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Re: IEBC Seismic Forces

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I would think that and EBF would a good candidate for inclusion since it would sorta be beside the purpose of an EBF to design it for Ordinary or Intermediate level of detailing. To me EBF=Special Detailing.

A light framed wall system (wood framed) has an R=6.5 in the current code. That's a big penalty. Sheathing is easy to strengthen, but hold-down forces might be tough to get to work if a building is sitting on a dinky 12" deep footing.


On Jan 28, 2008 7:14 AM, Ehrlich, Gary <gehrlich(--nospam--at)> wrote:

I'm reviewing code proposals for the IEBC (and its implementation in the IBC and IRC) and had a question regarding the determination of seismic forces. The current provisions direct you to use the seismic coefficients for an "Ordinary" system unless you can show your system meets the detailing requirements for an "Intermediate" or "Special" system.


That's fine if I have a steel or concrete moment frame, or concrete or masonry shear wall. What about if I have a light-frame shear wall, EBF, or any other system that isn't split in those three categories? Would the average code user (engineer or plan reviewer) just treat those systems as if they were classified as "Ordinary" and just make sure they meet the standard detailing requirements for that system. Or is someone out there going to read the code as saying you can't apply the IEBC to non-moment frame, non-concrete/masonry shear wall system?





Gary J. Ehrlich, PE

Program Manager, Structural Codes & Standards

National Association of Home Builders (NAHB)

1201 15th Street, NW, Washington, DC 20005

ph: 202-266-8545  or 800-368-5242 x8545

fax: 202-266-8369