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STAAD Commands and Input Instructions
Section 5
5-60
Tube
1) AX, 2 ) D, 3) WF, 4) TF, 5) IZ, 6) IY, 7) IX, 8) AY, 9) AZ
General
The following cross-sectional properties should be used for this
section-type. This facility allows the user to specify a built-up or
unconventional steel section. Provide both the Y and Z parameters
for design or code checking.
1) AX = Cross section area.
2) D = Depth of the section.
3) TD = Thickness associated with section element parallel to
depth (usually web). To be used to check
depth/thickness ratio.
4) B = Width of the section.
5) TB = Thickness associated with section element parallel to
flange. To be used to check width/thickness ratio.
6) IZ = Moment of inertia about local z-axis.
7) IY = Moment of inertia about local y-axis.
8) IX = Torsional Constant.
9) SZ = Section modulus about local z-axis.
10) SY = Section modulus about local y-axis.
11) AY = Shear area for shear parallel to local y-axis.
12) AZ = Shear area for shear parallel to local z-axis.
13) PZ = Plastic modulus about local z-axis.
14) PY = Plastic modulus about local y-axis.
15) HSS = Warping constant for lateral torsional buckling
calculations.
16) DEE = Depth of web. For rolled sections, distance between
fillets should be provided.
Note:
Properties PZ, PY, HSS and DEE must be provided for code
checking/member selection per plastic and limit state based codes
(AISC LRFD, British, French, German and Scandinavian codes).
For codes based on allowable stress design (AISC-ASD, AASHTO,
Indian codes), zero values may be provided for these properties.