minimum length of the pile required to support the load. Take a = 0.4, and Nc = 9. %3D (b) A pile weighing 8P kN has been proposed to be driven down into three layers of different materials as shown in Figure Q2, to support a structural load from a proposed building project. Where P = 8. Calculate the number of piles needed to support an ultimate structural load of Qu MN. Where Qu is the last two digits of your students' identification number (SID). For pile in cohesionless soil, assume o = 4'.
Transcribed Image Text:(a) A 500 mm diameter bored pile is to be designed to support a safe vertical load of 25P kN. Where P = 8. The factor of safety is 2.5 and it is to be applied to the ultimate load. The succession of strata is 2 m of loose fill overlying firm, becoming stiff clay with depth. No side friction is to be allowed in the fill. For the clay the undrained cohesion cu (kPa) = 3z+40, where z is the depth in metres below ground level. %3D Calculate the minimum length of the pile required to support the load. Take a = 0.4, and Nc = 9. %3D (b) A pile weighing 8P kN has been proposed to be driven down into three layers of different materials as shown in Figure Q2, to support a structural load from a proposed building project. Where P = 8. Calculate the number of piles needed to support an ultimate structural load of Qu MN. Where Qu is the last two digits of your students' identification number (SID). For pile in cohesionless soil, assume o = 4'.
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Verticle load is 258 kN as opposed to 25*8kN - Apologies 

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