Allowable stress for a cantilever beam

[mdaltayeb]

Hey guys, I'm designing a simple lift in the picture below. I've done nearly all the calculations but i still can't figure out how to calculate the maximum allowable load and stress that the beams can withstand. Also will welding affect any of these calculations dramatically?
say that the horizontal beam is 3 ft long with a square cross section of 2X2 inches and wall thickness of 0.5 inch
say that the column is 6 ft high with a cylindrical cross section with an OD 4inch and ID 3.75
the beams are made of AL 6061 T60.

 

[CFDFEAGURU]

For maximum allowable stress values see the AISC steel constuction manual.

https://www.amazon.com/dp/156424055X/?tag=pfamazon01-20

For safety, you should refer to the above book.

Thanks
Matt

 

[mdaltayeb]

Thank you for your reply. However, my design is going to be made out of Al 6061 T60. does this book contains tables for this materials ?
is there other ways to calculate the allowable stress without using these tables ?
thanx

 

[CFDFEAGURU]

My copy is in my office. I can check on Monday for you.

Thanks
Matt

 

[pongo38]

Stress calculations involve assumptions which will be untrue in every practical situation. In this case, lateral buckling sway is an alternative failure mode you need to consider. Always list and consider the assumptions being made. No more 'formula engineering' please.