MT-1620 Fall 2002 What about for x, s X Does one need to go through this whole procedure again? No! Can use the same formulation due to the symmetry of c Thus far have looked at the influence of a force on a displacement May want to look at the opposite: the influence of a displacement on a force. do this via Stiffness Influence Coefficients where can write kugu +k, g2+k Q2=k21q1+k242+k3q3 g3=k31q1+k292+k3q3 Paul A Lagace @2001 Unit 21-11MIT - 16.20 Fall, 2002 --> What about for xi ≤ xj? Does one need to go through this whole procedure again? No! Can use the same formulation due to the symmetry of Cij (Cij = Cji) --> Thus far have looked at the influence of a force on a displacement. May want to look at the “opposite”: the influence of a displacement on a force. Do this via… Stiffness Influence Coefficients ≡ kij where can write: Q1 = k11 q1 + k12 q2 + k13 q3 Q 2 = k21 q1 + k22 q2 + k23 q3 Q 3 = k31 q1 + k32 q2 + k33 q3 Paul A. Lagace © 2001 Unit 21 - 11