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25th May 2012 - 08:35 AM
I have a question here where i can't solve by myself because i have no basic of physic and not really understand the question because my lecturer teach most of the formulas and counting what are the various units of stress used in structural engineering. provide tables showing some conversions from old units to SI units or others if available.
what are the various forms of stress that one may find happening in building structures and explain them using sketches or pictures.
1a）calculate the maximum bending stress that can happen in a rectangular timber section of 50mm x 75mm, given length of 3.65 meter simply supported at its ends. the uniform loading on this joist is 23.5 kg/m run.
A 3.65 m O
1B) if the beam is made of malaysia timber, advise if the timber beam would be able to handle this stress. if not, propose what type of materials would be able to handle this type of stress.
27th May 2012 - 07:30 PM
Malaysia timber ? I don't know what that is . Hard wood , soft wood ?
Douglas fir is good structurally speaking . Are talking about live load or dead load . That is another key factor . What is it supporting . You should take into consideration heaver items that potentially could be in a space too . Like you don't want to draw in a gigantic whirlpool in the middle of a load then stack a orgy of people or even a hoard of children . Fire places are big concern also if the floor is supporting some zero clearance modern day unit . Some of the wood burners are extremely heavy . People don't think about that when retrofitting after an engineer and and an architect finish schematics.
Live load or dead load . That is what you want to know first .
I don't that kind of work . That is engineer work but if I remember right the formula is 8/12. Don't quote me on that . Ask another engineer . Go to Sciforum . They got engineers there that can help you .
I don't know meters to ft. with out a conversion program either , but lets take a fir timber . You can span about 16 ft with a 5 and half by 10 inch timber but that is dependent on what your loading on it also . The refection . How far to the next barring point plays a roll . So I think you can span at least 16' on each side of the beam and that would fine for a floor load . I loaded a glue-lam 20 ft. each side with 2x12s . The span was about 10 ft and a 3 and a half by 9 inch glue-lam did fine
Good luck . Talk to an engineer . They can give you what you want . There is a lot of factors as I have indicated . So be prepared to have answers
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