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Recent content by NTCONLINE

  1. NTCONLINE

    AS3600-2018 Amendment 2 - possible error

    Thanks again Gill, With your explanation about the substitution Vus = V* - phi Vuc, then it makes sense, mathematically, with the new eq 8.2.7(2) Without your explanation, as in the case that lots of engineers won't know, I believe it doesn't make any sense to take the sum of design action...
  2. NTCONLINE

    AS3600-2018 Amendment 2 - possible error

    Thanks, Rapt, But could you please confirm again that in the equation 8.2.7(2) it is +phiVuc instead of -phiVuc? Also, what is the implication for the RC column design? Would the users of the standard have to exclude the longitudinal area for shear/torsion, and then, the remaining...
  3. NTCONLINE

    AS3600-2018 Amendment 2 - possible error

    Hi everyone, You are probably aware that AS3600 amendment 2 was released end of May (1 month ago) with a significant change in the Shear section. 1. Could anyone please let me know if the V* used in the shear clauses 8.2.1.6 and 8.2.3.1 is now just pure shear (i.e. not the equivalent shear...
  4. NTCONLINE

    How does Etabs calculate maximum drift for semi-rigid diaphragm?

    Hi, Each floor consists of many FE nodes, each node has its own deflection value. So how does Etabs calculate the maximum story drift automatically? does it choose the node that has the maximum deflection at each floor? I believe for rigid diaphragm, the calculation is simply based on the...
  5. NTCONLINE

    Capacity reduction factor in new AS3600-2018

    Hi Doug, The problem is that a column can be classified as slender in one load case but short in some other load cases. I used to plot an interaction diagram (i.e phiMoment vs phiNu)and then plot all load cases to see if they are well within the curve. It seems I can't do this anymore unless...
  6. NTCONLINE

    Capacity reduction factor in new AS3600-2018

    Hi, Does anybody realise that in Table 2.2.2 (AS3600-2018) that the reduction factor for bending and axial compression is mathematically a function of ∅o - which is not a constant? And for a concrete column ∅o = 0.65 for short columns or ∅o = 0.6 for slender ones. However, when I look at the...
  7. NTCONLINE

    AS3600-2018 Shear Capacity: General Method vs Simplified

    Hi Steveh49, Thank you for uploading your spreadsheet. My personal experience is that for slab design, the simplified method is way too conservative. I haven't tried it for the beam yet. I will go through your spreadsheet and give a deep dive into it. However, at first glance, I did realise...
  8. NTCONLINE

    How to calculate punching shear stress?

    Rapt, I agree that we should be able to calculate the Polar Moment of Inertia of the shear plane for any shape. However, the textbook calculations usually assume the axis of torsion is perpendicular to the section. So I am quite unsure for the case where the axis of rotation is not...
  9. NTCONLINE

    How does SAFE calculate punching shear stress for circular column?

    Hi, for ACI 318, NZS 3101, IS456 codes, the procedure for calculation of the maximum punching shear stress involves Ixx, Ixy, and Iyy. Safe Techincal Note (link below) sets out the procedure to calculate the above parameters, but only for sections parallel to X or Y axis...
  10. NTCONLINE

    How to calculate punching shear stress?

    Hi, I've found this document from CSI SAFE software, set out the procedure to calculate punching shear stress that involves unbalanced moments. https://files.engineering.com/getfile.aspx?folder=c419601b-2127-45bf-b59a-e6c762f73fff&file=ftn01-03.pdf but it has limitations that the shape of the...
  11. NTCONLINE

    Mistakes in the newly arrived AS3600-2018

    hi RAPT, is it worth doing a design with the current AS3600-2018 amendment 1, or just wait? Do you know whether the coming Build Code will enforce the use of this AS3600-2018 in May?
  12. NTCONLINE

    Mistakes in the newly arrived AS3600-2018

    Amendment 1 has come out since last week.
  13. NTCONLINE

    Typo in AISC design column base plates document ?

    Dear jimstructures and Ingenuity, Thank you very much for this information. This has caused me trouble the last couple of days and thank you for providing me with the definite answer! Regards NTC
  14. NTCONLINE

    Typo in AISC design column base plates document ?

    Dear colleagues, I am reviewing a published document about Base Plate Connection design by AISC, the URL of the document is below http://www.construccionenacero.com/sites/construccionenacero.com/files/u11/ci33_321_aisc_design_guide_1_-_column_base_plates_-_2nd_edition.pdf I have a question...
  15. NTCONLINE

    Mistakes in the newly arrived AS3600-2018

    Rapt, do you have any estimated date for the amendments?
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