Ray Delaforce
PV Elite Senior Support Engineer

Seismic Design, Part 2: Damping

In last month’s newsletter, we discussed the basis for seismic design and how an earthquake does not deliver constant force (acceleration). An actual earthquake acts in this manner:

Vol.3 | December 2016 | Issue 12
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You can select the 3D model view options through the 3D Ribbon menu or by right-clicking the 3D view tab.
You can compute the ASME VIII-1 UG-53.x or 4.10.x ligament efficiencies for tube spacing.

Simply open the ASME VIII-1 UG-53 Ligament Efficiency Scratch Pad dialog box found in the Tools Ribbon menu.

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This complicates things. Everything is moving in a chaotic fashion. We have a further complication because the tower has its own natural frequency of vibration. If we consider the basic equation of natural frequency and put our equation f = m x a in a more formal setting, it looks like this:

Notice the 0 on the right, which indicates there is no force providing energy to the tower.