Computer application. Construction of an influence line for an indeterminate beam. (a) For...

Computer application. Construction of an influence line for an indeterminate beam. (a) For the indeterminate beam shown in Figure P12.48, construct the influence lines for M_A, R_A, and R_B by applying a unit load to the beam at 4-ft intervals to compute the corresponding magnitudes of the reactions.

(b) Using the influence line in part (a), determine the maximum value of the reaction R_B produced by two concentrated 20-kip wheel loads spaced 8 ft apart.

Figure P12.48: