Primary & Secondary Framing

Structural frame members are separated into two different categories, Primary and Secondary members.

  • Primary Frames are the main load-carrying structural steel components. They may be Clear-span Rigid Frames, Continuous Beam Frames, or Post & Beam Frames.

    primary framing system

    Primary frames are designed in accordance with the steel construction manual published by American Institute of Steel Construction (AISC). Manufacturing dimensional tolerances are in accordance with the requirements of ‘Metal Building Manufactures Association’ (MBMA) of USA, “Low Rise Building Systems Manual”. Besides AISC and MBMA, we also design buildings with IS-875, 1984 and IS-875, 2007.

    Built-up sections are fabricated from hot rolled steel plates confirming to ASTM A 572M grade or equivalent with minimum yield strength of 345N/mm2 (50ksi).

    The most common primary framing systems are illustrated here. All structures shown are symmetrical about the ridgeline. Framing systems unsymmetrical about the ridgeline and Multispan Framing Systems with unequal width modules are possible too.Practically any frame geometry can be erected.

  • 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.

    C- Sections & Z – Sections

    Secondary Framing DeltaStandard 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

    Secondary Framing System

    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). We supply, zinc coating which is 120gsm, 180 gsm and 275 gsm.