Complex model in ETABS
Complex model in ETABS
(OP)
"Hello,
We want to model a very complex 3d structure. Its having variable heights of floors. So we cannot intersect our building with etabs story lines. Additionaly, the model will be imported from 3d CAD in one go. So we have decided to define a single story height of lets say 20m in ETABS and import 3d CAD in this space and provide reference levels and make custom elevations to work in ETABS. Can we define diaphragms using reference levels...assigning different diaphragms to different levels? and will it effect the analysis results? Is this approach ok as far as ETABS modelling capacity is concered?"
We want to model a very complex 3d structure. Its having variable heights of floors. So we cannot intersect our building with etabs story lines. Additionaly, the model will be imported from 3d CAD in one go. So we have decided to define a single story height of lets say 20m in ETABS and import 3d CAD in this space and provide reference levels and make custom elevations to work in ETABS. Can we define diaphragms using reference levels...assigning different diaphragms to different levels? and will it effect the analysis results? Is this approach ok as far as ETABS modelling capacity is concered?"





RE: Complex model in ETABS
Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis
http://www.engissol.com/cross-section-analysis-des...
RE: Complex model in ETABS
You can check K factors for your columns, but there should not necessarily be a problem with buckling lengths using your approach. Buckling lengths can be assigned by the user using the Design menu. Earthquake results should not be affected, since they are based on mass distribution.
If it's an irregular structure, you may want to assign a "semi-rigid" flexible diaphragm. In addition to giving you more realistic reactions, you can also get axial forces in beams, something that cannot be done with a rigid diaphragm
RE: Complex model in ETABS
RE: Complex model in ETABS
RE: Complex model in ETABS
Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis
http://www.engissol.com/cross-section-analysis-des...