Primary Steel Frame Systems

Framing Systems

Ceco’s primary steel frame systems consist of interior building frames, building end frames – including rafters, corner posts and end posts – and crane systems.

Primary frames span the width of a building and are designed for full bay loading. Our primary steel frame system includes interior building frames, building end frames (rafters, corner posts, and end posts), building bracing, and crane systems.

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Interior Building Frames

A rigid interior frame consists of welded-up rafter and sidewall column sections. Rigid frames are available as symmetrical, asymmetrical and single-slope shapes in clear span and multi-span options.

Sidewall columns are pinned at the base but may have a fixed base for special applications. Rafter is continuous throughout with a single ridge. Interior columns used with multi-span rigid frames are pipe sections with pinned connections at both ends; standard and fixed connections optional. Building frame systems are designed by stiffness analysis. Note: pipe sections are the standard offering for interior columns with built up members and hot rolled shapes as additional options.

Building End Frames

Bearing end frames and rigid end frames (half load) are used at end walls of building systems where future expansion is not anticipated. Rigid end frames (full load) are used where future expansion at that end of the building is anticipated. End posts in full load rigid end frames are designed to provide girt support for a “temporary” end wall. Members are formed from hot rolled or welded-up members.

Building Bracing

Ceco’s engineers will design bracing to meet wind/seismic load requirements for any given building. Diaphragm bracing will be used whenever appropriate, but will be supplemented and/or replaced with rod, angle, or cable bracing when diaphragm capacity of sheeting is inadequate. If building requirements preclude the use of rod bracing in side walls, this “X” bracing will be replaced by cantilever columns, or portal frames.