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'97 UBC Element Design[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: '97 UBC Element Design
- From: Allen Adams <aadams(--nospam--at)ramint.com>
- Date: Wed, 09 Sep 1998 08:45:21 -0700
>From: Chris Palmateer <chrisp(--nospam--at)vlmk.com> >To: seaint(--nospam--at)seaint.org >Subject: '97 UBC Element Design > >I was hoping that someone could help shed some light on how to do element >design using the '97 UBC. Specifically, I'm looking at designing tall >slender concrete and masonry walls. > >Assuming zone 3 and soil type Sd for a solid grouted masonry wall, equation >(32-2) yields 0.48 Wp (ultimate load). When substituting into the basic >load combinations listed in 1612.2.1 (strength design), equations (12-5) & >(12-6) contain the variable E, where E = (rho* Eh) + Ev. Eh is defined as >"the earthquake load due to base shear, V, as set forth in Section 1630.2 or >the design lateral force, Fp, as set forth in Section 1632". E is now equal >to 1.0(0.48 Wp) + 0.18 Wp = 0.66 Wp! Note that the Ev term is a Vertical load, "equal to an addition ... to the dead load effect...", not a horizontal force. Thus, assuming your other calculations are correct, you would design for a horizontal earthquake force of 0.48Wp, and a factored Dead Load of (1.2 + 0.18)DL or (0.9 - 0.18)DL. Allen Adams
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