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RE: Tension only thrust restraint[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Tension only thrust restraint
- From: "Horning, Dick/CVO" <dhorning(--nospam--at)CH2M.com>
- Date: Fri, 9 Oct 1998 10:14:54 -0600
See below -----Original Message----- From: Bill Sherman [SMTP:SHERMANWC(--nospam--at)cdm.com] Sent: Friday, October 09, 1998 8:57 AM To: seaint(--nospam--at)seaint.org Subject: Tension only thrust restraint I have a pipe thrust restraint problem which I could use some advice on. I have 21 kips of pipe thrust 20 feet above grade, which I would like to resist by use of a 30-ft long horizontal cable or rod from a vertical pipe support back to a building structure. I am trying to avoid thrust at the vertical pipe support since its support structure below is not adequate to carry the base reactions if the thrust is included. I was thinking of using a cable - but in order to minimize cable sag as well as minimize pipe movement under load, I would need to pretension the cable. But this in turn puts a horizontal load on my vertical pipe support when there is no pipe thrust, which is the same as what I was trying to avoid in the first place. So does anyone know of a way to resist such tension due to thrust without inducing tension due to the catenary effect? Would a steel rod act much different from a steel cable? For 30' span, probably not (Section properties of a rod are so low). Sounds like you need a horizontal stiffleg. What about a pipe sized to span 10' unsupported, and a 4-way queen post arrangement at the 1/3 points of the distance, similar to what I've seen done with long spans of pneumatic conveyors?
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