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  1. Trenno

    ETABS User Wind Loads on Semi-Rigid Diaphragms

    It's wild that ETABS isn't set up for something so common (any tower with a set of a wind tunnel point loads).
  2. Trenno

    ETABS User Wind Loads on Semi-Rigid Diaphragms

    I posted something similar a few years ago. Might be of use. Link
  3. Trenno

    Simple way to get total force transferred from walls to diaphragms (RSA)

    How about the step in the shear force diagram for the wall pier is equal to the diaphragm shear being delivered at that level?
  4. Trenno

    Etabs Shell joints

    It's due to how the calculation approximations work (very soft springs at each node) associated with the Non-iterative Based on Mass P-Delta option. Suggest adopting the proper iterative P-Delta setting .
  5. Trenno

    Etabs wall-column modelling

    Is the case that some of the vertical load is bleeding into the return walls also, which is what I'd expect to happen with a two-storey box.
  6. Trenno

    ETABS Semirigid Diaphragm No Axial Loads on Braced Frame Beams

    Try modelling it as a normal slab shell with reduced bending stiffness.
  7. Trenno

    ETABS Semirigid Diaphragm No Axial Loads on Braced Frame Beams

    What have you modelled the slab as? Shell or membrane?
  8. Trenno

    Shear Wall Design Inadequacy in ETABS

    The summary is a different set of loads to the original screenshot. Anyway this pier isn't failing in flexure anymore but the boundary elements seem to be going over the limit (0.20*Fck). The pier is running at around 3MPa shear, which is quite high. I suggest reading up on the backstay...
  9. Trenno

    Shear Wall Design Inadequacy in ETABS

    Need more information... What's the pier size? strength? expected rebar? But looking at your loads - you've got tension and major axis bending. Plotting the interaction diagram, your bending capacity is hindered once the section goes into tension. Your pier is also failing in shear. Also, the...
  10. Trenno

    Spring in compression vs reaction

    Perhaps post some screenshots of your area spring reactions with varying spring stiffness?
  11. Trenno

    Virtual Work Diagrams

    Thanks Celt, I came across it when I was researching this. Surely other people have used this method and have some opinions on the above queries?
  12. Trenno

    Virtual Work Diagrams

    I have only recently started to investigate the Energy/Virtual Work Diagrams feature within ETABS. I'm curious how many others are using it to assess lateral stability systems? Few initial thoughts: - Would there be any benefit if CSI broke down each degree of freedom (ie axial deformation...
  13. Trenno

    Modelling and design of basement walls

    ETABS will report and design for out of plane forces (V33 and M22) for defined piers.
  14. Trenno

    BMD of the beam joined at intersection

    You can... if you release the major axis bending within the shorter beam at junction of the longer beam.
  15. Trenno

    Retaining Wall Design with ETABS & SAFE?

    You can automesh shells and apply non-linear compression springs in ETABS. View the bearing pressure plots under Display > Force/Stress Diagrams > Soil Pressure... I'm fairly sure slab design (strip based approach) is included in the standard version (not Ultimate) of ETABS these days.
  16. Trenno

    Retaining Wall Design with ETABS & SAFE?

    It might be worth posing a similar question to the Earth Retention sub-forum. There may be more suitable 3D FEA software. CSI are slowly phasing all SAFE features into ETABS to create the one-stop shop. At present, I think you can achieve everything you mention above within ETABS. In regards...
  17. Trenno

    Shear Wall Design in ETABS - Uneconomical

    What a terribly vague question, but I'm going to take a stab in the dark and guess that the speaker was referring to uniformly reinforced shear walls (ETABS default?) vs clustered end reinforced shear walls. You could make the argument uniformly reinforced walls are not as efficient, because...
  18. Trenno

    ETABS: Draw L-shaped column

    What is the size of the column? ie, thickness and length of each leg that make the L shape?
  19. Trenno

    ETABS: Draw L-shaped column

    Draw two walls to make the L Shape? Assign each wall a single pier label for forces?
  20. Trenno

    ETABs API - Steel Beam Design Shear Reactions

    ETABS lacking practicality... Well I never!

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