9-1力矩分配法的基本概念 4i1241 1 14 i1341 13 2i1241 3i1441 欢3 i1341 M2=4i2△， M21=2i2△1 M13=i3△， M31=-i13△1 M4=3i14△1 M41=0 9-1力矩分配法的基本概念 2i12Δ1 4i12Δ1 i13Δ1 i13Δ1 12 12 1 21 12 1 M i M i =  =  4 2 3i14Δ1 i12 i14 i13 2 1 3 M 4 M i M i 13 13 1 31 13 1 =  = −  14 14 1 41 M i M =  = 3 0