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Re: Concrete below base[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Concrete below base
- From: "Ed Workman" <eworkman(--nospam--at)fix.net>
- Date: Thu, 26 Aug 1999 18:07:11 -0700
-----Original Message----- From: jwalsh(--nospam--at)saii.com <jwalsh(--nospam--at)saii.com> To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org> Date: Thursday, August 26, 1999 5:55 PM Subject: Concrete below base >We are designing a steel special concentric braced frame, 3 stories, in seismic >zone 4 with rectangular concrete footings below the braced bays. Section >1918.104.22.168 Says members which transmit seismic forces " to the foundation". It is seldom possible or desirable to mobilize ductility in foundations. Not possible due to proportions, not desirable since cracking and yielding is not visible nor repairable. Thus foundations should instead be designed on the basis of probable capacity of the members delivering forces, or other limiting factors, perhaps stability overturning/rocking behavior, etc.
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