Rothoblaas - 木螺钉和连接器 Page 321
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计算示例 每平方米（m2）的支架数量应根据作用的荷载和板条之间的轴距进行评估。 表面支架的发生率 (I)： q = 作用荷载 [kN/m2] I = q/Fadm = JFA 件数/ m2 Fadm = JFA 允许载重 [kN] 支架之间的最大距离 (a): a amax, JFA a= min 其中： amax, JFA = 1/件数/m2/i i amax, listello amax, listello = 3 i = 板条轴距 flim = 支撑之间的瞬时挠度限制 E = 材料弹性模量 E · J ·384 J = 板条截面惯性力矩 flim · 5 · q · i 实际示例 项目数据 露台面积 A=6m S = A x B = 6 m x 4 m = 24 m2 板条 50 mm b = 50 mm h = 30 mm B=4m 30 mm 荷载 过载 预期用途类别：A 类（阳台） (EN 1991-1-1) JFA支架 允许载重 0,50 m 板条材料 支撑之间的瞬时挠度限制 flim 板条截面惯性力矩 J 材料弹性力矩 a = min 3 C20 (EN 338:2016) - 9,5 kN/mm2 112500 mm4 - 支架强度限制 amax, listello = 3 0,40 m amax, JFA = 1/n/i E · J ·384 amax, JFA = 1/5,00/0,5 = 0,40 m 400 · 5 · q·i 400 · 5 · (4,0 · 10-6) · 500 = min amax, listello 0,80 kN 废料系数 = 1,05 9,5 · 112500 · 384 amax, JFA Fadm n = 5,00 件/m2 · 24 m2 · 1,05 = 126 个 JFA 支架之间最大距离的计算 amax, listello = (5/384) · (q · i · a4)/(E · J) 4,00 kN/ m2 n = I · S · 废料系数 = JFA件数 I = q/Fadm = JFA 件数/ m2 I = 4,0 kN/m2/0,8 kN = 5,00 件/m2 因此： h3)/12 q JFA 支架数 发生率 = (b · fmax JFA 数量的计算 板条弯曲极限 a/400 E0,mean 板条最大挠度 flim fmax i= 0,50 m · 10 -3 = 0,47 m = 0,40 m JFA支架之间的最大距离 0,47 m 户外 | JFA | 321
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