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  1. PicoStruc

    ETABS: Seismic storey response plots do not match base reactions?

    The base reaction moment are calculated about X=0,Y=0,Z=0 Zeros coordinate. This is not overturning moment of the building.
  2. PicoStruc

    ETABS v18 Released

    So if I understand correctly, we cannot edit joint coordinate using table anymore ? What a mess !
  3. PicoStruc

    RISA modeling ? - load going through diagonal bracing, not columns

    you are all aware that the load in the brace are negligible -> 0.01 seems ZERO to me !
  4. PicoStruc

    High-rise Lateral Resisting Systems

    Always find these kind of thread really scary !
  5. PicoStruc

    Lap lengths in columns

    I think the real question is to put compression or tension lap splice. I my opinion, Tension lap is required to be able to develop moment resistance for lateral displacement capacity (Seismic / Wind)
  6. PicoStruc

    Stud Rail Stud Height Shorter Than Specified

    Very good question ! I am pretty sure that the answer to that question is linked to the ability for shear cracks to develop above shear head. On other hand, with spacing reducted and diameter increased, the calculated resistance is doubled compared to the original design. BUT : Does the...
  7. PicoStruc

    Usage of shearheads in flat slabs

    Only Headed Reinforcements (Studs) and Stirrup reinforcement are covered by canadian CONCRETE code, thus the difference in reinforcing wording definition.
  8. PicoStruc

    Usage of shearheads in flat slabs

    FYI It's quite common in new building in canada. Here Shearhead means "stud-rail reinforcement AROUND column" NOT "embedded steel profiles in slab joint.
  9. PicoStruc

    I have a BS and MS in math. Want to become a PEng. in Canada. BEng or MEng?

    moltenmetal is right... But in theory, because the engineering act is done a non-engineer, it must be supervised all along...
  10. PicoStruc

    Shear Wall Without Shear

    Just saying but wind and seismic loads are reversal loading. The accidental torsion may happen on both side of the center of mass, causing reversal of torsion component ! So, in my opinion, it is not possible to have a monolotic wall taking no shear at all in a design point of view. EDIT : In...
  11. PicoStruc

    Modal Analysis - Torsional Mode

    It is somewhat difficult to change torsional behavour of building without argument with archtects because of shear wall requirement. Anyways, dynamic analysis are required for torsional building (WTF Would you really design high rise with statis equavalent procedure, Come on !?) In my opinion...
  12. PicoStruc

    Interaction Diagrams - Buckling and Shearwalls

    Local buckling of thin wall segment of shear wall are covered in code by requiring minimal thickness calculated as a fraction of the net wall story height. Note that seismic clause requires thickier wall than usual shear wall.
  13. PicoStruc

    Interaction Diagrams - Buckling and Shearwalls

    The slenderness/buclkling check is assured with minimal moment M2 requirements. Also by calculating the amplification factor 1/(1-pf/(p_euler))­, you can see how sensitive to buckling your columns are In reinforcing concrete, you generally increase resistance by adding rebars without...
  14. PicoStruc

    Architectural steel mesh wind loads

    Where I live, we suppose that it's full of ice, so no wind pass through !
  15. PicoStruc

    is hilti anchor bolts capacity software reliable?

    I fully agree here. A lot of engineer were badly applying correction factors such as edge factor using table when calculating resistance manually. The result is when using the software, resistance of often so much lower than (wrongly) expected. Note that the LRFD transition to anchorage bring...
  16. PicoStruc

    Compressive axial force across section resulting in increased flexural rigidity

    I might be stupid... But in my opinion, Tension increase geometric rigidity and compression lower geometric rigidity ! For example, considering P-Delta / p-delta effect in analysis will increase the period of a building because all column and walls are in compression !
  17. PicoStruc

    SAP2000 Acceleration User-Defined Dead Loads

    it's the mass that get accelerated. Not the Weight. Validate that your mass source is well defined.
  18. PicoStruc

    Fig I-8, NBCC

    Jayrod, I agree with you. I read too fast, I missed the word "tributary". I have the french version where the word "Design" is replaced by "Theorical" due to translation. If you miss the word tributary, the sentense can be intrepreted as "The theorical surface within he specified zone" My...
  19. PicoStruc

    Fig I-8, NBCC

    Are you sure Jayrod ? For me it seem it really mean the area of zone E ou W !
  20. PicoStruc

    Consideration of Slab’s Bending Resistance to the Lateral Load Resistance of a Rigid Frame

    Canadian code recommand to use 80% reduction in bending stiffness in modelling. Slab Diaphragm act as membrane in the lateral load path.

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