Question

Problem 5: The truss below is a bridge that supports traffic loading along its top chord. Given the traffic loading below (representing a car pullinga trailer) and the influence line for the force in member DJ, find: a) The maximum compressive force that can be developed in member DJ. b) The maximum tensile force that can be developed in member DJ. The car and trailer can move in either direction across the bridge. 3k 4k 2k м 12 ft 6 ft 8 ft C D E F B G 6@ 15 ft-90 ft 0.8 0.4 LL. (FD) (k/k) x () 0.0 -0.4 -0.8

Answer 1

FDJ a to 0.8 u 0.64 0.4 0.64 / I 1.16 I 3K, 4K 2K1 T 24 -0.4 0.4 IS! 3* SK 12K b). max. Tensile force. FDJ = 460.8) + 64 (3) of 0.16 (2) For = suuk compressive force For a 3(-0.4+4 (0:24) TFT = -2.21k.] a). man. +2(-0.026)