Steel Truss Frame with Hollowcore Planks and Bored Pile Foundations over Existing Subway

This solution compares a structural steel frame utilizing 19m span trusses and composite hollowcore planks against a post-tensioned (PT) concrete alternative. The design addresses a critical 18m clear span requirement and stringent site constraints, specifically the protection of an existing subway through the use of sleeved bored piles and compressible foam.

Technical calculations are performed per Eurocodes (BS EN 1990-1997), covering wind load analysis, truss member sizing (chords, diagonals, verticals), column buckling, and foundation bearing capacity. Deliverables include detailed schematic plans, elevations, connection details (welds and bolts), and a professional client letter discussing the structural implications of slab voids and vibration analysis.