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Fwd: Is SMRSF permitted in Seismic Zone 2?[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: addseaoc(--nospam--at)euken.com
- Subject: Fwd: Is SMRSF permitted in Seismic Zone 2?
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 30 Jul 1997 14:20:07 GMT
I am extremely grateful for the three enlightening responses to my = posting. I do not wish to repeat my arguments, but I still feel that the = following points, not touched by any of the three, merit your special = attention: (a) How does one reconcile the wording of Section 1631.2.7 with that of = Section 1922.214.171.124, of the UBC? The former says that in Zone 2, the = frame SHALL AS A MINIMUM, be IMRSF while the latter says that it SHALL = be IMRSF? Would you not agree that it is ONLY by using an IMRSF, in Zone = 2, that one can reconcile both the said sections? (b) How would someone using an SMRSF in Zone 2, enter the code for = meeting the requirements of providing special confinement details, for = "frames resisting forces induced by earthquakes"? Section 19126.96.36.199 of = the code unambiguously states that the frames in Zone 2 SHALL be IMRSF = "proportioned to satisfy ONLY Section 1921.8". On the other hand, the = detailing requirements -- that would naturally go with an SMRSF -- are = specified in Sections 1921.2 through 1921.7 of the code, which sections = are applicable to structures located in Zones 3 and 4 only, under the = provisions of section 19188.8.131.52. (c) How would someone using SMRSF in Zone 2, handle the "members not = part of the lateral load resisting system"? The provisions for such = members are very lenient for structures falling in Zone 2, as only = Section 1921.7.2 is applicable to such members, as stipulated in Section = 19184.108.40.206. Very significantly, even ACI 318 does not have ANY special detailing = requirements for "members not part of the lateral load resisting = system", for structures falling in Zone 2. Naturally, this facility = SHOULD not be available if some one uses an SMRSF in Zone 2 and invites = large inelastic displacements, as a result. To my mind, these large = displacements are very likely to significantly endanger the structural = safety of the gravity members. Does this, too, not reinforce the belief = that significant inelastic action is not INTENDED in Zone 2, in the = first place -- as would be the case if we were to use an SMRSF -- by any = of the above two codes? Perhaps if the word "permitted", used by me in my first posting, is = replaced with the word "contemplated", my case would become more = plausible. Your help would be greatly appreciated. Sincerely, Rizwan Mirza, P.E. Lahore, Pakistan amirr(--nospam--at)paknet1.ptc.pk --- Internet Message Header Follows --- Received: from server1.seaoc.org (bqe.com [220.127.116.11]) by host1.texramp.net (8.8.5/8.8.5) with SMTP id BAA06495 for <rlewis(--nospam--at)techteam.org>; Tue, 11 Feb 1997 01:26:54 -0600 (CST) Received: from [18.104.22.168] by server1.seaoc.org (NTList 3.02.10) id ga003412; Mon, 10 Feb 1997 23:24:02 -0800 Received: from paknet1.ptc.pk by paknet1.ptc.pk; (5.65v3.2/22.214.171.124/14Apr96-0132PM) id AA07621; Tue, 11 Feb 1997 12:21:12 +0500 Received: by aamirr with Microsoft Mail id <01BC1814.AB119500@aamirr>; Tue, 11 Feb 1997 12:11:10 +-500 Message-Id: <01BC1814.AB119500@aamirr> From: ARW <amirr(--nospam--at)paknet1.ptc.pk> To: "'seaoc(--nospam--at)seaoc.org'" <seaoc(--nospam--at)seaoc.org> Subject: Is SMRSF permitted in Seismic Zone 2? Date: Tue, 11 Feb 1997 12:09:32 +-500 Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Reply-To: seaoc(--nospam--at)seaoc.org Error-To: seaoc-ad(--nospam--at)seaoc.org X-Loop: seaoc(--nospam--at)seaoc.org X-Info: [SEAOC] Owner: seaoc-ad(--nospam--at)seaoc.org X-POP3-Rcpt: seaoc-ad(--nospam--at)seaoc.org X-Sender: seaoc-ad(--nospam--at)seaoc.org Precedence: list X-ListMember: rlewis(--nospam--at)techteam.org [seaoc(--nospam--at)seaoc.org] __________________________________________________ Richard Lewis, P.E. Missionary TECH Team rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
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