Pratt Truss (image) University of Miami Share Print E-Mail 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. Share Print E-Mail 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.