Second Moment of Area Example 4 (I beam)

The video tutorial demonstrates how to calculate the second moment of area for an I-beam about the X-axis at the centroid. The instructor advises against using calculus due to the complexity of the shape and instead recommends using formulas for rectangles and the parallel axis theorem. The I-beam is deconstructed into three rectangles, and the second moment of area is calculated for each, then summed to find the total. The final result is presented in millimeters to the fourth power.

What is the definition of the second moment of area?

Explain why the integral method is not recommended for finding the second moment of area for the given shape.

What formula is used to calculate the second moment of area for a rectangle at its centroid?

Describe the parallel axis theorem and its application in this context.

What is the significance of the D value in the parallel axis theorem?

How is the second moment of area calculated for the green rectangle in the I-beam?

Summarize the steps taken to find the second moment of area for the I-beam.