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behaviour of truss elements
Posted: 01 Jul 2009, 09:13
by kargar
thanks for your response.when we use a truss element,does it mean that this element can buckle or it works in compression as it works in tension?
Re: behaviour of truss elements
Posted: 02 Jul 2009, 00:41
by seismosoft
Tension and compression response of truss elements is identical. If you wish to model buckling, you should introduce introduce initial imperfections together with a relatively refined meshing (e.g. 4 elements) of the member.
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Re: behaviour of truss elements
Posted: 14 Jul 2009, 02:35
by seismosoft
quote:Originally posted by kargar
when i define truss element,it becomes unavailable to subdevide it into smaller parts.i need to use different materials along braces.can you help me how i can have a brace which consists of more than one part.so that i can define different materials for those parts
Dear Kargar,
Subdivision of truss elements is obviously not possible, given the difficulty of achieving structural equilibrium with pinned elements placed in series. Use frame elements with hinges at the edge of the end elements instead.
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Re: behaviour of truss elements
Posted: 14 Jul 2009, 02:43
by seismosoft
quote:Originally posted by kargar
as it is stated in help we can use it by link elements.in order to make a hinge i defined a link element with elastic behaviour for all of its degrees of freedom. i used 0.001 for M2 and 1e10 for other directions(in KN and m units).unfortunetly after doing so i understood that moment happened in my braces.i need a brace which works like a truss element but consists of some parts.can you help me?
If you have no distributed loads and no moment continuity in your elements, you cannot develop moments. Please check your model carefully for errors.
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Re: behaviour of truss elements
Posted: 21 Apr 2013, 17:44
by davoud.nezamolmolki@gmail
quote:Originally posted by seismosoft
Tension and compression response of truss elements is identical. If you wish to model buckling, you should introduce introduce initial imperfections together with a relatively refined meshing (e.g. 4 elements) of the member.
Seismosoft Support
hi
how we can introduce initial imperfections to consider buckling?
thanks
Re: behaviour of truss elements
Posted: 21 Apr 2013, 19:15
by seismosoft
Carry out a search in this Forum for the word "buckling", and you will find plenty of posts on this topic.
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