![]() ![]() The parallel axis theorem is used to determine the moment of inertia of composite sections. Sol: The given plate is symmetrical about the y-y axis, therefore \ = 150 mm. The moment of inertia of an area with respect to any given axis is equal to the moment of inertia with respect to the centroidal axis plus the product of the area and the square of the distance between the 2 axes. To find \, we have to divide the whole Figure into standard areas.Įxample: Find the moment of inertia of a plate with a circular hole about its centroidal x axis as shown in Fig.8. ![]() Sol: The given I-section is symmetrical about the y-y axis, therefore, = + Įxample: Determine the moment of inertia about the horizontal axis passing through the centroid of the section as shown in Fig.7. ![]()
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