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
From: JayLCrawf(--nospam--at)aol.com [mailto:JayLCrawf(--nospam--at)aol.com]
Sent: Thursday, January 20, 2000 10:45 AM
Subject: Re: Diaphragm Design Per 1633.2.9 Using ASD
In a message dated 1/19/00 5:02:08 PM Mountain Standard Time,
> "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?