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RE: Rho factor for wind and gravity loads?[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Rho factor for wind and gravity loads?
- From: "Paul Feather" <PFeather(--nospam--at)se-solutions.net>
- Date: Wed, 26 Jul 2006 08:29:59 -0700
Under current code, even when wind governs you still must meet the basic requirements and detailing for the lower bound seismic, and this includes the rho factor. Wind loading is very different from Seismic loading in behavior and demand, regardless of which happens to have the higher force level in a given static analysis. If you believe you have a less than acceptable level of redundancy, fix it.
The rho factor itself has had a less than exemplary existence. There are inconsistencies and material issues in trying to apply the rho factor. Though I agree 100% with the need for redundancy, I do not agree with the idea of trying to further codify a less than clearly designed value.
The need for redundancy is one of the many areas to be considered as an engineer during design. We need more thinking engineers with proper mentoring by the older in our profession to create quality balanced designs. We do not need to try and reduce all engineering decisions to some form of less than adequate code equation. Every building and structure is different with different needs and requirements, good engineering is creating the elegant solution; safe, effective, functional, easy to construct, and cost effective while achieving the program goals.
If, as the engineer, you believe that your
particular problem has key elements that require a greater concern for their
loss as it relates to the structure as a whole, then it is your responsibility
to consider and account for this. You don’t need some code
provision to attempt to tell you when and how to consider the problem. Any
Section 1630 of the '97 UBC and
section 1617.2 of the 2003 IBC (section 188.8.131.52 of ASCE 7-02) define the
reliability / redundancy factor rho.
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