>y67图杀条A处为定铰链支座BC二处为舰轴支座,渠作用有均布荷载已 知:均布荷载集度q=15Nm,L=4m,梁圆截面直径d=100mm]100MPa 试校核该梁的强度 列静力平衡方程 ∑ F.=0 F+F+f-aL B ,=0 B L2 韦2 ∑M=0 L Fca+FBL+ 2 变形协调方程 5gL Fl 2(q)+2(F2)=0384E-48E =OFR o9L F= 3 16 11-16 q knm knm 32M max =76.4MPa 4.22kNm三 4.22kNm图示梁,A处为固定铰链支座,B,C二处为辊轴支座.梁作用有均布荷载.已 知:均布荷载集度q=15N/m,L=4m,梁圆截面直径d=100mm,[σ]=100MPa. 试校核该梁的强度. 例题 6.7 L 2 A B L 2 q C FC FA FB 列静力平衡方程 F + F + F − qL = 0 A B C Fy = 0 MA = 0 0 2 2 2 + + − = qL F L L FC B 变形协调方程 ( )+ ( ) = 0 C C FC  q  EIZ qL 384 5 4 Z C EI F L 48 3 − = 0 FC qL 8 5 = FB qL 16 3 = FA qL 16 3 = 4.22kNm7.5kNm 4.22kNm M 7.5kNm max = WZ M max  = 3 max 32 d M  = = 76.4MPa  