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Post subject:car ports advice required please
 Posted: Jun 05, 2008 - 05:56 PM #7625
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Joined: Mar 10, 2008
Posts: 18
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| can anybody PLEASE advise me as to either rule of thumb or correct sizing of cantilever beams, I am not an academic and trying to evaluate the beam load software drives me crazy, here in Brazil I have found a small niche for car ports in apartment blocks, only for some relief from direct sunlight and cover for rain, what I really need is advice relating to max length of beam from fixed end, with a cantilever truss, the minnimum dimension of section material, if at all helpfull max dimensions for 1 car port to be 15ft x 10ft x 6ft high, obviously, too for say a row of 10 cars with the minnimum amount of columns and beams, I think sq., rect tube and or channel topped with corrugated galv. sheets, if anybody can advise me please I will be very obliged. please bear in mind material costs here in Brazil are as I presume as expensive as the USA, 15ft x 3ft corrugated galv sheet is approx $R220-00 USA $110-00, |
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Post subject:RE: car ports advice required please
Posted: Jun 09, 2008 - 03:08 PM #7635
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Power User
Joined: Sep 03, 2003
Posts: 174
Location: edinburgh
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You will need to do a framework diagram to determine the loads on each member and also to determine which members are in tension and which are in compression ,also because it is a cantillever you will also need to determine the magnitudes and directions of the reactions at the wall ,rule of thumb though if you get strong enough fixings it wont fall down
aw ra best Marky |
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Post subject:RE: car ports advice required please
Posted: Jun 10, 2008 - 02:54 PM #7640
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Joined: Mar 10, 2008
Posts: 18
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thanks Marky for taking the time to reply it is much appreciated, your words are of wisdom and I do realise are fact, BUT I really need how does a simpleton (me) without trial and error calculate the correct dimensions to support say 40 pounds on one simple beam 14 ft long but only secured at one end ie a column with a cantilever ??? again hopefully not to have a safety factor of 60% (overkill)
regards, vince |
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Post subject:RE: car ports advice required please
Posted: Jun 10, 2008 - 04:18 PM #7641
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Power User
Joined: Sep 03, 2003
Posts: 174
Location: edinburgh
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Hi Vince.
if you project from the wall 10ft the slope only has to be 18" at the back ,this gives enough run off for rain or snow (dont think the latter is a problem in brazil) at these kind of sizes a 1 1/2" x 1 1/2" x 1/8"hollow section would do .this weighs 5 lb a linier foot so your frames would only weigh 110lb approx ,so a fixing like a 10mm thrubolt fitted through the hollow section would do.remember all the downward forces are pulling at the top corner so a fixing as near to the top as possible ,if it is possible to send a sketch with rough dimensions i will dust off the gray matter and do some calculations for you .
Aw ra best Marky |
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Post subject:RE: car ports advice required please
Posted: Jun 11, 2008 - 04:28 PM #7654
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Joined: Mar 10, 2008
Posts: 18
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yo!!! Marky, you are a diamond, thanks a million, yes you are right snow no problem here in Brazil, I will send you a sketch with my estimoited (oops cockney) estimated dimensions and would appreciate any remarks you may offer, you Marky have made my day, thanks a million
regards Vince,
I used to be conceited, but now I am perfect (lol) |
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