I created a custom section within section wizard to simply find the torsional properties (torsional constant and warping constant) of a lower bridge chord which we are proposing to add additional weight to.
When I view the properties of the section I created, the only relevant property appearing is "Torsional moment of inertia". Is this program capable of determining the torsional constant and warping constant of the created section?
See below for printout.
Thank you
Section element
Rotation angle
Mirror
Material
E (kip/inch^2)
Sheet 24 x 0.5625
90.0
Steel
29732.747
Sheet 24 x 0.75
Sheet 16.5 x 0.4375
Sheet 3.5 x 0.625
360.0
Sheet 3.375 x 0.625
The overall dimensions of the section are 14 x 25 inch
Basic geometry of the section
Parameter
Value
A
Cross sectional area
94.62
inch2
a
Angle between Y-Z and U-V axes
-0.0
deg
Iy
Moment of inertia about axis parallel to Y passing through centroid
5535.21
inch4
Iz
Moment of inertia about axis parallel to Z passing through centroid
3435.18
It
Torsional moment of inertia (St. Venant)
11.87
iy
Radius of gyration about axis parallel to Y passing through centroid
7.65
inch
iz
Radius of gyration about axis parallel to Z passing through centroid
6.03
Wu+
Max elastic modulus about U-axis
442.82
inch3
Wu-
Min elastic modulus about U-axis
Wv+
Max elastic modulus about V-axis
486.4
Wv-
Min elastic modulus about V-axis
Wpl,u
Plastic modulus about U-axis
783.65
Wpl,v
Plastic modulus about V-axis
676.28
Iu
Moment of inertia about U-axis
Iv
Moment of inertia about V-axis
iu
Radius of gyration about U-axis
iv
Radius of gyration about V-axis
au+
Centroid to edge of compression zone along +ve U-axis
5.14
au-
Centroid to edge of compression zone along -ve U-axis
av+
Centroid to edge of compression zone along +ve V-axis
4.68
av-
Centroid to edge of compression zone along -ve V-axis
yM
Distance to centroid along Y-axis
7.06
zM
Distance to centroid along Z-axis
12.5
yP
Distance to equal area axis along Y-axis
32.06
zP
Distance to equal area axis along Z-axis
-40.1
What Section Wizard reports as Ix should be the torsional constant represented as J in the AISC 360-05/10 codes. The software does not report the warping constant.
Then what value it is using, how STAAD actually calculate warping constant from section wizard..