The ordinates of the moment influence line at midspan B of a 2-span continuous beam are pr...

The ordinates of the moment influence line at midspan B of a 2-span continuous beam are provided at every one-tenth of the span in Figure P12.56. (a) Position the AASHTO HL-93 design truck and lane loads in Figure 12.25f to produce the maximum moment. (b) Position the AASHTO HL-93 design tandem and lane loads shown in Figure 12.25(g) to produce the maximum positive moment. Which loading is more critical?

Figure P12.56:

Figure 12.25f: AASHTO HL-93 design live loads: (f) combination of design truck and lane load; (g) combination of design tandem and lane load.