Pratt Truss (IMAGE) University of Miami Caption This is a pratt truss structural system for Functional Unit 2 (3 bays or units). Credit With permission from ASCE Usage Restrictions Must be used with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.