Seismic loads with Profis

[skeletron]

The Profis program indicates that for seismic analysis the steel has to fail (highest utilization) before the concrete. I understand the hierarchy of the failure mechanism, however, I can never get the utilizations to work out in practical situations. As I play with it, it seems that you would have to have deep embedment, lots of edge, perfect spacing, and small diameter anchors. I'm wondering if this is the case for others.

My situations are usually wall mounts with very light tension loads (everything is <30% capacity) and the seismic requirements for these structures is limited.

 

[EngineerEIT]

You are referring to the ductile failure requirement in Appendix D, Read this blog post: Link

 

[Deker]

The steel should fail first only if you require ductility out of the connection. As you have found, it is generally more practical to design post-installed anchors for overstrength level forces so that the hierarchy requirements can be neglected.

 

[skeletron]

Thanks for the input and link!