Multi-Storey Steel Buildings

In multi-storey frames the largest savings come from repetition and floor depth. We rationalize beam sizes into a small family of sections, tune composite action to reduce beam weight, and test alternative grids for their effect on column tonnage and foundation loads. Planned web openings let services pass through beams instead of under them, which can reduce overall building height. Column sizes are stepped at splice levels, and connection types are chosen to minimize site welding and speed up floor-by-floor installation.

Typical members include rolled columns with shop-welded splice plates, composite floor beams with stud layouts and cambers, cellular or castellated beams, and braced core elements with gusset assemblies. Moment connections and column base plates receive full-penetration or fillet welds to qualified procedures under the AWS D1.1, AS/NZS 1554.1 or EN 1090 requirements specified. Each piece is marked with its grid, level and erection mark so that crews can install floor packages in sequence without searching the laydown area.

Hole patterns for deck fixings, edge trims and service openings are cut by CNC from the BIM model to keep alignment between floors consistent. Beam cambers are induced in the shop where the design calls for them, and stud positions are marked or pre-welded to suit the deck layout. Column lengths are controlled carefully at splices so that accumulated tolerances over many storeys stay within the limits needed for plumb, level floors.

Each project runs to an inspection and test plan that sets hold and witness points for material receipt, fit-up, welding and coating. Plates and sections are traced to mill certificates through heat numbers recorded against piece marks. Ultrasonic testing is applied to complete-penetration welds at moment and splice connections, with magnetic particle testing for fillet welds where required. Column lengths, splice squareness and connection hole positions are checked dimensionally, and results are compiled into a quality dossier issued with each delivery batch.

Most framing in occupied buildings sits in a mild interior environment, so a shop primer compatible with the specified fire protection system is often sufficient. Exposed perimeter steel, podium transfer members and parking levels may need a full ISO 12944 system suited to C3 or C4 exposure. We coordinate primers with intumescent coatings or board systems, keep top flanges uncoated where shear studs will be welded, and mask faying surfaces of slip-critical bolted connections to the class required.

Steel is packed and shipped by floor and erection zone, so that columns, beams and bracing for one tier arrive together. Long columns and heavy transfer girders are planned for flat rack or break-bulk shipment, while connection plates, bolts and studs travel in labeled crates within standard containers. Each shipment carries a packing list cross-referenced to erection drawings, plus the commercial invoice, certificate of origin and other export documents needed for customs clearance at the destination port.

We provide erection drawings showing piece marks, bolt schedules and splice details for every level, together with a recommended sequence that keeps the frame stable as floors are added. Our engineers give input to the erection contractor method statements on temporary bracing, deck installation order and column plumbing tolerances. Where agreed, we offer technical supervision or remote advisory support to resolve fit-up questions quickly. Erection itself is carried out by the appointed contractor.