The above equation may look familiar, as it is a slight variation on the parallel axis theorem. To calculate the moment of inertia of such a beam, it is necessary to split it into two identical pieces and sum the individual moments of inertia about the centroid of the complete structure, using the following equation: Double T Beam Moment Of InertiaĪ double T beam is made up of three plates, as shown in the following figure: Using the same T beam, the moment of inertia about the y-axis is as follows: Extension Of T Beam Moment Of Inertiaīeginning with the moment of inertia of a T beam, there are further extensions, which are introduced below. Therefore, the moment of inertia of section A is calculated as follows:Īnd the moment of inertia of section B is calculated as follows:įinally, adding the two together, the total moment of inertia of the T beam is calculated as follows: Example Calculation To calculate the moment of inertia of a T beam about its y-axis, the beam must again be divided into two sections, as follows:
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