For the truss of Problem 8.49, determine the maximum compressive axial force in member G...

For the truss of Problem 8.49, determine the maximum compressive axial force in member GH due to the series of four moving concentrated loads shown in Fig. P9.14.

Reference: Problem 8.49

Draw the influence lines for the forces in the members identified by an ‘‘×’’ of the trusses shown in Figs. P8.45–P8.52. Live loads are transmitted to the bottom chords of the trusses.