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sidhudaljeet ...
Joined: 26 Jan 2003 Posts: 110
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Posted: Sun Nov 21, 2004 5:45 am Post 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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mc.upadhyay1 ...
Joined: 26 Jan 2003 Posts: 134
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Posted: Mon Nov 22, 2004 5:33 am Post subject: Truss Design |
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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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Robert.Nicolson at Sub... Guest
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Posted: Mon Nov 22, 2004 9:32 am Post subject: Truss Design |
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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
---------------------------------
Discover all that's new in My Yahoo!
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b.r.seshasayee at saip... Guest
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Posted: Mon Nov 22, 2004 12:25 pm Post subject: Truss Design |
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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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