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用薄钢板(厚度≤3毫米)制成的冷成型檩条,开始在西德应用,在英国已用得很广泛。这种∑形截面有如下特点:1.壁厚小,所得单位重量的截面抵抗矩大。2.腹板向里缩进,截面的剪切中心不象
Cold-formed purlins made of sheet steel (thickness ≤ 3 mm) have been used in West Germany and have been used extensively in the United Kingdom. This ∑-shaped section has the following characteristics: 1. The wall thickness is small, and the cross-section resistance of the unit weight obtained is large. 2. The web is retracted inwards, and the shear center of the cross section does not look like