About bracings, howTo ? 2

[gasma1975]

Hi,

I have a question about bracings. Do I need to tell Etabs that this type of element is NOT a Moment Frame, it is a bracing ? And it must be designed as a bracing ? HowTo ?

When I have a bracing, I release the M2, M3, T at both ends, is that Ok ? anything else I should do ?

Thx

gasma1975

 

[stressed]

ETABS should automatically assume sloped frames as bracing. Right click some bracing elements after you've drawn them, or after a design (when no output is graphically displayed)and it should say the "line type" is bracing. You may need to divide some X bracing elements at their intersection points to avoid design problems with length.

 

[zstone]

Hi Stressed
Im new in this Forum,
I want tyo ask you, about loads acting on bracings,
When you display results for bracings ( in Etabs ), you will see Bending moments and shear forces,
My question is how do you make bracings to occur only axial loads, or axial loads but only tension values ( of course in Etabs)
best regards

 

[slickdeals]

You have to release moments about both axes at both ends to prevent it from taking moments.
For creating a tension only brace you can look at the following thread

http://www.eng-tips.com/faqs.cfm?fid=1169

 

[stressed]

slickdeals, your suggested method of modeling tension only only members using links, although it's a valid approach, it's a bit outdated as of V9 which came out about 3 years ago, and that approach is more time consuming and less accurate than assigning frame tension/compression limits using the assign menu. After assigning these limits (compression limit 0 = tension only), you need to follow steps 5 through 8 in slickdeals' linked FAQ. But for output, you can view using regular frame results instead of reviewing link results. good luck

 

[liv25k]

Hello,
I' m new in using the program and I have the same problem with bracings and how to make them occur only tension values.
I read the method which slickdeals proposes and I would like to ask if I could use this method with linear analysis.
thank you