Formula involved in calculating Flexuliar Bending

1. Jan 26, 2008

ronmarie

Hi! I'm new.

I was just want to size Cloumn using a steel which carries a sign board area of 16.60 sq. m and a wind velocity of 130 Km/hr. is it possible to caculate the stress using those two (2) given?

Thank you

2. Jan 26, 2008

FredGarvin

Yes.

Use the sign's frontal area and the wind speed to calculate the overall force. Once you have that you can assume the load is equally shared between the two beams. Treat them as cantilever beams with the force applied to the very end of the beam. From there it's basic beam theory to calculate the flexural/normal stress, i.e.

$$\sigma = \frac{My}{I}$$