Safety factors for compression
Safety factors for compression
(OP)
AISC 13th edition table 4-4 uses 0.9 for safety factor in compression. Table 4-15 uses 0.75 for safety factor in compression. Does anybody know the reasoning behind this?
I have a 4 x 4 x 1/2 column that is real close to capacity, my thought was if I filled it with concrete it would give me some added comfort. Guess that's not that case, granted I know it will have more capacity just not by design calculations.
Thanks in advance for any feedback.
I have a 4 x 4 x 1/2 column that is real close to capacity, my thought was if I filled it with concrete it would give me some added comfort. Guess that's not that case, granted I know it will have more capacity just not by design calculations.
Thanks in advance for any feedback.






RE: Safety factors for compression
RE: Safety factors for compression
"The resistance and safety factors adopted for composite columns are rather conservative in order to account for the uncertainty of composite columns and the use of ultimate strength of two different materials in defining the capacity".
I suspect this matter is addressed in AISC Engineering Journal papers if you are interested in further explanation. Look for papers by Richard Furlong and SSRC Task Group 20.
RE: Safety factors for compression
RE: Safety factors for compression
Are safety factors and Phi factors (resistance factors) the same thing? What are their definitions and purposes, and the differences btwn. the two?
RE: Safety factors for compression