Return to index: [Subject] [Thread] [Date] [Author]
Shear wall horizontal steel engaging end verticals when Vu>Acv*sq rt(f'c). 1997 UBC 1921.6.2.2 vs. IBC - ACI318/R99 Sect. 21.6.2.1
[Subject Prev][Subject Next][Thread Prev][Thread Next]- To: "IBC list (E-mail)" <IBC_IRC(--nospam--at)listbot.com>, "Se-Practice List (E-mail)" <se-practice(--nospam--at)polhemus.cc>, "Seaint list (E-mail)" <seaint(--nospam--at)seaint.org>
- Subject: Shear wall horizontal steel engaging end verticals when Vu>Acv*sq rt(f'c). 1997 UBC 1921.6.2.2 vs. IBC - ACI318/R99 Sect. 21.6.2.1
- From: "Haan, Scott M." <HaanSM(--nospam--at)ci.anchorage.ak.us>
- Date: Mon, 12 Mar 2001 12:48:56 -0900
Hello: 1997 UBC 1921.6.2.2 required horizontal concrete shearwall steel to engage end vertical steel when Vu>Acv*sqrt(f'c). The 2000 IBC adopts ACI 318-99. ACI 318-99 does not clearly spell out that horizontal steel needs to engage end verticals when Vu>Acv*sqrt(f'c). The IBC does not amend ACI 318-99 on the subject. ACI 318-99 section 21.6.2.1 indicates only reinforcement that is required for shear strength needs to be continuous. Shear reinforcement is not required for strength until Vu>phi*Acv*2*sqrt(f'c). ACI 318-99 section 21.6.2.3 indicates that continuous reinforcement needs to be spliced and anchored per ACI 21.5.4. This means horizontal reinforcement is not required to be continuous when Acv*sqrt(f'c)<Vu<phi*2*Acv*sqrt(f'c). ? I see Acv*sqrt(f'c)<Vu<phi*2*Acv*sqrt(f'c) all the time in low buildings. ACI 21.5.4 does not mention engaging end bars. Even if the shear reinforcement is needed for strength [Vu>phi*Acv*sqrt(f'c)] and is required to be continuous it could be turned down or up and not have to engage end verticals the way ACI 318-99 appears to be written. What is the reason that the UBC requirement appears to be lessened in ACI 318-99? Is it to eliminate horizontals engaging end bars for tilt-up? This question is pertinent to our local IBC code adoption. Thanks for the one private response the last time I asked this. Thank you, Scott M Haan P.E. Plan Review Engineer Building Safety Division http://muni.org/building, Development Services Department, Municipality of Anchorage phone: 907-343-8183 fax: 907-249-7399 mailto:haansm(--nospam--at)ci.anchorage.ak.us
- Prev by Subject: FW: Shear wall horizontal steel engaging end verticals when Vu>Ac v*sqrt(f'c)
- Next by Subject: Shortening existing concrete joist
- Previous by thread: Re: PLT of AutoCAD
- Next by thread: Drift Control
- About this archive
- Messages sorted by: [Subject][Thread][Author][Date]