The channel is U-shaped cross-section, while the crossbeam is can be divided into H-plate, I-beam, etc. Both of them have different uses.
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A channel is a U shaped (cross-section) steel/alloy bar, while a beam can be an I-shaped, H-shaped, T-shaped steel/alloy bar.
plinth beam is a part of a structure can transfer loads to the adjacent columns,grade beam is a type of foundation system used to distribute the weight of a building over unstable soil. The grade beam may sit directly on the loose soil.
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