Steel substructure and secondary steel structural calculation
Where aluminium systems cannot connect directly to the structure, steel steps in. We calculate secondary steel, cantilevers and canopy supports.
Why it matters
Lobby facades with tall storeys, set-back structures, canopies and heavy cladding usually require intermediate steel whose stiffness directly affects aluminium deflection.
We model steel members, connections and anchors together with the aluminium system in one consistent report.
Systems
- Secondary steel behind lobby facades
- Cantilevers and canopies
- Stone and heavy cladding steel
- Pergola and winter garden steel
- Signage supports
Standards
- EN 1993-1-1
- EN 1993-1-8
- EN 1090-2
- EN 1991-1-4
- EN 1992-4
Quick quote
Send drawings and the project address; we will define the scope together.
Send project details WhatsAppWhat we check
Members
Bending, buckling, LTB and deflection.
Connections
Welds, bolts and end plates.
Stiffness
Effect of steel deflection on aluminium.
Anchors
Base plates and anchors.
Information for a quote
- Architectural and structural drawings
- Facade system and loads
- Building structure data
Deliverables
- Steel structural report
- Section and connection selection
- Principle details
Steel Substructures
Are steel and aluminium modelled together?
Yes, where needed, so that steel deflection and the resulting effects on aluminium profiles and glass are assessed together.
Related structural calculations
Anchor, Bracket & Connections
Brackets, welds, bolts and concrete anchors, with manufacturer software and FEM.
Details →Bolts, Screws & Welds
Bolt, screw, rivet and weld calculations for aluminium and steel; galvanic corrosion details.
Details →Facade Detail Design
Principle and shop details: slab edges, sills, corners, movement joints, fire stopping. DWG delivery.
Details →Curtain Wall Structural Calculation
Mullions, transoms, glass, brackets and anchors to EN 1991-1-4, EN 13830 and EN 1999-1-1.
Details →Window, Door & Sliding Systems
Large windows, lift-and-slide and folding doors: profiles, reinforcement, glass and sash weight.
Details →Glass Balcony & Guillotine Glass
Folding glass balconies and guillotine glass: wind, glass thickness, tracks and anchors.
Details →Let’s talk about your project
Send drawings, elevations and system information; we will define the scope and timeline and get back with a quote.


