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Fwd: Re: Isolated pad footings - To tie or Not to tie?[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: Fwd: Re: Isolated pad footings - To tie or Not to tie?
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 30 Jul 1997 14:18:38 GMT
Dennis: I feel that while it is true that "tying the footings will not prevent a = differential settlement", I do believe that a moment carrying = connection, between the tie-beam and the post, would greatly alleviate = the effect of vertical displacement caused by differential settlements, = on to your truss superstructure. This, on this account alone, should be = a requirement only if you are expecting substantial differential = settlements. In general, large total settlements are likely to be = accompanied by large differential settlements. As a separate consideration, if you do consider a lateral restraint = necessary, and wish to depend upon the patio slab for this, you might = wish to compute the order of available reastraint that the patio slab is = likely to offer. The weight of the patio slab, multiplied by the = applicable coefficient of friction, should serve as a good estimate of = the available restraint. If the available restraint is adequate, with a = factor of safety, you might like to connect the post, through = reinforcement flaring out, in a semicircular fashion, into the slab for = some distance, even if the slab itself is unreinforced. Check the = tensile stresses, in the slab, at the termination of the reinforcement. I have successfuly used something very similar, by depending upon the = reinforced floor slab for connecting the two opposite columns of a gable = frame, 120'-0" apart, and subjected to a horizontal column reaction. I = used this technique as an alternate to connecting the two opposite = columns through a 120'-0" tie-beam, and in preference to the even more = difficult alternate of having to design the isolated footings, for the = hrizontal reaction. Rizwan Mirza, P.E. amirr(--nospam--at)paknet1.ptc.com --- 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 EAA04610 for <rlewis(--nospam--at)techteam.org>; Fri, 14 Feb 1997 04:04:20 -0600 (CST) Received: from [18.104.22.168] by server1.seaoc.org (NTList 3.02.10) id xa003689; Fri, 14 Feb 1997 01:59:18 -0800 Received: from paknet1.ptc.pk by paknet1.ptc.pk; (5.65v3.2/22.214.171.124/14Apr96-0132PM) id AA13948; Fri, 14 Feb 1997 14:56:50 +0500 Received: by aamirr with Microsoft Mail id <01BC1A85.D5D1CBC0@aamirr>; Fri, 14 Feb 1997 14:46:17 +-500 Message-Id: <01BC1A85.D5D1CBC0@aamirr> From: ARW <amirr(--nospam--at)paknet1.ptc.pk> To: "'seaoc(--nospam--at)seaoc.org'" <seaoc(--nospam--at)seaoc.org> Subject: Re: Isolated pad footings - To tie or Not to tie? Date: Fri, 14 Feb 1997 14:46:05 +-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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