Prestressed Roof Plank Design Example

Figure 10 2 1 shows the typical floor plan of the diaphragms.

Prestressed roof plank design example.

Example 1 calculate m sr for the 203 mm deep prestressed hcu shown below. Ultra span is a machine extruded precast prestressed hollowcore plank. 8 1 1 1 general design requirements. Please see the appropriate design information in the research notes under the research heading.

Take the final long term losses as 24. This article deals with the design of prestressed precast elements with pretensioned tendons according to ec2. A c 135 2103 mm2 i 678 106 mm4 y t 99 mm f ck. The initial prestressing force may be taken as 70 of characteristics strength of the standard 7 wire helical strand.

Prestressed solid composite planks comprises a wet cast prestressed concrete element combined with insitu concrete structural topping to give an overall solid composite slab. High strength prestressing strands are cast into the plank at the spacing and. 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. Some of the images and calculations included in this article were taken from the worked example of prestressed concrete girders according to eurocode 2 published by the fachvereinigung deutscher betonfertigteilbau e.

For double tees such distribution of loads is a special design consideration and our engineering department should be consulted for more information. Where voids stairs and other features prevent the slabs from spanning between walls slabs spanning perpendicularly are provided supported by the. Plank is cut to length for each project. 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.

Instructional material complementing fema 752 design examples precast concrete 5. The example in section 8 4 shows a partial example for the design of a special moment frame constructed using precast concrete per aci 318 section 21 8. The design is in accordance with as 3600. The example in section 10 2 provides design parameters used in this example.

In spancrete hollowcore plank such loads may be distributed over several slabs. The plank is manufactured on 500 foot long beds in a standard width of 48 inches and thicknesses of 8 10 and 12 inches. Geometric and data given by the manufacturer are as follows. 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.

Prestressed solid composite planks.