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:

• Energy integral (integral of the velocity squared)
• Time to go from 5-75%, 5-95%, and 20-80% of maximum velocity
• Arias intensity (pi/2g times the integral of the acceleration squared)
• Time to go from 5-75%, 5-95%, and 20-80% of maximum 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

The database contains duration data for the most useful metrics.