For the truss of Problem 8.51, determine the maximum tensile and compressive axial force...

For the truss of Problem 8.51, determine the maximum tensile and compressive axial forces in member DI due to a concentrated live load of 40 k, a uniformly distributed live load of 4 k/ft, and a uniformly distributed dead load of 2 k/ft.

Reference: Problem 8.51

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.