This paper summarizes progress on research at the Center for Advanced Technology for Large Structural Systems (A TLSS) on gravity load floor systems for precast/prestressed concrete buildings. The main objective of the research is to develop precast/ prestressed concrete floor systems for gravity loads for application in occupied office buildings with a regular spacing of columns. Five proposed concepts for precast/ prestressed structural floor framing systems that are suitable for office building construction are presented. The concepts were developed ba sed on previous research that included a review and assessment of existing precast/prestressed concrete floor framing systems and an identification of opportunities for the development of new precast structural systems. The proposed systems differ in relative amounts of prefabrication vs. field work, and in the manner in which the service and architectural systems are accommodated.
