What is the difference between an I-section beam and an open-web I-section beam, called a castellated beam?
What will be an ideal response?
A castellated beam is an I-section beam with some material (circular discs) removed from the center of the beam where the neutral axis lies. Because the stresses are zero at the neutral axis, the material there is not doing much structural work. Therefore, a castellated beam has less material than an I-beam but is structurally as strong as the I-beam, and hence it is structurally more efficient.
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