Uploaded on
30 Jan 2023
Skill-Lync
This article explains the step-by-step procedure for finding the Moment of Inertia for different sections using AutoCAD to input these values in general sections properties of STAAD.Pro or any other analyzing software. It is usually done to import the real geometry of the section that can’t be modelled in analysis software. In all software, a separate tool is developed to create asymmetrical /irregular sections.
The ability of a cross-section to resist bending is referred to as the moment of inertia (I). It is usually considered in relation to a reference axis like X-X or Y-Y. It is a mathematical characteristic of a section that has to do with the distribution of a surface area around the reference axis (axis of interest). Typically, a centroidal axis serves as the reference axis
Following are the step-by-step procedures to find a Moment of Inertia in AutoCAD:
Cross checking the above term with manual calculations as follows,
Ixx = bd
3 / 12 = 600x300
3 / 12 = 1350000000 mm4
Iyy = db
3 / 12 = 300x600
3 / 12 = 5400000000 mm4
Results from manual calculation & AutoCAD-based results show the same value.
Explaining one more example with hollow Square section to compare the result of Moment of Inertia between AutoCAD & Online Moment of Inertia calculators.
To calculate the Moment of Inertia for the hatched portion, the following steps are to be followed,
So, based on the above methods, the Moment of Inertia can be checked for analysis. Inputting the above-calculated value in Staad Pro > Properties > Definitions > General
Where,
AX - Area of the section (from AutoCAD)
IX - Moment of Inertia in X direction (from AutoCAD)
IY - Moment of Inertia in Y direction (from AutoCAD)
IZ - IX + IY
Author
Navin Baskar
Author
Skill-Lync
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