Answered: Find the change in vertical stress at…

Find the change in vertical stress at level 3m below the base of footing at Point A. It is to be assumed the thickness of both footings are the same.

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

Find the change in vertical stress at level 3m below the base of footing at Point A. It is to be assumed the thickness of both footings are the same.

L₁ = 2.5m

L₂ = 1.5m

L₃ = 4m

L₄ = 6m

L₅ = 7m

L1
L1
L2
L2
A
9₁ = 90 kPa
L3
L4
9₂ = 120 kPa
L5

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Step 1: Calculation of change in vertical stress 3m below under point A

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