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Re: Upgrade Fatigue?

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Actually what they did was REMOVE the three importance factors and give you 
 three maps!

I'm not 100% sure that's an improvement but as my old grad school prof used 
 to say "how do we know its the correct way? Cuz majority rules."

(Majority of the committee members that is).

William L. Polhemus, Jr. P.E.


On Apr 10, 2013, at 7:14 PM, Drew Morris <dmorris(--nospam--at)> wrote:

> On 4/10/2013 1:02 PM, Carl W. Jenne, P.E. wrote:
>> In Florida we've already adopted ASCE 7-10.  The revised wind provisions
>> with its different wind speeds have been a real hassle to explain to
>> architects.
>> Architect:  "What's the wind speed in that location?"  Us:  "It depends.
>> The wind blows harder on a hospital than it does on an office building."
>> In order to save us the trouble of multiplying by 1.15 they increased 
>> the physical size of the code and opened a can of worms.  Ever try to 
>> explain mean recurrence intervals to an architect?
> We have noticed the same problem up here in Alaska.  Where once you had 
> to interpolate between closely spaced contours to determine the wind 
> speed in coastal communities in Alaska, now with the much improved ASCE 
> 7-10 version, we have to interpolate between three maps depending on the 
> building classification.  It would seem that if the problem was with the 
> recurrence rates, they have kept with one map and adjust the importance 
> factor. 
>> Regards,
>> Carl W. Jenne, P.E.
>> Allan and Conrad, Inc.
>> Consulting Structural Engineers

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