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Very Fundamental Question

 
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shankarciv
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Joined: 26 Jan 2003
Posts: 4

PostPosted: Sun Nov 12, 2006 6:39 am    Post subject: Very Fundamental Question Reply with quote

Hello:

A hinged support is one which gives reaction in both horizontal and vertical direction?That means at the location we have the hinged support there is no vertical translation nor any horizontal translation.Right?

But, the members of a truss are assumed to be connected by frictionless hinges.Right?But, there the hinge can translate vertically or horizontally.Right?But, this is contradictory to the assumption  in case of a hinged support as mentioned above???Why??
Please help!! 

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mkalgal
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Joined: 26 Jan 2003
Posts: 54

PostPosted: Mon Nov 13, 2006 4:46 am    Post subject: Very Fundamental Question Reply with quote

Dear Shankar,
This has reference to your query on hinged support and hinged joint of
a truss. One is a hinge which is supported and the other is not
supported. Since the hinge at a support is "fixed" to the support, it
would not allow any translation. At a "roller-hinge" end also we have
a hinge but it will allow translation in one direction isn't it?
Regards
Kalgal

On Sun Nov 12 12:09:53 2006, shankarciv[AT]red...
<shankarciv[AT]red...> wrote:
Quote:
Hello:

A hinged support is one which gives reaction in both horizontal and vertical
direction?That means at the location we have the hinged support there is no
vertical translation nor any horizontal translation.Right?

But, the members of a truss are assumed to be connected by frictionless
hinges.Right?But, there the hinge can translate vertically or
horizontally.Right?But, this is contradictory to the assumption  in case of
a hinged support as mentioned above???Why??
Please help!!



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anurag.sinha
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Joined: 26 Jan 2003
Posts: 53
Location: New Delhi

PostPosted: Mon Nov 13, 2006 5:30 am    Post subject: Very Fundamental Question Reply with quote

The answer is also "Very Fundamental"

But the support can also sink and sway at the same time. Right?
Nothing is rigid, even the earth and the solar system is in motion.

shankarciv[AT]red... wrote:
Quote:
Hello:

A hinged support is one which gives reaction in both horizontal and vertical direction?That means at the location we have the hinged support there is no vertical translation nor any horizontal translation.Right?

But, the members of a truss are assumed to be connected by frictionless hinges.Right?But, there the hinge can translate vertically or horizontally.Right?But, this is contradictory to the assumption  in case of a hinged support as mentioned above???Why??
Please help!!


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dbhanuprasad
SEFI Regulars
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Joined: 26 Jan 2003
Posts: 23

PostPosted: Mon Nov 13, 2006 3:17 pm    Post subject: Very Fundamental Question Reply with quote

The support is assumed to be rigid and hence the support displacements
are assumed as zero. If the support is not rigid and it sinks or sways
the magnitude of the sinking/swaying shall be considered in the
analysis of structure. The structure becomes indeterminate and
normally such structures are analysed using structural analysis
softwares.

The effect of earth or solar system moving is negligible on the
building structures both from the size and loads (which are due to
gravity) consideration.

On Mon Nov 13 11:00:40 2006, anurag.sinha[AT]eil...
<anurag.sinha[AT]eil...> wrote:
Quote:
The answer is also "Very Fundamental"

But the support can also sink and sway at the same time. Right?
Nothing is rigid, even the earth and the solar system is in motion.

shankarciv[AT]red... wrote:
Hello:

A hinged support is one which gives reaction in both horizontal and vertical direction?That means at the location we have the hinged support there is no vertical translation nor any horizontal translation.Right?

But, the members of a truss are assumed to be connected by frictionless hinges.Right?But, there the hinge can translate vertically or horizontally.Right?But, this is contradictory to the assumption  in case of a hinged support as mentioned above???Why??
Please help!!

MAIL HAS BEEN SCANNED BY MACFEE



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