Wave Mechanics

Question 1

What is the Proportionality Equation?

Answer 1

F=VZ=V(EA/C), Expressed in Stress: θ=v(E/c) and ε=v/C

Question 2

What Does CAPWAP Stand For?

Answer 2

CAse Pile Wave Analysis Program

Question 3

Stroke Height Equation

Answer 3

STK=(G/8)T^2-H where G=32.2 ft/sec^2, T=time between impact strikes, H=0.3 ft

Question 4

Define CSI and Its Implication

Answer 4

Max strain in sensor set, Indicates: uneven loading of the pile top and measure of bending in the plane of the strain gauge.

Question 5

In Wave Mechanics, What is Impedance, Z, comprised of?

Answer 5

Z=EA/c, influenced by cross sectional area and qualities of pile material (E, ρ, c)

Question 6

Wave Speed Determination:

1) What is the equation for Wave speed?
2) What relates Wave Speed to Pile Material?
3) How do you determine Elastic Modulus of Non-uniform Pile?

Answer 6

1) C=(2L/T) Stress wave Speed
2) Linear Elastic Wave Equation Theory Relates Pile material and Wave Speed: E=C^2*ρ
3) Measure Wave speed in the field and calculate E

Question 7

Provide 3 Forms for Pile Impedance, Z

Answer 7

Z = EA/c = ρcA = A√(Eρ) where A=in^2, E=ksi, c=in/sec ρ=ibs/ft^3