Drawback of refinement in a beam element
Drawback of refinement in a beam element
(OP)
Hi all,
i have a a 3 member frame an open rectangle(like a building frame).
In modelling the columns( vertical members) i use beam elements. one intresting thing is that , i can use only one beam element with 2 Dofs pernode( total of 2 nodes per element) to modell this . and thereby i can get the end moments. so total DOfs=2*2=4.
The same vertical memeber i can model using 10 beam elements with total Dofs=10*2=20.
although there is a refinement made i get the same value of the ened moments and reactions in modelling a vertical column frame member using beam elements.
1)why is it that we do not realize the effect of refinement in such a case??
2)does this always happen in a beam element. can u tell me a situation where in the effect of refinement is realized in the improved solution while using a beam element.
thanks for responses
regards
raj
i have a a 3 member frame an open rectangle(like a building frame).
In modelling the columns( vertical members) i use beam elements. one intresting thing is that , i can use only one beam element with 2 Dofs pernode( total of 2 nodes per element) to modell this . and thereby i can get the end moments. so total DOfs=2*2=4.
The same vertical memeber i can model using 10 beam elements with total Dofs=10*2=20.
although there is a refinement made i get the same value of the ened moments and reactions in modelling a vertical column frame member using beam elements.
1)why is it that we do not realize the effect of refinement in such a case??
2)does this always happen in a beam element. can u tell me a situation where in the effect of refinement is realized in the improved solution while using a beam element.
thanks for responses
regards
raj
Raj





RE: Drawback of refinement in a beam element
RE: Drawback of refinement in a beam element
As addition to his comment about the need to add interior nodes to the beam spans, i.e. increasing the number of the beam, is also to attach beam(s) correctly to the adjacent elements. E.g. you have a plate modeled with 10 shell elements in its long direction and you will model stringers attached to the plate in long direction with beams, then you should model the stringer with 10 elements, so that the nodes of the beams will coincident with the nodes of the shell elements.
Hope this will contribute to your problem.
regards