BUILDING PRODUCTS
Floor systems, beams and architectural components.
Compare Double Tee, Dynacore, Prestressed Plank, Beams & Soffits, and project-specific products. Our team can assist with product, detail and connection designs based on the loading requirements provided by the engineer of record.
Design guidance & published assumptions
The following information preserves the original product design guidance and its referenced standards. Project requirements and final design must be coordinated with GPRM and the engineer of record.
The product and design information contained herein are provided for general design assistance and preliminary product sizing. Complete calculations and details, including custom solutions shall be provided to meet project specific requirements.
The Load/Span tables have been developed to show general product performance and should be interpreted using sound engineering judgement.
Refer to “Choosing and Planning a Floor System” for additional information on the use of our products.
DESIGN
The design of precast building products is usually the responsibility of the manufacturer.
GPRM Prestress will provide the product, detail, and connection designs to the loading requirements provided by the Engineer of Record.
Load/Span tables are based on ACI 318-05 and applicable PCI recommendations.
Product may or may not be shored during construction. Typically, the more shallow sections, e.g. prestressed plank may require shoring. The deeper “stemmed” sections, e.g. double tees, do not.
General design parameters:
- Strand. ½”. 270k low relaxation
- Concrete. 6000 psi @ 28 days. 4000 psi @ release.
- Topping. 4000 psi @ 28 days.
- A 2 ½” composite topping slab is used in the analysis.
- Simply supported spans are assumed.
- A super-imposed dead load of 15psf is used in the analysis. The live load capacity is in addition to this load.
- Dead load includes product and topping slab.
Load/Span combinations outside the tables can be achieved with specific design and detailing considerations.
Special load conditions, bearing details etc. can be accommodated with project specific solutions.
