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Daily Digest Sat Nov 22 23:00:01 2003

 
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er_spsvasan
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 16

PostPosted: Mon Nov 24, 2003 1:22 am    Post subject: Daily Digest Sat Nov 22 23:00:01 2003 Reply with quote

Hello M.C Upadyay,

It is customary to provide long slots in base plates at one end of the trusses.. This type of support is not a true roller support. But it is believed that, for slowly developing forces, such as due to temperature effects, the long slots will permit relative movement between truss and base plate. Thus, the truss is supposed to be relieved of temperature stresses. Under quickly developing forces, as due to wind or due to crane movements, sliding is not easily permitted and hence there can be transmission of such horizontal forces at both supports.

I would like to know from our colleagues whether there had been any practical observation or experimental work to verify the above assumptions.

Regards

S.P.Srinivasan
general@sefindia.org wrote:----------------------------------------------------------
From: mc.upadhyay@jil.co.in
Subject: Assumption in the Design of Column supporting Roof Truss
Date: 22/11/03 Time: 17:10:23
----------------------------------------------------------
Hello all
We design the trusses by assuming the support conditions
as one end pinned & other roller.
If we design the columns, by assuming tied together at top by trusses
thus having the cantilever deflection of all the columns at top to be equal.
(As suggested by SP 38 too)
My question is how the truss will be able to transfer hor. force to the columns as one end of the truss is considered to be roller.
It can transfer hor. force to the col. at the end, which is considered as pinned.

Regards
----------------------------------------------------------

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