| |
PART 2 PRODUCTS
2.1 MANUFACTURER
- RPS Engineering, Inc. of Elgin, Illinois, (800) 931-1950; approved other.
2.2 GENERAL REQUIREMENTS
- The structure is a fully triangulated space frame comprised of aluminum struts connected with aluminum gusset plates. Aluminum closure panels are securely attached to the frame members/struts by batten bars, creating a spherical surface.
- The dome is a clear-span structure attached to, and supported by, the tank at mounting points, quantity of which is dependent on dome diameter and is specified by the mfg.
- The dome surface shall be designed as a watertight system under all specified loads and temperature conditions. All raw edges of the aluminum panels shall be covered, sealed and firmly secured with batten bars in an interlocking manner to prevent disengagement under all load and temperature changes. Batten bar, panel and gusset cover-panel joints shall be sealed with an extruded one-piece integral seal.
- The dome frame system shall be designed as a three-dimensional truss with moment-resisting joints.
- Connection forces shall be transferred through gusset plates connected to the top and bottom flanges of the struts. The connections shall be designed as moment connections; a minimum of four bolts shall be used to connect the gusset plate to each strut flange.
- Dissimilar materials, which are not compatible, shall be physically separated or insulated by gaskets or insulating compounds.
- All gasket material shall be continuous; splices will not be allowed. No sealant is to be used to provide an exterior or primary seal.
2.3 DESIGN REQUIREMENTS
- Aluminum Association Specifications for Aluminum Structures shall be the reference standard for determining allowable loads and stress limitations for the aluminum cover. Specify the following loading criteria:
- Live Load: (specify psf)
- Snow Load: (specify psf)
- Wind Load: (specify psf) (specify method)
- Seismic Zone, Design Response Spectrum, Importance Factor
- Cover panels designed to sustain each load:
- Uniform Loads: 60 psf maximum over the total panel.
- Concentrated Load: 2 @ 250 lbs each, simultaneously on two separate 1 sq. ft. areas of the panel.
- ASCE 8-90 gives safety factors for stainless steel bolts and anchors.
- ASTM F593 gives minimum strength of material for stainless steel bolts and anchors.
- Design the cover for thermal expansion and contraction over the ambient temperature of range of -30° F to +140° F.
2.4 MATERIALS
- Extrusions (Struts): 6061-T6, 6063-T52, 6005A-T6
- Plate (Gussets): 6061-T6, 6005A-T6; 0.375" min. material thickness
- Sheet (Panels): 3003-H6; 0.050" nominal material thickness
- Composite (Skylight): Clear acrylic composite, 0.50" min. material thickness
- Fasteners: 316 Series Stainless Steel or 7075-T73 anodized
- Anchors: 316 Series Stainless Steel
- Hardware: 300 Series Stainless Steel
- Gaskets: EPDM or equal
- Sealant: Silicone by Pecora, General Electric Silpruf or equal
2.5 ACCESSORIES
- Dormers, Doors, Hatches, Vents, Flanged Connections: 3003-H6, 6061-T6, 6005A-T6
|
|
