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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: Dave Handy <dhandy(--nospam--at)trg.ca>
- Date: Fri, 9 Oct 1998 12:25:52 -0400
Depends on the diameter of the rod. The rod has to become quite large in order to minimize the horizontal load effects. The rods can be treated as beams or cables. A small diameter rod will deflect so much under self wieght that it will act like a cable and those equations can be used (structural eng handbook Gaylord, et al 1997 p.27-4). Tension =(QL^2) (1+16(F/L)^2)^0.5 / (8F) Q IS UDL L IS HORIZONTAL LENGTH F IS VERTICAL SAG As deflection approaches that of a beam then the tension effects will be reduced greatly. Hope that helps! David Handy, P.Eng The Thompson Rosemount Group Cornwall, Ontario, CANADA dhandy(--nospam--at)trg.ca The preceding was an off the record personal opinion only! (cya) -----Original Message----- From: Bill Sherman [SMTP:SHERMANWC(--nospam--at)cdm.com] Sent: October 09, 1998 11:57 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?
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