Selection of Bracing Types and Arrangement 1

[StructuralAddict]

Hello everyone,

I wonder if anyone has a good reference that discusses how to choose the optimum arrangement and type of the bracing members in a braced steel frame?

Also, is there a rule of thumb for selecting an adequate number of bracings?

Thanks a lot!

 

[Deker]

It's a bit dated from a code perspective, but this document lists some pros and cons for different brace types and configurations (Link).

 

[StructuralAddict]

Thank you very much Deker for providing me with this invaluable reference!

 

[vmirat]

That was a good reference. Also consider eccentrically braced frames. Usually the building architecture dictates the type of bracing system. Also, serviceability considerations can drive a particular system, some resulting in stiffer structures than others. About five years ago, I designed a building (24W x 72L x 14H) supported on columns at an elevation of 16 ft above grade, so essentially a building on stilts. The columns had concentric X braces. This year, the owner wanted to enclose the ground level with personnel doors and garage door, and be able to drive a forklift from one end to the other. As a result, I had to remove the X braces and replace them with eccentric braces.