2016/4/6 Example 2 HS 20-44 truck 60 72 33.2 a-141 28 ·2 27.67 388 @“二回 6.4 influence line by virtual work: Mueller-Breslau principle 城 a (△)2 (R41)+(1(-△)=0 (P)1 (c) 上工程学院 分 92016/4/6 9 17 Example 2 18 6.4 influence line by virtual work: Mueller-Breslau principle