Queensland’s falling to bits
A CRACKED expressway on-ramp in central Brisbane may need to be replaced, potentially throwing city traffic into chaos for a lengthy period, the Queensland government has warned.
We’ve had gridlock for a couple of days now as us Brisbanites come to grip with the fact that it’s possible that someone hasn’t been doing their job.
I could be wrong of course.
Transport Minister Paul Lucas has apologised to thousands of frustrated commuters for the mayhem, but said the closures were vital because engineers believed a two-metre long hairline crack on the Ann Street on-ramp was a sign it could collapse.I’m not an engineer but tell me, do two metre long cracks appear overnight and if not, what did the engineers on regular inspections of the city’s infrastructure intend to do about the widening cracks. They do inspect the infrastructure on a regular basis…don’t they?
When there is a crack which gets longer than the critical length (depends on stress, temper ….) it will spread at ~2,000 m/s (for steel). The initial crack may be in a place when it is not visible.