PEB

Secondary Framing

Purlins, girts and eave struts are secondary structural members used to support the wall and roof panels. Purlins are used on the roof; girts are used on the walls and eave struts are used at the intersection of the sidewall and the roof.

Secondary members have two other functions:

Act as struts that help in resisting part of the longitudinal loads that are applied on the building such as wind and earthquake loads.

Provide lateral bracing to the compression flanges of the main frame members thereby increasing frame capacity.

Secondary Framing Members are the structural members which carry loads to the primary framing members. Secondary structural framing refers to C sections and Z sections, Grits, Eave struts, Wind bracing, Flange bracing, Base angles, Clips and other miscellaneous structural parts.

Standard C & Z sections and Grits are roll-formed Z- sections with 64 mm flanges 200 mm deep. Eave struts are 200 mm deep with 100 mm wide top flange. Cold-formed members are designed in accordance with the American Iron Steel Institute (AISI) framing.

The material of cold- formed members conforms to ASTM A653M grade SS 340 class 1 or equivalent with Zinc coating to Z 275 designation (275 g/m2). Zinc coating which is 120gsm, 180 gsm and 275 gsm.