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Unformatted text preview: accelerometers. The velocity is then converted to force units by multiplying by the pile’s impedance (Z). The result of the force and velocity are then plotted in a graph versus time for a given blow. Figure 3-2 shows an example of the force and velocity traces for a given hammer blow.-1000-500 500 1000 1500 2000 2500 0.01 0.02 0.03 0.04 0.05 0.06 Time (s) Force Velocity Figure 3-2. Typical Force and Velocity Traces from PDA The main equation used by PDA to determine the static capacity of piles was derived assuming that the pile is linearly elastic and has constant cross section properties along the length. This equation is based on the force and velocity records at a time T 1 and at a time T 2 equal to T 1 plus 2L/c, and the Case damping constant. Equation 3-14...
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- Spring '11
- Derivative, Physical quantities, Fundamental physics concepts, pile, elastic modulus