RE: [PipingDesign] Struts

From: <Geoff>
Date: Wed Sep 24 2003 - 00:36:00 EDT

Hi Steve,

A good reference is the software that can be downloaded from www.lisega.de if you cant get hold of the lisega manual.

Geoff
--- Steve McKenzie <Mechproj@xtra.co.nz> wrote:



You may want to take the time to look at the site yourself as the information you request is already there in the downloadable files.

Yes they are struts and as such are designed for compressive loads.

For tension loads you do not need a strut; a hanger is sufficient. Hangers
do not all have springs. Hangers with springs are normally called, strangely
enough, spring hangers. Some hangers are nothing more than threaded rod.
Have a look at "Piping Guide" fig 2.72A if you want to see the various types
of hanger.

They even give a table for load reduction ratings at various slenderness
ratios (lengths). There is a photograph showing two struts, in compression
supporting, a pipe and the installation section shows a number of proposed
configurations both in compression and tension.

Remember a strut is primarily for compression loading. Most struts will work
equally well as hangers (tension) but cost more.

Cheers

Steve McKenzie

-----Original Message-----
From: Tushar Rajyaguru [mailto:trajyagu@ltcis.ltindia.com] Sent: Wednesday, September 24, 2003 3:40 PM To: piping design
Subject: RE: [PipingDesign] Struts

No, no. Not the hanger actually. Hanger has spring inbetween and not the
rigid body and used to take only verical loads. Its also not same as hanger
rod. Struts can be used even as guide or axial stops. For better understanding you may refer some catelog of pipe support manufacturer or may
visit www.lisega.com



"NO EFFORT IN LIFE GOES UNPAID, HENCE GO AHEAD"

Tushar K. Rajyaguru
Plant & Piping Engineering,
Larsen & Toubro - Chiyoda Ltd.,

Aha

I think its just words. What you call a strut I call a hanger. Every book I

have including the dreaded "piping guide" refers to struts as being

primarily compression loaded.

If you call a tension member a strut, there will be a lot of confusion.

A member designed for tensile load can be also loaded in compression but the

capacity is normally much lower.

It would be dangerous to assume that a member rated for a tensile load can

carry the same load in compression. With ductile members that have a high

moment of inertia compared to their length (short and fat) then the

difference may be small. However if long and thin, as many pipe hangers are,

then buckling may occur.

You need to work it out i.e. do the sums.

Cheers

Steve McKenzie

-----Original Message-----

From: Tushar Rajyaguru [mailto:trajyagu@ltcis.ltindia.com]

Sent: Wednesday, September 24, 2003 1:03 AM

To: piping design

Subject: RE: [PipingDesign] Struts

Hi Steve,

I am bit confused and I think I am misunderstood. My query is about strut

support and not Column/strut (structural members). The strut support

consists of rigid body with ball bushing joint as a connection at both the

ends. One end is connected with pipe with clamp and other with the

structure. Normally Struts have very high load bearing capacity.

Hi Tushar Rajyaguru

A strut is by normal definition a compression member. Same as a column. If

you have only used tension members, there is a bit more work involved in

strut design. You need to consider end conditions and analyse for buckling.

Also struts do not like eccentric loads, so avoid where you can. They are

fairly well covered in most textbooks although the end conditions/degree of

fixity when is used to estimate the equivalent length can take some time.

Transverse loads also need to be taken into account e.g. seismics, wind etc.

They can have a big influence as they induce a moment the same as an

eccentric load does.

Cheers

Steve McKenzie

-----Original Message-----

From: Tushar Rajyaguru [mailto:trajyagu@ltcis.ltindia.com]

Sent: Wednesday, September 24, 2003 12:14 AM

To: piping design

Subject: [PipingDesign] Struts

Dear Friends,

We are planning to use strut in one piping system. My query is whether strut

can take compressive load ? Generally we have used it in tension only.


"NO EFFORT IN LIFE GOES UNPAID, HENCE GO AHEAD"


Tushar K. Rajyaguru

Plant & Piping Engineering,

Larsen & Toubro - Chiyoda Ltd.,

[Non-text portions of this message have been removed]


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