Portal Frame Roof Detail

2 3 portal frame with lean to 3 2 4 crane portal frame with column brackets 4 2 5 mono pitch portal frame 4 2 6 propped portal frame 5 2 7 tied portal frame 6 2 8 mansard portal frame 6 2 9 curved rafter portal frame 7 2 10 cellular beam portal frame 8 2 11 gable wall frames 8 2 12 hipped roof frames 9.

Portal frame roof detail.

Where the span of a portal frame is large and there is no requirement to provide a clear span a propped portal frame can be used to reduce the rafter size and also the horizontal shear at the foundations. Typical detail for a steel frame ridge apex roof system with sandwich panels roof ridge flashing support on galvanized z profile purlins. The details were adapted from figures in the apa publication the advanced framing construction guide form m400 which highlights construction. Where supporting a roof or one story and a roof a method pfg braced wall panel constructed in accordance with figure r602 10 6 3 shall be permitted on either side of garage door openings.

Portal frame construction is therefore typically seen in warehouses barns and other places where large open spaces are required at low cost and a pitched roof is acceptable. It is a simple variation of the pitched roof portal frame and tends to be used for smaller buildings up to 15 m span. Method pfg portal frame at garage door openings in seismic design categories a b and c. In a portal frame the header extends past the opening and is tied to its wall with overlapping plywood or osb to stiffen the joint.

1 inch 25 4 mm 1 foot 304 8 mm. Cad details are available in dwg dwf dxf and pdf format. When you locate the detail you want just click one of the four file format buttons to download it to your computer. Portal frames are easy to build on site using common familiar materials.

Generally portal frames are used for single story buildings but they can be used for low rise buildings with several floors where they can be economic if the floors do not span right across the building in these circumstances a skeleton frame with internal columns would be a more economic choice. To view a cad detail you will need a cad design program or a cad viewer program. An introductory section reviews the advantages of portal frame construction and clarifies that the scope of this publication is limited to portal frames without ties between eaves. Steel roof rafter is illustrated with an ipe profile steel section.