When the first lattice spans appeared in events in 1970s, people just describe a truss as follows: A modular structural element made of aluminum tubes welded to each other used to support stage lighting and audio equipment in events.
The development of truss we know today began at the end of 1970s when people were searching for a simple and efficient means of light but safe supporting structures.
And an idea came cross to the designers about spatial structures employed in bridge construction to develop today's trusses.
Both bearing capacity and other practical consideration are important when developing trusses.
A truss is usually defined as:
1. Made from welded round tubes
2. Composed of modular coupled parts
3. Manufactured in several standard lengths
4. Used to support equipment in the entertainment industry