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Summary FE Exam latest review 2024

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FE Exam latest review 2024

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FE Exam latest review 2024
Young's Modulus - E

modulus of elasticity



How much does something compress - strain = compression

Δ = change in compression

Δ =PL/AE



γ

c

ф

(Geotechnical) - Unit weight

cohesion

angel of internal friction



bearing capacity - use ultimate bearing capacity equation then divide by factor of
safety



cohesion value for sand - zero

,FE Exam latest review 2024
Pressure at bottom of a wall

(fluids) - (fluids) unit weight x h



(geotech) Ka(unit weight x h)



Ka = active earth pressure



ρ = Ka(γxh)

P = 1/2(ρxh) for triangular pressure point load

overturning moment = P(h/3)



Determine factor of safety of a retaining wall resisting earth. Wall has a moment
6000 ft-lbs& earth is acting in the opposite direction to overturn the wall with
3146 ft-lbs - moment of wall/moment of earth = factor of safety



If factor of safety isn't enough, need a bigger wall



Active earth pressure vs Passive earth pressure - Active: trying to overturn the wall

Passive: trying to resist active (don't have to worry about if wall is level with earth,
not embedded)

, FE Exam latest review 2024

log b - log a also equals - log(b/a)



Secant Modulus - Between origin and any "arbitrary" point on the curve



Cord Modulus - Between any two points



Tangent Modulus - At one "arbitrary" point on the curve



Modulus of Elasticity of Steel - 29,000 ksi



Modulus of Elasticity of Aluminum - 10,000-11,000 ksi



Modulus of Elasticity of Concrete - 2,000-6,000 ksi



Modulus of Elasticity of Wood - 900-2,200 ksi



Poisson's Ratio - Relates lateral and axial strain

εl/εa

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