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RE: Wind load and pile depths for wooden fences (San Jose)

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One other point. Playing around with structure life expectancy and risk of
load exceedence, can pose problems and cause hazards to life.

For example if declare that a steel carport only has life expectancy of say
25 years, whilst house 50 years. Then at the severe storm event for the
house, there is the risk of carports becoming airborne debris and posing a
risk to life at that event.

But economically, many carports and verandahs only have a life expectancy of
around 5 or 10 years depending on style, and are the simplest change to make
to modify appearance of a house, and therefore are often changed frequently.
Starting with a cheap carport that does the job, then a few years later
being changed when can afford something more stylish.

To argue, that the structure life expectancy be reduced, and the risk of
load exceedence be maintained at 5%, resulting in a lower design load, can
result in a hazard to life under more extreme conditions.

Thus have a problem of balancing the hazard to life, against the economic
costs and potential economic loss, along with consequential damage to other
property. Gets complicated if want to use alternate solutions to meet
performance criteria of the building code of Australia (BCA), rather than
comply directly with the deemed-to-satisfy provisions. But the BCA does
provide scope to so deviate.


Regards
Conrad Harrison
B.Tech (mfg & mech), MIIE, gradTIEAust
mailto:sch.tectonic(--nospam--at)bigpond.com
Adelaide
South Australia


 



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