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Article #384Re: Stacking freeways
From: Paul S. Highland
Date: Tue, 14 Aug 2001 18:50
Date: Tue, 14 Aug 2001 18:50
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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. True. I saw photos of the I-880 Cypress structure damage, and one of the pillars had only vertical rebar sticking out of the broken end, no spiral rebar. And to think that I drove that highway at least twice a year in the late 1970s and 1980s, not to mention the millions of others who commuted on it every day. I still remember standing in the driveway of our residence here in AtasCal (nearly 200 miles south of the epicenter) and feeling the ground shake; that's the only time I've ever felt a quake outside. At first I didn't think much of it, but when I tuned into KCBS and heard about the damage, then later saw the photos of the collapsed Cypress, my jaw just about hit the floor and my head was swimming. Thank God there weren't any more fatalities than occurred. === Paul H! in AtasCal
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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: 2001-08-14 11:49:33 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!feed2.onemain.com!feed1.onemain.com!nntp3.onemain.com.POSTED!not-for-mail Message-ID: <3B7972EB.9C46C23@thegrid.net> From: "Paul S. Highland" <paul-kim@thegrid.net> Organization: RailVideo List http://groups.yahoo.com/group/railvideo X-Mailer: Mozilla 4.75 [en]C-NECCK (Win98; 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: 19 Date: Tue, 14 Aug 2001 11:50:19 -0700 NNTP-Posting-Host: 165.121.119.124 X-Complaints-To: abuse@onemain.com X-Trace: nntp3.onemain.com 997814689 165.121.119.124 (Tue, 14 Aug 2001 14:44:49 EDT) NNTP-Posting-Date: Tue, 14 Aug 2001 14:44:49 EDT