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- To: seaint(--nospam--at)seaint.org
- Subject: higher loads or better details.
- From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
- Date: Fri, 4 Sep 1998 12:33:00 -0400
Marlou, In comparing the 1997 UBC seismic design with the 1994 seismic design requirements, you have to be aware that the 1997 requirements are based on "ultimate" load requirements while the 1994 requirements are based on allowable stress requirements. To compare the two, the 1997 loads have to be divided by 1.4 (UBC 1612.3.1). [Rhetorical question: Why is it that there are load factors for all other loads but seismic when designing for ultimate loads, and the reverse when designing for allowable stresses? Consistency, where are you?] Proper loads and details go hand-in-hand with each other. A "good" detail for an inadequate load will have the same result as a bad detail for a proper load. For example, if you are in a Seismic Zone 2 area and you design for Seismic Zone 1 forces, but detail in accordance with the requirements for Seismic Zone 2, you are still only designing the connections and detailing for 50 percent of Seismic Zone 2A forces and 38 percent of Seismic Zone 2B forces. Almost everyone who has completed a "Strength of Materials" course should be able to do a respectable job of designing a beam or a column. The material design courses should focus on the performance of the different materials. The reason that so little time is spent on designing connections in college is probably because that is the way most of the professors were taught and that they never had to design many connections themselves and it is easier to teach what has already been learned in previous courses. A. Roger Turk, P.E.(Structural) Tucson, Arizona P.S. BTW, what was the final score in the Arizona-Hawaii football game last night? <g> Marlou Rodriguez wrote: . > My boss, just brought up an interesting idea, . > . > Here in Hawaii, we have just been exposed to the 1997 UBC. We noticed . > that the Base shear has increased by about 30 percent for the 1997 codes. . > . > My boss mentions that it is not the load that will make the building . > stand up, you can increase the load as much as you want but if you do not . > detail it correctly, larger load is no good. . > . > Making sure that your load flows through your connection correctly is very . > important, I think a lot of people getting out of school lacks that . > experience. Included with the Steel, Concrete, and Timber design, there . > should be a special class called connections. . > . > I just recently graduated and I think it was sad that we only spent about . > a week in connections. . > . > Professional Engineer's opinions welcome. . > . > Marlou B. Rodriguez . > Robert Englekirk Inc. . > Honolulu, Hi . >
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