Fabrication and Framing

Fabrication

Structural members are fabricated by methods of shearing, roll-forming, punching, welding, flame cutting, drilling, reaming, etc. in accordance with SBC Building Systems standard practices.

Structural members of welded plate sections have the flanges and webs joined by a continuous automatic submerged arc welding process. Shop welding is performed by certified welders.

Shop connections typically are welded. Field connections normally are bolted using A325 or A307 bolts in punched, drilled, or reamed holes, in accordance with SBC Building Systems standard practices.

Workmanship and fabrication tolerances are in accordance with our quality control standards.

Fabricated parts are identified, either individually or by lot or group, using an identification marking corresponding to the marking shown on the construction drawings. Markings are normally stamped, stenciled, tagged or lettered so as to remain visible after shop painting.

The size and weight of the building components, as packaged and shipped, will permit transportation by common transportation carrier methods, unless stipulated otherwise in the contract document.

Primary Framing

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

RIGID FRAME (RF Series) solid web framing consists of tapered or uniform depth rafters rigidly connected to tapered or uniform depth columns. The frame provides a clear span and is designed to support the loads of adjacent bay spacings, as specified.

CONTINUOUS BEAM FRAME (CB Series) solid web framing consists of tapered or uniform depth rafters rigidly connected to tapered or uniform depth columns. The frame utilizes interior columns and is designed to support the loads of adjacent bay spacings, as specified.

UNIBEAM FRAME (UB and UBL Series) solid web framing consists of a tapered beam supported by uniform depth columns. The frame is designed to support loads of adjacent bay spacings, as specified.

POST AND BEAM FRAME framing members are the primary load-carrying members at the endwalls of the building. These members consist of rake beams, endposts, cornerposts and/or full or partially loaded frames. They may be either welded built-up sections, cold-formed light gage shapes or hot-rolled shapes Full Frame endwall frames may be used in conjunction with endposts when future expansion is required. Half-Loaded Full Frame endwall frames may be used when no future expansion is required, but when endposts cannot be used.

Cold-formed light gage Post and Beam members are normally welded Back-to-Back Cees, 8″ [200 mm.] in depth; and have a minimum yield strength of 55,000 psi [380 MPa].

Secondary Framing

Secondary Framing Members are the structural members which carry loads to the primary framing members. They consist of eave members, roof purlins, wind struts, wind bracing, wall girts and other miscellaneous structural framing and are either welded built-up sections, cold-formed light gage shapes, and/or hot-rolled shapes.

Purlins are typically Zee shaped; 6″ [160 mm.], 8″ [200 mm.] or 10″ [250 mm.] in depth; and have a minimum yield strength of 55,000 psi [380 MPa]. Purlins are designed as simple span or continuous span for loads, as specified.

Girts are normally Zee or Cee shaped; 6″ [165 mm.] or 8 ” [216 mm.] or 10″ [250 mm.] in depth, and have a minimum yield strength of 55,000 psi [380 MPa].

Girts are designed as simple span or continuous span for loads, as specified.

Wind and Seismic forces acting normal to the building sidewall are resisted by the rigid frame action of the primary frames. These forces acting on the building endwall are typically resisted by portal frames, portal braces, or diagonal bracing, in accordance with SBC Building Systems standard design practices. The quantity, size and location of bracing is shown on drawings furnished by SBC. Wind bracing members include rods, angles, etc. and have minimum yield strengths, as required for design and material availability.

Primary Frame flange bracing is normally accomplished by steel angles attached from purlins and/or girts to the primary framing. The quantity, size and location of flange bracing are shown on the documents furnished by SBC. Bracing members have a minimum yield strength, as required for design and material availability.

Base angles are 2″ x 4″ x 0.059″ [50 mm. x 75 mm. x 1.5mm.] steel angles having a minimum yield strength of 55,000 psi [580 MPa]. They are anchored to the floor slab or grade beam with power-driven fasteners or equivalent at a maximum spacing of 2’ [610 mm.] on center and not more than 6″ [152 mm.] from the end of any angle member.

Door headers and jambs are normally Zee or Cee shaped, 8″ [216 mm.] in depth and have a minimum yield strength of 55,000 psi [380 MPa].

Sag angles are bridging members between purlins and are generally angles having a minimum yield strength of 36,000 psi [250 MPa].

Galvanized Secondary Framing

All SBC Building Systems steel buildings come standard with galvanized secondary framing. A zinc oxide coating, not a primer, is applied to all secondary framing for protection against rust and corrosion.