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Young's Modulus - 🧠 ANSWER ✔✔E
modulus of elasticity
How much does something compress - 🧠 ANSWER ✔✔strain =
compression
Δ = change in compression
Δ =PL/AE
γ
c
ф
(Geotechnical) - 🧠 ANSWER ✔✔Unit weight
cohesion
,angel of internal friction
bearing capacity - 🧠 ANSWER ✔✔use ultimate bearing capacity equation
then divide by factor of safety
cohesion value for sand - 🧠 ANSWER ✔✔zero
Pressure at bottom of a wall
(fluids) - 🧠 ANSWER ✔✔(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 - 🧠 ANSWER ✔✔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 - 🧠 ANSWER ✔✔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)
log b - log a also equals - 🧠 ANSWER ✔✔log(b/a)
Secant Modulus - 🧠 ANSWER ✔✔Between origin and any "arbitrary" point
on the curve
Cord Modulus - 🧠 ANSWER ✔✔Between any two points
Tangent Modulus - 🧠 ANSWER ✔✔At one "arbitrary" point on the curve
Modulus of Elasticity of Steel - 🧠 ANSWER ✔✔29,000 ksi
Modulus of Elasticity of Aluminum - 🧠 ANSWER ✔✔10,000-11,000 ksi
Modulus of Elasticity of Concrete - 🧠 ANSWER ✔✔2,000-6,000 ksi
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