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Pile seismic inertial forces for bridges 1
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Portions of foundations located below grade do not contribute to seismic base shear. This is because they move with the ground and as a result, there is no acceleration of the foundation relative to the ground. So if A = 0, F = ma = 0. For structures located above ground, they will sway at a period and acceleration different from the ground. Think of it as the structure above ground is always trying to catch up to the motion of the ground.
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