A 2m wide strip footing is placed at 1m below the ground surface of a clay soil having the following properties: cu= 80 kN/m², c'-0, qu=0, p=30, unit weight above the water table=20 kN/m³, saturated unit weight = 20 kN/m². i) If the water table is at foundation level, calculate the net safe bearing capacity of the footing using factor of safety of 2, for short term and long term conditions. ii) Also indicate the change that may occur in the short term value when the water table rises to ground level.

A 2m wide strip footing is placed at 1m below the ground surface of a clay soil having the following properties: cu= 80 kN/m², c'-0, qu=0, p=30, unit weight above the water table=20 kN/m³, saturated unit weight = 20 kN/m². i) If the water table is at foundation level, calculate the net safe bearing capacity of the footing using factor of safety of 2, for short term and long term conditions. ii) Also indicate the change that may occur in the short term value when the water table rises to ground level.

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

H.W.2
A 2m wide strip footing is placed at 1m below the ground surface of a clay soil having the
following properties: cu= 80 kN/m², c²-0, qu=0, p'=30, unit weight above the water table=20
kN/m³, saturated unit weight = 20 kN/m².
i) If the water table is at foundation level, calculate the net safe bearing capacity of the footing
using factor of safety of 2, for short term and long term conditions.
ii) Also indicate the change that may occur in the short term value when the water table rises
to ground level.

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