Accessing CyberShake Duration Data

This page details how to access CyberShake duration data.

Duration data is a relatively new addition to the CyberShake codebase, starting with Study 15.12.

Types of duration data

In CyberShake, we calculate the following duration metrics, independently for the X and Y components:

• Energy integral (integral of the velocity squared)
• Signification durations for 5-75%, 5-95%, and 20-80% for velocity
• Arias intensity (pi/2g times the integral of the acceleration squared)
• Signification durations for 5-75%, 5-95%, and 20-80% for acceleration
• Cumulative absolute velocity (CAV) (integral of the absolute value of the acceleration).

A reference document for these formulas is available here: File:durationMetrics.docx.

Accessing database data

We have only populated the database for Study 15.12. For Study 17.3, duration data is only available on the filesystem.

For Study 15.12, the database contains duration data for the metrics that users requested quick access to. For both the X and Y component

• Significant duration, 5-75%, velocity
• Significant duration, 5-95%, velocity
• Significant duration, 5-75%, acceleration
• Significant duration, 5-95%, acceleration