Characteristics
Portal frames consist of built-up welded primary framing members. The frames are fabricated to the exact requirents of the design engineer, and thus provide the optimum design and savings in the weight of steel.
Frames are complemented by flange bracing, connection bolts and anchor bolts. Generally, the base of the intermediate frame is pinned. Certain circumstances demand a fixed base approach.
Steel qualities according to EN 10025: Built-up welded profiles, S355J2G3: Hot-rolled profiles and S235JR:
Protection
All profiles are shot blasted to SA 2. 5. To afford protection during transportation and erection, all profiles receive a shop primer coat of 20/40 microns thickness, in either red or grey colour. Optionally, a finished coat can be provided, with an additional thickness of 40 microns. Endwall frames consist of either built-up welded hot-rolled or cold-roiled columns which support a cold formed Z rafter. Frames are complemented by connection bolts, anchor bolts and wind bracing.
Protection
Cold formed components are galvanised. Built-up welded primary framing members or hot-rolled elements have the same protection as the intermediate frame.
Wind bracing provides the longitudinal stability of the building. It consists of cross bracing located in roof and sidewalls, in one or more bays depending on loadings and the length of the building. If it is not possible to have cross bracing in the sidewalls, it can be replaced by wind portal frames or by fixed base wind columns, located adjacent and connected to the mainframe columns. |
Primary framing consists of all the structural elements which transfer loads to
the foundations. 