Mixed-Use Building Design: RC vs Steel Schemes with Deep Transfer Trusses and Secant Piled Foundations

This solution compares a reinforced concrete (RC) scheme and a structural steel scheme for a mixed-use building. Key features include a column-free concourse achieved via a 32m deep transfer beam (RC) or a Level 3 transfer truss (Steel), with lateral stability provided by sway frames or braced bays.

Technical challenges addressed include city centre site constraints, a 5m retaining wall, and poor ground conditions requiring secant piled walls and end-bearing piles. Design checks cover Eurocode wind loading, retaining wall pressures, truss member sizing, and pile capacity. Deliverables include schematic plans, connection details, a comprehensive method statement, and a construction programme.