Prestressed Roof Plank Design Example

The design is in accordance with as 3600.

Prestressed roof plank design example.

Where voids stairs and other features prevent the slabs from spanning between walls slabs spanning perpendicularly are provided supported by the. 3 6 a floor system alternate 1 prestressed plank and half slab floor system this precast floor system refer to figure 3 12 comprises prestressed planks spanning between load bearing walls. In spancrete hollowcore plank such loads may be distributed over several slabs. Ultra span is a machine extruded precast prestressed hollowcore plank.

The floors and roofs of these buildings are to be untopped 8 inch thick hollow core precast prestressed concrete plank. Design steel plank support headers at openings when headers are determined necessary by the manufacturer s engineer. Our product options give you the design flexibility you need while reducing your lead time. General after making an initial selection of the slab thickness the second step in slab design is to determine the amount and distribution of prestress.

Primarily used for floors and roof decks hollow core is a precast slab of prestressed concrete designed for greater structural efficiency. Prestressed concrete is a form of concrete used in construction. The plank is manufactured on 500 foot long beds in a standard width of 48 inches and thicknesses of 8 10 and 12 inches. Load balancing is used a portion of the load on slab is balanced by the transverse forces imposed by the draped tendons in each direction.

Spancrete hollowcore plank has been used for more than one billion square feet of floor and roof construction worldwide. The example in section 10 2 provides design parameters used in this example. Design calculations shall be performed by an engineer registered in the state that the project is located in and be experienced in precast prestressed concrete design. It is substantially prestressed during production in a manner that strengthens it against tensile forces which will exist when in service.

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. Plank is cut to length for each project. Molin concrete offers two types of hollow core plank. High strength prestressing strands are cast into the plank at the spacing and.

Figure 10 2 1 shows the typical floor plan of the diaphragms. For double tees such distribution of loads is a special design consideration and our engineering department should be consulted for more information. It is the most economical way to obtain long spans with minimal depth and a capacity for heavy loads. Precast prestressed hollowcore plank for floors and roofs.

8 1 1 1 general design requirements.