基本氯习 拉(压)扭转 平面弯曲 omao max mNYo]rms可] 强度条件 N M max nImax omin W≥ [o] [a] Nm≤4a] Malm sWIth Mm Io U/mL「f 0m6 度条件变形能 0x <61 N(x U=rA dx MA(x M(x U L 2EA UFJ QGI JL 2EL拉 （压） 扭 转 平面弯曲 强度条件刚度条件变形能 [ ] s max  s [ ] max min s N A  [ ] Nmax  A s [ ] max t  t [ ] | | max tn t M W | [ ] max t M n  Wt [ ] s max  s [ ] max t  t [ ] max s M Wz  [ ] Mmax  Wz s [ ] q max  q q max  [q]   Lf L |f max | x EA N x U L d 2 ( ) 2  = x GI M x U L n d 2 ( ) 2  = x EI M x U L d 2 ( ) 2  =