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Re: Definition of "Service" Loads

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Funny you should mention that.

I've recently come to the conclusion that structural engineers would do well 
 to have a practical understanding of extreme value analysis.

More than once I've been involved in situations where I needed to compute 
the load effects from simultaneous events involving a reasonable return 
period. The magnitude of the events individually would be available, but 
deducing their values at simultaneous occurrence would require additional 
calculation on my part.

An example would be hurricane winds with wind-driven waves acting simultaneously 
 on a shallow water structure such as a wharf or pier.

I've begun teaching myself EVA in my spare time, and plan to use something 
like the R statistical analysis programming language to determine the combined 

William L. Polhemus, Jr. P.E.


> On Jun 12, 2014, at 5:44 PM, "Mark Johnson" <seaint-seaosc(--nospam--at)> 
> wrote: 
> This message was sent by Mark Johnson markajohn(--nospam--at)
> The way the ASCE 7 and
> other documents deal with loads is probably best understood if you're a
> statistician and know how to think about mean times between occurrence,
> etc.  It is arguable that there is now
> such thing as a service load for wind or seismic and probably some other
> things like some hydrostatic or fluid loads.  Especially
> for wind loads after seeing what the ASCE did with wind loads in this last 
> code cycle.
> Mark
> ________________________________
> From: Joel Adair <jadair(--nospam--at)>
> To: seaint-seaosc(--nospam--at)
> Sent: Thursday, June 12, 2014 2:48 PM
> Subject: RE: [SEAINT-SEAOSC] Definition of "Service" Loads

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