Another of our concerns is exceeding the bending capacity of the beam. The critical location will be midspan, C. Because of the material choice and the way, the roof is constructed, the capacity of...

Another of our concerns is exceeding the bending capacity of the beam. The critical location will be midspan, C. Because of the material choice and the way, the roof is constructed, the capacity of the beam is the same for both positive and negative moments.

a. Guess whether the largest midspan moment generated by the roofing materials will be positive or negative.

b. Develop the influence line for the moment at midspan of the support beam, point C.

c. Determine the midspan moment generated by a distributed live load on both outer ends of 350 plf.

d. Determine the midspan moment generated by a distributed live load between the supports of 150 plf.

e. Which situation generates the largest midspan moment? We should encourage the maintenance contractor to place supplies at the location that generates the smallest moment.

F. Comment on why your guess in part (a) was or was not the same as what you discovered in part (e).