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Truss Design

 
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sidhudaljeet
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Joined: 26 Jan 2003
Posts: 110

PostPosted: Sun Nov 21, 2004 5:45 am    Post subject: Truss Design Reply with quote

Dear SEFIANS

In truss design, it is assumed that the Joints are Pinned hence designed for axial forces. But in real practice the joints are welded.  How should such change be incorporated in design.

Daljeet Sidhu




          
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mc.upadhyay1
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Joined: 26 Jan 2003
Posts: 134

PostPosted: Mon Nov 22, 2004 5:33 am    Post subject: Truss Design Reply with quote

Hello
you can design the truss assuming joints as rigid.
you will get some moments due to rigidity of joints in addition to
axial forces. so now you have to design the members for axial force &
moment.
i have designed the trusses like this.

regards

Mukesh Upadhyay





sidhudaljeet@yah                                                                                                
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cc:                                                                                    
11/21/04 11:04           Subject: Truss Design                                                            
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Dear SEFIANS

In truss design, it is assumed that the Joints are Pinned hence
designed for axial forces. But in real practice the joints are welded.  How
should such change be incorporated in design.

Daljeet Sidhu





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Robert.Nicolson at Sub...
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PostPosted: Mon Nov 22, 2004 9:32 am    Post subject: Truss Design Reply with quote

Dear Daljeet, the reason why Engineers model the truss as pinned,
even though the joints are fixed, is because, it is easier to
analyse by hand, i.e. manually ( if a determinate truss type is choosen,

i.e. so that each joint is determinate ).
If the truss members are arranged so that all intersecting members
nuetral axises are coincident, and also so that all forces are applied
at the truss joints, then the difference between the applied forces
in a pinned truss, or a fixed truss will be negligable.
You can proove this to yourself by making a computer model, and
changing the joints from pinned to fixed.
This is a typical trick that older Engineers are well aware of.

Rob.

-----Original Message-----
Message From  sidhudaljeet@yahoo.com [mailto:sidhudaljeet@yahoo.com]
Sent: 21 November 2004 11:16
To: Robert Nicolson
Subject: Truss Design





Dear SEFIANS

In truss design, it is assumed that the Joints are Pinned
hence designed for axial forces. But in real practice the joints are
welded.  How should such change be incorporated in design.

Daljeet Sidhu




          
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b.r.seshasayee at saip...
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PostPosted: Mon Nov 22, 2004 12:25 pm    Post subject: Truss Design Reply with quote

Hi
In a computer model , we define supports where the truss is actually supported.
The members can be specified as truss members which carry only axial forces or the moments can be released at the start and end node of the member. This type of modelling can be adopted when the members are connected at the CG of each and the loads are applied at joints only. This is applicable for bolted & welded connections.
If we do not specify the members as truss or do not release the moments of members , we will get axial forces and meagre moments in members which we can neglet for all practical purposes.
If loads are not applied at joints , the members will be subjected to axial forces and moments for which it has to be designed irrespective of joint connections.
Regs
B.R.Seshasayee

-----Original Message-----
Message From  mc.upadhyay@jil.co.in [mailto:mc.upadhyay@jil.co.in]
Sent: Monday, November 22, 2004 4:33 PM
To: Seshasayee B.R.
Subject: Truss Design

Hello
you can design the truss assuming joints as rigid.
you will get some moments due to rigidity of joints in addition to axial forces. so now you have to design the members for axial force & moment.
i have designed the trusses like this.

regards

Mukesh Upadhyay





sidhudaljeet@yah                                                                                                
oo.com                   To:      mc.upadhyay@jil.co.in                                                          
cc:                                                                                    
11/21/04 11:04           Subject: Truss Design                                                            
AM                                                                                                              
Please respond                                                                                                  
to general                                                                                                      








Dear SEFIANS

In truss design, it is assumed that the Joints are Pinned hence designed for axial forces. But in real practice the joints are welded.  How should such change be incorporated in design.

Daljeet Sidhu





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