I beam Analysis

[syence]

When is the Y-Axis section modulus used to calculate the bending stress in an I-beam? If the beam is conventionally loaded (simply supported , and load is imparted in the vertical direction on top of the flange), does bending occur about the "Y" or "X" direction? Subsequently, do you use the corresponding section modulus to calculate the stress?? Thank you for your input.

 

[jsha811]

This is a very basic question. Do a google search and you should find tons of information that any of them may help you to solve your program.

Moment curvature analysis,reinforced concrete column design and prestressed concrete pile design at

http://www.structurexpress.com

 

[BAretired]

Load applied parallel to the web, i.e. parallel to the Y axis produces moments about the X axis (major axis), so S_x should be used in determining stress at the extreme fiber. Load applied perpendicular to the web, i.e. parallel to the X axis, produces moments about the Y axis (minor axis) so S_y must be used in determining stress at the extreme fiber.

I agree with jsha811 that this is a very basic question and that you should thoroughly review the principles of beam theory before applying any of this to a real problem.

BA

 

[Jerehmy]

http://paws.wcu.edu/radams/intro_to_beam_theory.pdf

found a decent PP for you, although I only glazed through it

 

[TDIengineer]

Not the right forum for such a question.. unfortunately. But as I have already started a response, I'll attempt to help.

As someone said above, the section modulus axis is perpendicular to the loading direction.

Y-Y axis would be used on an I shape if it happened to be laid flat OR if it was subject to lateral loading such as wind or seismic,