# Calculating minimum reserve factor in an I-beam

1. Dec 3, 2013

Hi Everyone, I am confused about how to calculate the minimum reserve factor against yielding and fatigue in an I-beam clamped at both ends. I have calculated the maximum bending stress from it's deflection due to a load in the middle of the beam, and I know the cross-sectional area of the I-beam. Is it now possible to calculate the reserve factors?

2. Dec 3, 2013

### SteamKing

Staff Emeritus
If by 'reserve factor' you mean 'safety factor', you would need to know the strength characteristics of the material used to fabricate the beam, i.e. its yield strength. Yield strength is not the same as modulus of elasticity.

3. Dec 3, 2013

Thanks for the reply, yes I do mean the safety factor. And I do have all the strength characteristics of the beam, sorry I forgot to mention that in the original post. So is it now possible to calculate the safety factors?

4. Dec 3, 2013

### SteamKing

Staff Emeritus