8l = 209.3cm, l0y = l =261.6 cmР计算需要净截面面积Р选用2∟40×5,见图4所示,A = 7.58c㎡, ix = 1.21cm , iy = 1.90cmРxРxРyРyР6Р图 4斜杆11-2截面Р验算:Р Р所选截面满足要求。Р 斜杆2-13РN =-95.1kN (压力),l0x =2302mm l0y = l =2878mmР计算需要净截面面积Р选用2∟56×8,见图5所示,A =1674mm2 , ix =1.68cm , iy =2.60cmРxРxРyРyР6Р图5斜杆2-13截面Р 属于b类截面Р 属于b类截面Р满足长细比:的要求。Р由于只需求出,查轴心受压构件的稳定系数表,Р所选截面合适。Р斜杆13-3Р.N =64.39kN(拉力),l0x = 0.8l = 229.4cm, l0y = l =286.7 cmР计算需要净截面面积Р选用2∟25×4,见图6所示,A =3.72 c㎡, ix =0.74 cm , iy =1.30 cmРxРxРyРyР6Р图 6 斜杆13-3截面Р验算:Р Р所选截面满足要求。Р 斜杆3-15РN =-43.76kN (压力),l0x =251.0cm l0y = l =313.8cmР选用2∟63×4,见图7所示,A =9.96c㎡, ix = 1.96cm , iy = 2.80cmРxРxРyРyР6Р图7 斜杆3-15截面Р 属于b类截面Р 属于b类截面Р满足长细比:的要求。Р由于只需求出,查轴心受压构件的稳定系数表,Р所选截面合适。Р 斜杆15-4РN = 24.03kN(拉力),l0x = 0.8l = 2502mm, l0y = l =3127cmР计算需要净截面面积Р选用2∟30×3,见图8所示,A = 3.50c㎡, ix =0.91 cm , iy = 1.47 cm
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