PUSHOVER ANALYSIS

[alessandro.paparo]

HI ALL!

I performed some pushover analysis for single frames from a 3D structure. In order to to the pushovere analysis I took the single frame, for the 3D model, and i did the analysis. I performed the static analysis usìng the gravity load one time using eleload and one time using nodal load. The 2 curves must to be very similar, but I saw too much difference...
the load was applied like that:
- for nodal load:
pattern Plain 1 "Linear" {
load 11 0 0 -46000 0 0 0
load 12 0 0 -46000 0 0 0
}
- for eleload:
pattern Plain 101 Linear {
eleLoad -ele 1112 2122 3132 4142 5152 6162 -type -beamUniform -19 0.
}



After i re-write the script in 2 dimensions space. This time the two pushover analysis gave to me good results. I used the same section, the difference is that in the second case i didn't use the command " section Aggregator". Furthermore, the difference is that in the first case i used a 3D definition (model BasicBuilder -ndm 3 -ndf 6), in the second case a 2D definition (model BasicBuilder -ndm 2-ndf 3).
Loads are the same, the only difference is in the definition of the DOF: for exemples:
- for nodal load:
pattern Plain 1 "Linear" {
load 11 0 -46000 0
}
- for eleload:
pattern Plain 100 Linear {
eleLoad -ele 1112 -type -beamUniform -$QdlBeam;
}


anyone can say to me where could be the problem in the first script?

thx very much!

ale[/img][/list][/url]

[fmk]

are you using the corotational formulation in the 3d case? check nodal reactions to see if the ele loads are actually being applied.