IStructE Jul 2025 solution Question 1

10-Storey Steel or Concrete Frame Law Court with Shear Cores, Vierendeel Trusses, and Pad/Raft Foundations

Solution Overview

This solution compares two structural schemes for a 10-storey law court: a steel frame with metal decking on pad foundations, and a concrete frame with waffle slabs on a raft foundation. Key challenges include managing large 15m spans, cantilevered overhangs for the atrium, and lateral stability using shear cores without internal bracing.

Detailed calculations cover wind loading, bracing ties (SHS), shear core design, and axial/moment checks for internal and external columns (UC sections). Foundation design includes pad and raft sizing. The solution also includes A1-A3 carbon footprint estimates, schematic plans, sections, connection details, a construction method statement, and a client recommendation letter.

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