Question of the Week
The typical section of a 3-span steel plate girder bridge is shown in the figure. The spans are 90 ft., 120 ft., 90ft. The web depth is 39 inches, thickest bottom flange is 2 inches; bridge deck haunch is 1 ft and the barrier is 2 ft.-8 inches in height. The K-Type intermediate cross frames shown are spaced at 20 ft. and are composed of single angles 4 x 4 x 0.5 inches and the diagonals make a 38 degrees with the bottom struts. Consider a constant wind pressure of 50 PSF and the diagonal take both tension and compression.
Design Code: AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS
Find the design force at the bottom strut in kips
The correct answer is B (2.50)
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