|
The Padding tool increases the duration of a ground motion record by adding extra points at the beginning or end. This is useful when records need to be aligned, extended, or prepared for analysis tools requiring a minimum duration.
You can specify the padding length in two ways:
•Time – Define the duration to add (in seconds). The number of points added is automatically calculated as: points added = time (s) × samples per second
•Number of Points – Directly specify the exact number of points to add.
The added values are typically zeros, ensuring the signal is extended without altering its original content.
The figure below presents an example of padding operation. A padding duration of 20 seconds is added at the start of the "B-ICC" record. As a result, the ground motion time-history is shifted forward in time by 20 seconds. QuakeManager automatically track of this shift, and users can control the display in chart toolbar options: “Shift Padding” & “Show Padding”.
.png)
Figure: Padding dialog
.png)
Figure: Original and padded B-ICC record acceleration time-history (without shift padding)
.png)
Figure: Original and padded B-ICC record acceleration time-history (with shift padding)
|