Calculating allowable moment for beam
Calculating allowable moment for beam
(OP)
Hi,
I have to check suitability of the selected beam. The problem is that I'm working with aluminum so I can't find a table that has allowable moments, deflection and shear, which means I have to calculate them myself. (Unless anyone knows of a table of allowable moments and shear?) The beams are simply supported on each end.
I have 3 types of beams (SI units):
1. 100x50x6 Channel
2. 100x10 Solid Rectangle
3. 100x75x6 Hollow Section
They are 6061 T-6 Aluminum which has a 275 MPa yield strength, ultimate 310 MPa and Elongation % on 2" of 12 if that is needed.
The factored loading and lengths are:
1. 6.32 KN/m 2.78m
3. 6.82 KN/m 2.89m
4. 6.13 kN/m 2.21m
I have to check suitability of the selected beam. The problem is that I'm working with aluminum so I can't find a table that has allowable moments, deflection and shear, which means I have to calculate them myself. (Unless anyone knows of a table of allowable moments and shear?) The beams are simply supported on each end.
I have 3 types of beams (SI units):
1. 100x50x6 Channel
2. 100x10 Solid Rectangle
3. 100x75x6 Hollow Section
They are 6061 T-6 Aluminum which has a 275 MPa yield strength, ultimate 310 MPa and Elongation % on 2" of 12 if that is needed.
The factored loading and lengths are:
1. 6.32 KN/m 2.78m
3. 6.82 KN/m 2.89m
4. 6.13 kN/m 2.21m





RE: Calculating allowable moment for beam
RE: Calculating allowable moment for beam
RE: Calculating allowable moment for beam
I'm not sure where you are located, but the ADM is used in some areas outside the US, including some areas in Canada and other locations.
The ADM does not give deflection criteria.
To answer your question about the calculations, I would suggest that you get a local structural engineer to help you. Even though the calcs you listed are basic and you have a simply supported condition, you need to look at bracing and connections as well.
RE: Calculating allowable moment for beam
RE: Calculating allowable moment for beam
6061 has an Fu of about 34 ksi - if I remember. Look it up in google
The do the normal calcs.
The buy the book to make sure you are correct
RE: Calculating allowable moment for beam
Note: The welded yield strengths of the 6061-T6 are significantly different depending on weld type, rod and, if structure is reheat treated. For example, for 6061-T6 welded with 5356 filler, the 2005 ADM Table 3.3-2 lists Ftyw = 15 ksi.
RE: Calculating allowable moment for beam