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FW: LRFD Load Factors.[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint'" <seaint(--nospam--at)seaint.org>
- Subject: FW: LRFD Load Factors.
- From: "La Count, Curt" <Curt.LaCount(--nospam--at)Jacobs.com>
- Date: Fri, 20 Nov 1998 11:00:00 -0800
Dave, You make a very good point. The material factor phi was determined by comparing the material strength and dimensional variations produced to meet certain tolerances. If the material is produced under conditions exceeding the assumed tolerances, then phi factors should decrease to provide the same reliability. In lieu of local provisions, this is where engineering judgement is used. I have worked with British Standards and have noticed that they are very similar to the American LRFD. Someday, when we Americans master metric units, we can all be working off the same page. Thanks for your comments, Curt La Count, P.E. Jacobs Engineering Portland, OR ---------- I think you are only right when dealing with a consistent set of codes and this hasn't been expressly stated in this thread so far. In New Zealand for example, load factors and phi factors are different to Australia codes, but when only one or the other is used both codes provide a similar design and factor of safety (excepting earthquakes - lets not get sidetracked on this example!). Using the Australian loading standards in combination with New Zealand material standards would not be correct. I think load factors apply only to the code that are stated in. A code which has poorly defined loadings for say wind or earthquake would/could have a higher load factor to compensate and therefore be only applicable when used within that code. Material quality and more importantly construction quality DO vary around the world. I would expect material factors to vary on this basis alone. This makes me think that not only is it appropriate to use a consistent set of standards for design, the construction specifications would also need to be those developed around those same codes. From personal experience, it is difficult specifying local specifications in a different part of the world where the industries there have there own codes or an other country's code and are unfamiliar with the specified ones. Regards Dave Meney
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