Prestressed Concrete Roof Structures

3 5 this compression is produced by the tensioning of high strength tendons located within or adjacent to the concrete and is done to improve the performance of the concrete in service.

Prestressed concrete roof structures.

For illustration four architecturally most successful roofs are discussed. It is substantially prestressed during production in a manner that strengthens it against tensile forces which will exist when in service. Prestressed concrete is a combination of high strength concrete and steel strands. Precast prestressed concrete trusses were introduced in 1978 in the aci journal article titled prestressed concrete trusses.

Prototype i that had a clear span of 6 1 m 20 3 ft and a depth of 0 6 m 2 ft for a span to depth ratio of 10 and prototype ii that had a clear span of 18 4 m 60 8 ft and a depth of 2 6 m 8 5 ft for a span to depth. This combination makes a very strong structural material that is used in the building of roof slabs bridge girders and railroad ties. Prestressed membrane roofs have been designed since the invention of prestressed concrete. Concrete roof systems have three basic advantages over competitive materials esthetic appeal structural economy and functional utility.

The article discussed two prototypes. Prestressed concrete is a form of concrete used in construction. Double tees are the most widely used prestressed concrete product in the minimum span range. Prestressed concrete was invented and patented in 1886 by henry jackson a san.