The I-section is preferred to the rectangular section for resisting bending moment (bm) because, in the i-section, more than 80% of the bending moment is resisted by the flanges themselves! I-section has a higher moment of resistance (more) because the areas of flanges are away from the neutral axis (n.a.)
Why Are I Beams Used Instead of Rectangular Beams?
I-beams, also known as H-beams, are a type of structural beam used for various construction projects. They are typically made from steel and are an efficient and cost-effective way to create a strong and durable structure. I-beams are often used instead of rectangular beams due to their unique shape and properties.
Its strength-to-weight ratio is the primary benefit of using an I-beam instead of a rectangular beam. I-beams are made of steel, a solid material, yet it is also lightweight, making it perfect for various applications. With its unique shape, it can also be used to create a structure that is more structurally sound than a rectangular beam.
The shape of I-beams also makes them better suited for specific applications than rectangular beams. For example, I-beams are often used as support beams in construction projects, as they can carry a more significant load than rectangular beams. This makes them ideal for bridges and other structures requiring much support. In addition, the angled sides of an I-beam provide additional stability, making them less likely to bend or break.
I-beams are also much more versatile
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