Handbook of Civil Engineering Calculations

Moving Loads and Influence Lines

ANALYSIS OF BEAM CARRYING MOVING

CONCENTRATED LOADS

The loads shown in Fig. 41 a traverse a beam of 40-ft (12.2-m) simple span while their
spacing remains constant. Determine the maximum bending moment and maximum shear
induced in the beam during transit of these loads. Disregard the weight of the beam.

(a) Load system

(b) Position I, for 10-kip (44.5-kN) load

(d) Position 3, for 15-kip (66.7-kN) load

FIGURE 47

(c) Position 2, for 4-kip (17.8-kN) load