=0.505kNР(7)杆件剪应力:Р τ: 杆件剪应力:Р Ss: 杆件型材截面面积矩: 8.847cm3Р Ix: 杆件型材截面惯性矩: 15.813cm4Р t: 杆件壁厚: 1.4mmР τ=Q×Ss×100/Ix/tР =0.505×8.847×100/15.813/1.4Р =20.197N/mm2Р 20.197N/mm2 < 49.6N/mm2Р 杆件抗剪强度可以满足!Р(8)型材刚度的计算::Р 校核依据: Umax≤15mm 且 Umax/L≤1/180РU:杆件最大挠度(mm)РU1:受力构件在扇框位置受荷单元作用下的最大挠度(mm)РU2:受力构件在上亮位置受荷单元作用下的最大挠度(mm)Рqsk1=Wk×Wsk1/2Р =1.205×0.800/2Р =0.482Р U1=qsk1×Wsk14×108/(120×E×Ix)Р =0.482×0.8004×108/(120×70000×15.813)Р =0.149 (mm)Рqsl1=Wk×Hsl/2Р =1.205×0.800/2Р =0.482Р Ba=Hsl/2Р =0.800/2Р =0.400Р C=(25/8)-5×(Ba2/Wsl12)+2×(Ba4/Wsl1)Р =2.780Р U2=qsl1×Wsl14×108×C/(240×E×Ix)Р =0.482×1.5004×108/(240×70000×15.813)Р =2.553 (mm)Р U=U1+U2Р =0.149+2.553Р =2.702mmР Du: 杆件最大挠度与其长度比值:Р Wsk1: 杆件长度: 0.800mР Du=U/(Wsk1×1000)Р =2.702/(0.800×1000)Р =1/296Р U=2.702mm < 15mmР Du < 1/180 ,采用5+9a+5中空玻璃。Р 挠度可以满足要求!
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