MOMENT OF INERTIA CALCULATION FOR Z SECTION

[sivasooriyan]

I need to calculate the Moment of Inertia(Ixx, Iyy) Section modulus (Zxx, Zyy) & Radius of Gyration for 'Z' Section with lid (attached).
Kindly share the detail

 

[rb1957]

I suspect this should more properly be in the student forum. Calculating section properties should be easy, or can be picked up from any "strength of materials" text.

not sure what you mean by "with lid" ? ... the section is a typical Zed section with lips.

"radius of gyration" ... about the z axis ?

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

 

[JStephen]

Generally built up from combination of rectangles and partial circles with parallel axis theorem.
Bend radius can be included or treated as a square corner depending on accuracy needed.
For torsional properties of thin-walled sections, see Roark.

 

[bones206]

https://scholarsmine.mst.edu/cgi/viewcontent.cgi?article=1159&context=ccfss-aisi-spec

page I-50

 

[JStephen]

You can also draw it in AutoCAD, turn it into a region, then use mass properties. But I like to have some way to check this stuff, too.

 

[271828]

The equations for a lipped zee are in the AISI Manual volume 1.

 

[rb1957]

I'd prefer to learn the general approach, rather than a slew of specific cases.

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.