What is zero period acceleration in the response spectrum of seismic analysis?
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Zero period Acceleration (ZPA) refers to the spectral acceleration of the zero-time period structure under earthquake excitation. In other words, the zero-time period structure means the structure has a very high natural frequency (i.e. f=1/T). Since natural frequency is proportional to
the structure having very high stiffness or a rigid structure will have a high natural frequency. ZPA has the value same as ground acceleration because if the structure is rigid, it will accelerate with the same magnitude of excitation acceleration.