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Etabs modelling parameters

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Description of shell, plate, membrane and solid elements.

Description of shell, plate, membrane and solid elements.

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  • 1. ETABS  MODELLING                 AUTHOR:  VALENTINOS  NEOPHYTOU  BEng  (Hons),  MSc     March  2013  
  • 2. ETABS MODELING PARAMETERS   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   Valentinos Neophytou BEng (Hons), MSc   Page: 2 ETABS MANUAL    
  • 3. ETABS MODELING PARAMETERS   • 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   • Free  Vibration  and  Modal  Analysis   • Buckling  Analysis   • Response  Spectrum  Analysis   • Static  Pushover  Analysis   • Steady  State  Dynamic  Analysis   • Fast  Non-­‐Linear  Analysis  (FNA)   • Large  Displacement  Analysis                 Non-­‐linear  response  may  be  produced  by:   The  response  is  directly  proportional  to     excitation   – Geometric  Effects    (Geometric   (Deflection  doubles  if  load  is  doubled)   non-­‐linearity)   – Material  Effects  (Material  non-­‐ linearity)   – Both                     Valentinos Neophytou BEng (Hons), MSc   Page: 3 ETABS MANUAL    
  • 4. ETABS MODELING PARAMETERS    ResultsLoad transfer of slabs and beams   Valentinos Neophytou BEng (Hons), MSc   Page: 4 ETABS MANUAL    
  • 5. ETABS MODELING PARAMETERS    Define slabOne 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   Valentinos Neophytou BEng (Hons), MSc   Page: 5 ETABS MANUAL    

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