loads for temporary aircraft hangars
loads for temporary aircraft hangars
(OP)
Pals
Temporary aircraft hangars of the type that use tensile fabric, has a typical life span of 20-25 years, simply put the design life is less than 50years.
Doesnt this mean they should be designed for reduced wind and snow?
But ASCE7 has no importance factor less than 1.00, and using ASCE7 means designing for life of 50years as a minimum.
Any other code you can suggest that mentions reduction?
respects
ijr
Temporary aircraft hangars of the type that use tensile fabric, has a typical life span of 20-25 years, simply put the design life is less than 50years.
Doesnt this mean they should be designed for reduced wind and snow?
But ASCE7 has no importance factor less than 1.00, and using ASCE7 means designing for life of 50years as a minimum.
Any other code you can suggest that mentions reduction?
respects
ijr






RE: loads for temporary aircraft hangars
I would not want to tell the owner after something happened, 'Well, it did have a 50% chance of collapsing sometime during its life time...'. Don't thing they would be very happy. Though their laywer might be!
Also, keep in mind that some 'temporary buildings' last a lot longer than planned. Last year I did some inspections/evaulations on some 'temporary buildings' on an Air Force base that were built in 1943. They are still referred to as 'temporary' 65 years later.
JMHO.
RE: loads for temporary aircraft hangars
ASCE7 are for a 1 in 50 year return period, NOT a 50 year design life. This means that this wind speed/snow loading will occur on average once every 50 years, but as this is only an average return it is entirely possible for this speed to occur several times in a 25 year period.
25 years is not a temporary structure, 25 years is a normal design life for many residential structures.
Temporary structures are normally considered those with lives less than one year.
RE: loads for temporary aircraft hangars
That's fine as long as a) you're willing to accept that responsibility, b) you do enough extra work to truly justify the reduction in loading that you are talking about, c) the owners and building officials are fully aware of the reduced design criteria and that reduced design criteria is clearly spelled out as a part of your contract.
To me this is almost like doint "performance based design". Design fees for that sort of work are tremendous. If you're not going to go through that type of work (or you are not going to get paid for it) then I would say that you should just stick with the regular building code criteria and call it conservative.
RE: loads for temporary aircraft hangars