2016/4/6 6.3 influence lines by equilibrium methods kN c 5m-45m-5m- 10m (a) R Rc 1kN P-10-1一 (c) D RA(kN) -10m 3 R R 2 (d) (b) Rc(kN) 5 6.3 example 2 ②③ (4 10' =的= 5 15 RA (a) (b) 2 15 5 Ve (kips) M (kip-ft) (c) (d) 32016/4/6 3 5 6.3 influence lines by equilibrium methods 6 6.3 example 2