A Fundamental Engineer's Definition for Collapse Efficiency and Safety Factor For any Engineered Support Structure from Skyscrapers to Bridges to multi-story Edifices

A simple description of the basic Engineering Collapse Efficiency and Safety Factoras applies to any support structure like a Twin Tower or WTC-7.

Collapse Load/ Live Load

is the mathematical long established definition for total support structure Collapse efficiency or Safety Factor based of the total building or structure, not individual floors as NIST and mass media supporters would have you believe.

Most people believe about anything the USA Government tells them. That goes for the Mass Media BS also.