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section properties

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section properties

  • Hi all,

    my query is regarding section properties.

     If i want to add a new section using modify section propeties,What all the parameters required? I am little confused how the coordinates are considered.what does ct,Zx,Zy values represent?If  Z is the major axis,There is no Zz value but Zx is given.

    kind regard,

    Babu

  • Hi Babu,

    Can you please let us know to which product your question refers?

    Thanks,

    Chris

  • hi chris,

    Sorry for not mentioning the software.I am using staad pro V8i. My query is regarding the section properties in staad.

    kind regards,

    babu 

     

  • Hi Babu,

    I see what you are referring to now in the Section Database Manager.

    Zx refers to the plastic section modulus about the strong axis.  STAAD refers to this as the z axis, AISC refers to it as the x axis.

    Zy refers to the plastic section modulus about the weak axis.  STAAD and AISC both refer to this as the y axis.

    I am not immediately able to correlate the value Ct with a section property in the steel manual, but I will look into it further and get back to you on that one.

    Cheers,

    Chris 

  • Zx is the plastic section modulus about the Z axis. Logically, this term should have been called Zz.
    Zy is the plastic section modulus about the local Y axis.

    If the section that you are trying to add is I-shaped, then, Ct is the distance along the local Y axis from the top of flange to the CG of a T-shape which can be cut from that I shape. If a T shape cannot be cut from that I shape, set Ct to zero.

    If the section that you are trying to add is a channel, then, Ct is the distance from the outer edge of the web to the CG of the section, along the local Y axis.

     

    Biswa

  • Thank you so much for your reply.

    For calculating the ct value,do we require to cut the secton at the centre of the I section?

    regards,

    babu

  • You asked :

    For calculating the ct value, do we require to cut the secton at the centre of the I section?

    Answer :

    Yes. Please see the attached figure.