At the same time steel ties were inserted through the outside walls to the double brick walls inside. And three concrete pillars were installed on the north-facing wall, supported by new foundations directly underneath them.
Mr Grobecker said these pillars and a ply diaphragm in the ceiling will stop the building flexing in a major earthquake.
"It's really the only major structural change that's happening inside the building," he said.
And while the construction work draws to a close there's been more good news for the library.
It has been awarded $120,117 by the Lottery WWI Commemorations, Environment and Heritage fund to improve conservation and storage of its heritage collections. The funding will provide a new climate-control system in the collection store and mobile shelving.
The earthquake strengthening project has brought the Alex up to 67 per cent of the building standard.
Improvements also included refurbishing offices and public toilets and an accessibility ramp.