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Article #390Re: Stacking freeways
From: Mike Nelson
Date: Tue, 14 Aug 2001 01:11
Date: Tue, 14 Aug 2001 01:11
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2278 bytes
William Lynch wrote: > I (not an engineer) was under the impression that the main reasons > for the catastrophic failures of the double decker sections were > twofold: lack of flexibility in the joints, and lack of spiral rebar > to contain the vertical rebar. These both obviously relate to the > knowledge level of the 50s, but is it possible to address these > problem areas and build a functional double decker structure? After the Loma Prieta earthquake, there were many articles in local newspapers and other media about the failure of the Cypress structure in Oakland. The design handbook in use at the time by CalTrans had the circumferential reinforcement that the Cypress structure lacked. The big mystery was why the plans for the structure were drawn without it. Regards: -- Mike Nelson http://MichaelTNelson.com
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fd3ff,aa5314338c14ea63 X-Google-Attributes: gidfd3ff,public X-Google-Thread: f59f9,865b7458dc0f15ec X-Google-Attributes: gidf59f9,public X-Google-ArrivalTime: 2001-08-13 18:10:55 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news.tele.dk!small.news.tele.dk!209.30.0.50!nntp.flash.net!easynews!sjc-peer.news.verio.net!news.verio.net!sjc-read.news.verio.net.POSTED!not-for-mail Message-ID: <3B787A69.5110A5E2@MichaelTNelson.com> From: Mike Nelson <MNelson@MichaelTNelson.com> Organization: Michael T. Nelson, Inc. X-Mailer: Mozilla 4.75 [en] (WinNT; U) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: la.transportation,ba.transportation Subject: Re: Stacking freeways References: <88e6ca33.0108090052.98e157@posting.google.com> <3B72B2AA.CA9FBCA1@thegrid.net> <3B72C87B.38024F02@but.us.chickens> <88e6ca33.0108101737.4377befd@posting.google.com> <B799E2A0.4F10E%mmullen8014@home.com> <3B75372C.D1B811C@big.top> <8e360b53.0108130946.66e8b1@posting.google.com> <3B782BD4.9BC7FE22@big.top> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 20 Date: Tue, 14 Aug 2001 01:11:59 GMT NNTP-Posting-Host: 216.102.206.12 X-Complaints-To: abuse@verio.net X-Trace: sjc-read.news.verio.net 997751519 216.102.206.12 (Tue, 14 Aug 2001 01:11:59 GMT) NNTP-Posting-Date: Tue, 14 Aug 2001 01:11:59 GMT