Secondary members have two other functions: they act as struts that help in resisting part of the longitudinal loads that are applied on the building such as wind and earthquake loads, and they provide lateral bracing to the compression flanges for the main frame members thereby increasing frame capacity.
Purlins, girts and eave struts are designed in accordance with the American Iron and Steel Institute (AISI), “Cold-Framed Steel Design Manual”
Purlins are bolted to the top flanges of rafters and to each other at purlin laps buy means of machine bolts conforming to DIN 933 Grade or 4.6 or equivalent.
Roofs and Wall panels are laid perpendicular to the roof purlins and wall girts, respectively.
These are roll formed z sections or c sections.They are supported on columns, rafters or building walls.
Purlins and Girts are Secondary Framing members used to support roof and walls panels. Girts work in conjunction with columns and wall panels to support the vertical load and improve strength and stability. They also attach and support the wall cladding.
Purlins provide additional roof support, creating a horizontal diaphragm that supports the weight of the roof and deck. These materials are available in different thicknesses and are made from high grade pre-galvanized coils using cold roll forming technique.
Serve the same purposes as purlins and Girts but are better for smaller buildings.
These are formed parallel to the roof slope, and are located along the side wall. Their purpose is to join the roof brace rods and wall brace rods.
Eave Struts are typically constructed from cold formed ”C” sections and are rolled to suit the roof slope. Their primary function is to support the gutters and also to act as a junction of the roof and the wall cladding.
These are long span load carrying trusses suitable for direct support of floors and roof decks in the buildings. The system consists of crimped angles welded to the top and bottom chords.
It is the high strength cable to hold down a building in certain areas.