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Primary & Secondry Framing

Posted by : Pebtrade / Posted On : Fri, 23 Oct 2020

PRIMARY FRAMING

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 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 ridge line. Framing systems unsymmetrical about the ridge line and Multi span Framing Systems with unequal width modules are possible too. Practically any frame geometry can be erected.

Clear span

maximum practical width = 90 m

Multi gable

Maximum practical module width = 80 m

Multi span1

Building with one interior column – maximum practical module width = 70 m

Multi span2

Building with one interior column – maximum practical module width = 70 m

Single slope

Building without interior columns – maximum practical width = 50 m

SECONDARY FRAMING

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).

2 Comments

Sushil Kumar Raj
Tue, 18 Feb 2020, 02:44 pm

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