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Precast Design & Engineering Resources for Building Designs | Spancrete (855) 900-SPAN Locations Careers News Menu Search Search Searcharrow_backHome Why Spancrete Overview Preconstruction Services SpanCare Our Team Community Involvement Projects Projects Commercial Industrial Education Entertainment Complexes Government Parking Multi-Family Residential Single Family Home Transportation and Infrastructure View all Projects Precast Products Overview Total Precast Architectural Hollowcore Wall Panels Double Tees Beams & Columns Transportation Stairs & Risers RibSlab Flooring RePlenish Resources Overview Literature Precast Design & Engineering Handbook Contact Locations Careers News Back to Resources Home Resources Precast Design & Engineering Handbook Precast Design & Engineering Handbook Welcome to the Spancrete Design and Engineering Handbook. This handbook is organized around the precast concrete products available from Spancrete. Generally, load tables, details and guide specifications are provided for each product. PRODUCT CATEGORIES View and download specifications, details, and load tables for all of our products. Architectural Designed structural elements intended to provide design flexibility and durability. View Architectural Beams & Columns Foundational pieces that can enhance building strength and aesthetic. View Beams & Columns Double Tees Pretopped and standard beams used for applications requiring long, clear spans. View Double Tees Hollowcore Precast concrete slabs used for roofing and flooring. View Hollowcore Wall Panels Quick to install panels for interior or exterior walls allowing for design customization. View Wall Panels RibSlab Flooring A floor system that is light, strong and more energy efficient. View RibSlab Flooring Some of the data in the handbook is based on industry norms or specific conditions. Below are those unstated conditions that have been applied throughout the handbook. LOAD TABLES Load tables are provided for Spancrete hollowcore plank, beams and double tees. The load tables present the superimposed live load capacity of the various members at various spans. The basis of the load capacities is ACI 318-05 which is the reference document for the 2006 International Building Code (IBC). The material properties used are 6000 psi concrete in the precast element and either 250 ksi or 270 ksi prestressing strands. For the beams and double tees, the capacities are somewhat independent of the available fire rating. However, for the Spancrete hollowcore plank, the fire endurance provided will have an effect on load capacity. For the Spancrete hollowcore plank and the double tees, specific prestressing strand patterns are provided for the corresponding load capacities. Cambers are also identified for these strand patterns. Beam load charts simply provide the range of load capacities available for a given cross-section. For any of the load tables, if the user’s case is at the extreme upper end of the table, it may be more economical to consider the next deeper section as the addition of concrete may be more than offset by a reduction in prestressing strand required. FIRE RATINGS To properly use the Spancrete hollowcore plank load tables, the required fire endurance should be known. This will be established from the building code occupancy and limitations requirements. The fire ratings that can be provided are based on the prescriptive provisions of the 2006 IBC. Three criteria must be considered in determining the available fire resistance. The first is heat transmission. Sufficient concrete thickness must be provided to limit the temperature rise on the top of the slab. The second criterion is structural endpoint. That is, at the elevated temperatures in a fire, sufficient strength must remain in the slab to prevent collapse at the endurance time. This criterion is satisfied by using the correct amount of concrete cover under the prestressing strands to limit the temperature to which the strands will be exposed. Finally, the span must be defined as either restrained or unrestrained. For a given concrete cover over the prestressing strands, a longer fire endurance will be achieved in a restrained condition. A restrained span is one where expansion due to elevated temperatures is prevented. Conversely, in the unrestrained condition, expansion is not limited. ASTM E119 provides guidance on restrained and unrestrained assemblies. Generally, interior bays are considered restrained and end bays are considered unrestrained. TOPPING Where indicated in Spancrete hollowcore plank or double tee load tables, a 2 inch thick, 4000 psi bonded structural concrete topping has been included as part of the structural element for calculation of load capacity. The topping thickness is measured at midspan of the piece. An adjustment of planned topping thickness should be made for the anticipated camber. Please reference the Span Notes discussing ‘Topping’ under the Research” heading for further information. LOAD DISTRIBUTION When non-uniform loads such as bearing wall or post loads are applied, special considerations are necessary for using the load tables. In Spancrete hollowcore plank, such loads may be distributed over several slabs. Please see the appropriate design information in the Research Notes under the Research” heading. For double tees, such distribution of loads is a special design consideration and our engineering department should be consulted for more information. ACOUSTICAL PROPERTIES Spancrete hollowcore slabs were tested for Sound Transmission Class (STC) and Impact Insulation Class (IIC). The following values are provided: ASSEMBLY STC 6” Spancrete 50 6” Spancrete + 2” NWT Topping 51 8” Spancrete 56 8” Spancrete + 2” NWT Topping 59 IMPACT INSULATION CLASS (IIC) ASSEMBLY 8” SPANCRETE 8” SPANCRETE + 2” TOPPING Impact on Concrete Direct 26 31 Impact on 0.058” Vinyl Tile 48 50 Impact on 40 oz. Wool Carpet + 50 oz. Hair Pad 74 84 Impact on Shag Carpet + Foam Rubber Pad 76 89 Additional information on acoustic properties can be found in the PCI Design Handbook. R-VALUES FOR SPANCRETE WALL PANELS Spancrete insulated wall panel construction provides insulating values that effectively reduce heating and cooling losses through walls, resulting in increased energy savings and greater cost efficiency over the life of the building. Spancrete Wall Panels can be manufactured in a variety of sizes and finishes. The structural withes are typically 6”, 8” or 10” (10cm, 20cm or 25cm) thick with the insulation being 2”, 3” or 4” (5cm, 7.5cm or 10cm) thick. 8” SPANCRETE WITH 2” FACING INSULATION THICKNESS Type of Insulation 2" R U 3" R U 4" R U Extruded Polystyrene 1 R = 5 in 12.44 0.080 17.44 0.057 22.44 0.044 Poly-isocyanurate 2 LTTR = 6.1 in 13.94 0.071 19.69 0.051 25.44 0.039 Wall Panels used in freezer/cooler applications are available with insulation thicknesses up to 4” (10cm). ¹Extruded Polystyrene: Values shown are averaged aged values tested at mean 75 deg F per ASTM C578. ²Poly-isocyanurate: Long Term Thermal Resistance (LTTR) is the 15 year time-weighted average R-value per ASTM C1289. Load Tables Beams & Columns Rectangular Beams Inverted Tee Beams (Spancrete) Inverted Tee Beams (Double Tees) Spancrete Hollowcore Plank Ultralight Standard Load Table Booklets Double Tees DETAILS Architectural Composite Freezer Non-Composite Solid Beams & Columns Spancrete Hollowcore Plank Spancrete Wall Panels Double Tees SPECIFICATIONS Architectural Precast Structural Precast Structural with Commercial Finish Spancrete Wall Panel Spancrete Hollowcore Plank Additional Resources CarbonCast Enclosure Systems’ Technical Resources PCI Design Resources Corporate Headquarters N16 W23415 Stoneridge Drive Waukesha WI 53188 United States Mailing Address P.O. Box 828 Waukesha WI 53187 United States Contact Us Phone (414) 290-9000 (855) 900-SPAN Fax (414) 290-9130 Contact Us Spancrete...