World-leading earthquake engineering technology emanating out of Christchurch is being ignored by some owners in their haste to erect new buildings in the city, said Stephen Hogg.
Hogg has just returned from the 15th world conference on earthquake engineering in Portugal. He said that after having listened to world experts discussing earthquake engineering design, it reinforces the fact that Christchurch, backed by the University of Canterbury, leads the world.
鈥淲hat has horrified me recently is that while walking around the city I am seeing buildings going up that are ignoring the earthquake engineering technology available on our doorstep,鈥� he said. 鈥淚鈥檓 not talking all buildings, but we are in danger of repeating the sins of the past.鈥�
He said that the extra cost of making a building truly dynamic is very small, probably less than 1% of the total build cost.
鈥淐hristchurch has the chance to build the best seismically resilient buildings in the world, but already we are starting to miss a few tricks.鈥�
Central to the low damage design solutions is the incorporation of anti-seismic devices inside the building. 鈥淚t鈥檚 like having a building full of shock absorbers that have the ability to dampen seismic energy while also allowing the building to move with the quake鈥檚 force, to be dynamic. Watch a car with good shock absorbers move and sway when on a bumpy road, it鈥檚 the same principle,鈥� he said. 鈥淎nd the other good thing is that these building shock absorbers only cost a few hundred dollars per unit and can be replaced.鈥�
Hogg added: 鈥淭he old mantra that 鈥榚arthquakes don鈥檛 read design code鈥� is just so appropriate here. It is foolhardy to stick rigidly to code. The last earthquake was twice code and there is no reason that the next 鈥榖ig one鈥� might exceed the new code.
鈥淲hat we need are buildings that are truly resilient, and the place to find that information is right here in Christchurch.鈥�
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