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RE: Diaphragm Design Per 1633.2.9 Using ASD

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There may be a mistake in the code reference, but I did not make it. I
copied this section (cut and paste) from the '97 UBC on CD-Rom. I went back
to check the reference to 1809.2 and it is stated this way.  The section I
copied was section 1612.3.1 Basic Load Combinations. Section 1809 states:
" 1809.2 Soil Capacity. The foundation shall be capable of trans-
mitting the design base shear and overturning forces prescribed in
Section 1630 from the structure into the supporting soil. The
short-term dynamic nature of the loads may be taken into account in
establishing the soil properties."

I guess the reference is to the "short-term dynamic nature of the loads"
based on certain soil conditions.

Can anyone explain the intent of this reference?

Dennis S. Wish PE

-----Original Message-----
From: JayLCrawf(--nospam--at) [mailto:JayLCrawf(--nospam--at)]
Sent: Thursday, January 20, 2000 10:45 AM
To: seaint(--nospam--at)
Cc: seconsultant(--nospam--at)
Subject: Re: Diaphragm Design Per 1633.2.9 Using ASD

In a message dated 1/19/00 5:02:08 PM Mountain Standard Time,
seconsultant(--nospam--at) writes:

> "Where allowable stress design (working stress design) is used, structures
>  and all portions thereof shall resist the most critical effects resulting
>  from the following combinations of loads:
>  D                        (12-7)
>  D + L + (Lr or S)                (12-8)
>  D+(W or E/1.4)               (12-9)
>  0.9D+/-E/1.4             (12-10)
>  D+0.75[L+(Lr or S)+(W or E/1.4)] (12-11)
>  No increase in allowable stresses shall be used with these load
>  combinations except as specifically permitted by Section 1809.2."

In my code 1809.2 refers to soil capaicty.  Is it possible you sited the
wrong code section?