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工字钢顶部是平面，铝型材的为什么要做成带凹槽状的？那么请问它的截面特性能否还能按照平面计算？不能的话怎么算？还有他的平面上为什么也要做成凹坑，增加摩擦力的吗？？
全部回答（1 ）
也是增加摩擦，主要是增加受力面积，更牢固dribbble.com/bjzjz/collections/4545880,dribbble.com/bjzjz/collections/4545884,dribbble.com/bjzjz/collections/4545885,dribbble.com/bjzjz/collections/4545890,dribbble.com/bjzjz/collections/4545893,dribbble.com/bjzjz/collections/4545896,dribbble.com/bjzjz/collections/4545897,dribbble.com/bjzjz/collections/4545899,dribbble.com/bjzjz/collections/4545901,dribbble.com/bjzjz/collections/4545905,dribbble.com/bjzjz/collections/4545909,dribbble.com/bjzjz/collections/4545911,dribbble.com/bjzjz/collections/4545913,dribbble.com/bjzjz/collections/4545915,dribbble.com/bjzjz/collections/4545917,dribbble.com/bjzjz/collections/4545919,dribbble.com/bjzjz/collections/4545921,dribbble.com/bjzjz/collections/4545923,,dribbble.com/shzjz/collections/4545936,dribbble.com/shzjz/collections/4545940,dribbble.com/shzjz/collections/4545944,dribbble.com/shzjz/collections/4545947,dribbble.com/shzjz/collections/4545950,dribbble.com/shzjz/collections/4545953,dribbble.com/shzjz/collections/4545957,dribbble.com/shzjz/collections/4545959,dribbble.com/shzjz/collections/4545962,dribbble.com/shzjz/collections/4545966,dribbble.com/shzjz/collections/4545970,dribbble.com/shzjz/collections/4545972,dribbble.com/shzjz/collections/4545975,dribbble.com/shzjz/collections/4545978,dribbble.com/shzjz/collections/4545979,dribbble.com/shzjz/collections/4545980,dribbble.com/shzjz/collections/4545982,dribbble.com/shzjz/collections/4545983,,dribbble.com/gzzjz/collections/4545992,dribbble.com/gzzjz/collections/4545994,dribbble.com/gzzjz/collections/4545997,dribbble.com/gzzjz/collections/4546000,dribbble.com/gzzjz/collections/4546002,dribbble.com/gzzjz/collections/4546005,dribbble.com/gzzjz/collections/4546006,dribbble.com/gzzjz/collections/4546009,dribbble.com/gzzjz/collections/4546012,dribbble.com/gzzjz/collections/4546014,dribbble.com/gzzjz/collections/4546018,dribbble.com/gzzjz/collections/4546020,dribbble.com/gzzjz/collections/4546022,dribbble.com/gzzjz/collections/4546025,dribbble.com/gzzjz/collections/4546027,dribbble.com/gzzjz/collections/4546030,dribbble.com/gzzjz/collections/4546032,dribbble.com/gzzjz/collections/4546035,,dribbble.com/szzjz/collections/4546044,dribbble.com/szzjz/collections/4546046,dribbble.com/szzjz/collections/4546049,dribbble.com/szzjz/collections/4546052,dribbble.com/szzjz/collections/4546054,dribbble.com/szzjz/collections/4546055,dribbble.com/szzjz/collections/4546057,dribbble.com/szzjz/collections/4546058,dribbble.com/szzjz/collections/4546059,dribbble.com/szzjz/collections/4546060,dribbble.com/szzjz/collections/4546062,dribbble.com/szzjz/collections/4546065,dribbble.com/szzjz/collections/4546069,dribbble.com/szzjz/collections/4546071,dribbble.com/szzjz/collections/4546073,dribbble.com/szzjz/collections/4546075,dribbble.com/szzjz/collections/4546077,dribbble.com/szzjz/collections/4546078,
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全部回答（1 ）
也是增加摩擦，主要是增加受力面积，更牢固dribbble.com/bjzjz/collections/4545880,dribbble.com/bjzjz/collections/4545884,dribbble.com/bjzjz/collections/4545885,dribbble.com/bjzjz/collections/4545890,dribbble.com/bjzjz/collections/4545893,dribbble.com/bjzjz/collections/4545896,dribbble.com/bjzjz/collections/4545897,dribbble.com/bjzjz/collections/4545899,dribbble.com/bjzjz/collections/4545901,dribbble.com/bjzjz/collections/4545905,dribbble.com/bjzjz/collections/4545909,dribbble.com/bjzjz/collections/4545911,dribbble.com/bjzjz/collections/4545913,dribbble.com/bjzjz/collections/4545915,dribbble.com/bjzjz/collections/4545917,dribbble.com/bjzjz/collections/4545919,dribbble.com/bjzjz/collections/4545921,dribbble.com/bjzjz/collections/4545923,,dribbble.com/shzjz/collections/4545936,dribbble.com/shzjz/collections/4545940,dribbble.com/shzjz/collections/4545944,dribbble.com/shzjz/collections/4545947,dribbble.com/shzjz/collections/4545950,dribbble.com/shzjz/collections/4545953,dribbble.com/shzjz/collections/4545957,dribbble.com/shzjz/collections/4545959,dribbble.com/shzjz/collections/4545962,dribbble.com/shzjz/collections/4545966,dribbble.com/shzjz/collections/4545970,dribbble.com/shzjz/collections/4545972,dribbble.com/shzjz/collections/4545975,dribbble.com/shzjz/collections/4545978,dribbble.com/shzjz/collections/4545979,dribbble.com/shzjz/collections/4545980,dribbble.com/shzjz/collections/4545982,dribbble.com/shzjz/collections/4545983,,dribbble.com/gzzjz/collections/4545992,dribbble.com/gzzjz/collections/4545994,dribbble.com/gzzjz/collections/4545997,dribbble.com/gzzjz/collections/4546000,dribbble.com/gzzjz/collections/4546002,dribbble.com/gzzjz/collections/4546005,dribbble.com/gzzjz/collections/4546006,dribbble.com/gzzjz/collections/4546009,dribbble.com/gzzjz/collections/4546012,dribbble.com/gzzjz/collections/4546014,dribbble.com/gzzjz/collections/4546018,dribbble.com/gzzjz/collections/4546020,dribbble.com/gzzjz/collections/4546022,dribbble.com/gzzjz/collections/4546025,dribbble.com/gzzjz/collections/4546027,dribbble.com/gzzjz/collections/4546030,dribbble.com/gzzjz/collections/4546032,dribbble.com/gzzjz/collections/4546035,,dribbble.com/szzjz/collections/4546044,dribbble.com/szzjz/collections/4546046,dribbble.com/szzjz/collections/4546049,dribbble.com/szzjz/collections/4546052,dribbble.com/szzjz/collections/4546054,dribbble.com/szzjz/collections/4546055,dribbble.com/szzjz/collections/4546057,dribbble.com/szzjz/collections/4546058,dribbble.com/szzjz/collections/4546059,dribbble.com/szzjz/collections/4546060,dribbble.com/szzjz/collections/4546062,dribbble.com/szzjz/collections/4546065,dribbble.com/szzjz/collections/4546069,dribbble.com/szzjz/collections/4546071,dribbble.com/szzjz/collections/4546073,dribbble.com/szzjz/collections/4546075,dribbble.com/szzjz/collections/4546077,dribbble.com/szzjz/collections/4546078,