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RE: Seismic Prov. Bracing Connections

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>The AISC Seismic Provisions state for bracing connections

>in SCBF, ( 13.3 in the 97 version ) a required strength being the

>lesser of :

> 

>a. The nominal axial tensile strength of the bracing member,

>    determined as RyFyAg.

>b.  The maximum force, indicated by analysis, that can be

>     transferred to the brace by the system.

> 

> … where does provision a come from?

 

In a special concentrically braced frame (SCBF), the goal is to have a system that can undergo significant controlled inelastic deformations through tension yielding and compression buckling of the bracing elements. The RyFyAg alternative represents the means of estimating the axial force in the brace that the rest of the system will have to withstand to develop the tension yielding in the brace, including the usual overstrength in the steel.


Charlie