Shear areas Ay and Az

[andlund]

Hi,

I have a column section, see the attachment. I need to calculate the shear areas Ay and Az but when I'm section definition mode and "tick" the shear area box and calculate, no area is calculated. Note that my column has a hole in web. What to do?

Regards,

Anders 

[Pawel.Pulak]

Effective shear areas Ay, Az cannot be calculated for separate sections by section definition module in Robot.

But in case of these parameters they can be simply added from various parts providing directions are coherent.

So the workaround is to:

1/ save such section to user section database without these parameters

2/ define separate parts of sections and  calculate Ay, Az for them

3/ open section database viewer to display user section database, find section stored in point 1/ above and edit Ay and Az fields (see the screen capture below) with the sums of these parameters obtained in point 2/ - pay attention to possible change of Y and Z directions of components

---------------------------------------------
If this post answers your question please click "Accept as Solution". It will help everyone to find answer more quickly!

Regards,

[andlund]

thanks for the answer, I did as you said but then a new problem occured. If I after the save go back to section definition and open my saved cross-section the Az and Ay are not displayed. And if I go back the to geometry window and look in properties the Az and Ay still have zero as value. What am I missing? 

Regards,

Anders

[Pawel.Pulak]

In section definition module it will not be displayed.

But when using such section in some bar of FEA model it will be used there. Moreover it will be used in steel design module in case where selected code does not specify its own formula to calculate it for appropriate type of section.

---------------------------------------------
If this post answers your question please click "Accept as Solution". It will help everyone to find answer more quickly!

Regards,

[hv205]

I don't understand exaclty how to calculte Ay and Az. Please can you explain?

[Artur.Kosakowski]

pp2008's suggestion (point 2 of his answer) was to calculate them separately for each of the "components" (e.g. for "two rectangles" calculate each of them separately) in the Section Builder module and then add up values of Ay and Az obtained for them to edit the corresponding fields in the original (two rectangles) section. 

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.