Etabs modelling parameters
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Transcript of Etabs modelling parameters
ETABS MODELLING
AUTHOR: VALENTINOS NEOPHYTOU BEng (Hons), MSc
March 2013
ETABS MODELING PARAMETERS
Valentinos Neophytou BEng (Hons), MSc Page: 2 ETABS MANUAL
Description of elements type
Membrane element
• Ignore bending stiffness • Tension / Compression • In-‐ plane Shear • For in plane loads • Principle Stresses • suitable for very thin structures / members • Thin Walled Shells, • Specially Suitable for Ferro Cement
Structure
Plate
• Primarily Bending mode • Moment and Shear are predominant • Suitable for moderately thick slabs and
plates • For Out-‐of-‐plane loads only • Can be used in 3D or 2D models • Suitable for planks and relatively flat
structures
Shell
• Combined Membrane and Plate • Suitable for general application to surface
structures • Suitable for curved structures • Thick shell and thin shell implementations
available • Membrane thickness and plate thickness
can be specified separately • Numerous results generated. Difficult to
design the section for combined actions
Solid
ETABS MODELING PARAMETERS
Valentinos Neophytou BEng (Hons), MSc Page: 3 ETABS MANUAL
• Shear Axial deformation mode in 3D • Suitable for micro-‐models • Suitable for very thick plates / solids • May not be applicable much to
ferocement structures • Use 6 to 20 node elements
Analysis type according to FEA method Non linear analysis Dynamic analysis
• P-‐Delta Analysis • Buckling Analysis • Static Pushover Analysis • Fast Non-‐Linear Analysis (FNA) • Large Displacement Analysis
• Free Vibration and Modal Analysis • Response Spectrum Analysis • Steady State Dynamic Analysis
Non-‐linear response may be produced by:
– Geometric Effects (Geometric non-‐linearity)
– Material Effects (Material non-‐linearity)
– Both
The response is directly proportional to excitation (Deflection doubles if load is doubled)
ETABS MODELING PARAMETERS
Valentinos Neophytou BEng (Hons), MSc Page: 4 ETABS MANUAL
Results
Load transfer of slabs and beams
ETABS MODELING PARAMETERS
Valentinos Neophytou BEng (Hons), MSc Page: 5 ETABS MANUAL
Define slab
One way slab modelling can be use in the following case:
• By default use one-way load transfer mechanism • Generally used to model pre-cast slabs • Can also be simple RC solid slab