HC represents the section size of beam and column in the building. Section size: generally, objects are three-dimensional, cut along a certain direction of an object, and the overall dimension of the cut section is called section size. Cross section and profile dimensions are often used. For example, the cross section size of the reinforcement is 8 mm round, 15 mm round, etc. Another example is that the cross section of the channel is isosceles trapezoid, with a bottom of 1m, a depth of 0.8m, and a slope coefficient of 0.5
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