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Re: Jib crane impact factor

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You're right. I was only thinking of crane runways when sending my e-mail. 
I still find LSD a pain in the butt when dealing with complex structures, 
e.g a blast furnace tracking all the dead, live loads and all the others. 
However that is way behind me now as I stick to easier stuff. No more 
_interesting_ jobs!

On 2013/07/05 9:27 AM, Polhemus, William wrote:

That's not the point.

1. It's consistent with general structural design principles.

2. It more accurately reflects categorical load effects.

3. It lets you use one set of load combinations for all materials instead
of having to account for different sets of them depending on what you're

I learned ASD/WSD in school and used it several years thereafter. Then I
switched. It was never a problem for me.

Going back because "everyone I know users the other method" would be

William L. Polhemus, Jr. P.E.


On Jul 4, 2013, at 8:12 AM, "Gary L. Hodgson and Assoc."
<design(--nospam--at)> wrote:

... I and others whom I know have never used Limit States Design (your
LRFD). There is no real savings in it except in building structures.


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