MT-1620 al.2002 So El evaluate at x W 2EⅠ3 x One important note w is defined as positive up, have defined q; as positive down So q =-W XX 2EⅠ X: x forx≤ EⅠ2 Deflection, q at x due to unit force, Q atxi Paul A Lagace @2001 Unit 21-10MIT - 16.20 Fall, 2002 So: 3 1  x2 x  w = − EI  xj 2 − 6  evaluate at xi: 1  xi 3 2  w = − x xj  2 EI    3 i One important note: w is defined as positive up, have defined qi as positive down. So: 3 2 qi = − w = 1  x xj − xi  2 EI  i 3  ⇒ C EI xx x ij i i = −     1 2 2 3 j 6 for xi ≤ xj Deflection, qi, at xi due to unit force, Qj, at xj Paul A. Lagace © 2001 Unit 21 - 10