This eight unit industrial complex has been brought up to compliance with seismic requirements. With units ranging from 4.5m to 6.0m high, the fully occupied industrial complex provides a wide range of warehousing and associated office facilities for eight independent businesses.
Strengthening the complex involved the cutting and excavation of the existing slabs and backfilling to allow for 23 new 6m x 8m wide x 6m deep reinforced ground beams and 65m x 4m wide concrete columns. These new concrete columns vary in length up to 5.2m high.
A large amount of structural steel was added, including 100 x 100 x 8 angle cross bracing to the roof structure, fixed to the existing UB (Universal Beam), and 200 PFCs (Parallel Flange Channel) which were bolted to all the external columns and precast panels.
Also, there are over 200 150 x 100 angles with 16mm Chemsets, bolting the sides of the existing columns to the precast panels and from the floor to the precast panels.
This work required the removal and reinstatement of some offices and cut outs to walls, which were restored and refinished on completion of the structural steel installation.
The removal of existing jib linings and replacement with jib brace-line in several of the office areas was also a major part of the seismic work.
In accordance with engineer’s requirements, two external concrete bracing frames were added. Each frame included two piles, a 10.5m x 1.2m wide by 6m deep foundation beam, three 6m x 6m x 4.8m columns and a high level 6m x 4m beam. This reinforcement significantly increases the capacity of the building to withstand future seismic events.