General Notes for Awnings
- Head of awning supported on building where applicable.
- All pipe to be as a standard weight schedule 40 A –53 Type E, Grade A; Allied’s “Gatorshield” steel tube, Allied’s “Gatorshield” square tube. See design information for specific size and wall thickness.
- All welds to comply with A.W.S. Code, D1.1; latest edition. Frame members hall be welded to each other in such a way as to develop the full strength of the members joined.
- A weld connecting two tubes end to end shall be a butt weld.
- A weld connecting the end of one tube (branch tube) to the surface of another (main tube), with the axis of the tubes intersecting at an angle of not less than 30 degrees, shall be either:
- A butt weld throughout, can be used regardless of the diameters of the tubes joined, provided complete penetration is secured either by the use of backing material or by depositing a sealing run of metal on the back of the joint.
- A fillet weld throughout, used where the diameter of the branch tube is less that 1/3 of the diameter of the main tube.
- A fillet weld in one part and a butt weld in another with a continuous transition change from one form to the other. Used where the diameter of the branch tube is equal to or greater than 1/3 of the diameter of the main tube.
- The stress in a butt weld shall be calculated on an area equal to the throat thickness multiplied by the effective length of the weld, measured at the center of its thickness.
- The stress in a fillet weld or a fillet butt weld shall be calculated on an area equal to the throat thickness of the crotch multiplied by the length of the weld.
- The allowable tensile, compressive or shear stresses in a butt weld shall not exceed the tensile, compressive or shear stress, respectively permissible in the pipes or tubes used, or in the parent metal, whichever is the lesser.
- Cover weld with corrosive resistant coating.
- All framework is assumed to be covered with awning fabric which transmits the imposed loads to the frame. The fabric shall be properly attached to each appropriate member.
- It shall be the responsibility of the designer to determine which load set if any, is applicable to the particular project.
- In case of conflict between two or more members, the strongest one governs. Main members shall always be of thicker wall sections than other members welded to them.
- See frame anchorage detail attachment methods and allowable working load capabilities.
- For truss design, be certain loads are applied only at pipe connections.
- Where required by local code or other regulations, the canvas shall be labeled in a visible place with the following information: canvas shall be removed when winds reach maximum whole gale force or apply a force of 10 pounds per square foot or wind speeds reach 70 mph.
- Awnings placed in a position to shade environmental, tinted or reflective glass, may cause thermal shock and glass breakage if the shadow cast over the glass is 1/4 to 1/2 of the glass area.