- Precast beams of varying spans supporting a precast slab.
- A mixed steel-concrete structure with some use of steel beams on typical floors.
- Vast array of different precast members (no economies of scale through repetition).
- Construction delay due to lifting requirements of several precast items.
- Lateral stiffness compromised by precast slabs, resulting in inter-storey drift issues.
BG&E ALTERNATIVE DESIGN
- Precast beams and slabs were replaced by an in-situ reinforced concrete slab.
- Single band beam along the “spine” of the building to increase lateral stiffness.
- Structural steel beams eliminated.
- By optimising the structural design, constructability of the building was significantly improved.
- The construction period was reduced. Floor cycles were reduced from 8 days to 3 days per floor.
- Mep piping runs improved by eliminating downstand beams (straight runs and no penetrations).
- Increased ceiling void for mechanical services.
- Significant financial savings.