Not only does a pedestrian bridge need to carry gravity loads, but it also must sustain wind load acting on the side of the bridge. The idealized unfactored wind loads on the truss at the bottom of...

Not only does a pedestrian bridge need to carry gravity loads, but it also must sustain wind load acting on the side of the bridge. The idealized unfactored wind loads on the truss at the bottom of this bridge have been calculated by a team member. For preliminary design, the team needs to know the peak axial forces due to the wind. a. Guess which chord member will have the largest compression and which diagonal will have the largest compression. b. Use qualitative truss analysis to predict the sense of the axial force (tension, compression, zero, or can't be determined) in each member. c. List the assumptions you make in order to perform approximate analysis of the truss. d. Use approximate analysis to find the magnitude and sense of the peak axial force in the top chord, in the bottom chord, and in the diagonals. Hint: If you construct the V and M diagrams as if the truss is a solid beam, the diagrams will guide you to where the axial forces will be maximum. e. Use approximate analysis to find the magnitude and sense of the axial force in member JB. A J h L f. To demonstrate the effectiveness of approximate analysis, use structural analysis software to determine the peak axial force in the top chord, in the bottom chord, and in the diagonals. Also find the axial force in member JB. Assume all members are round HSS sections (E = 200 GPa = 200 kN/mm2). Assume the chords are HSS 152.4 x 6.4 (A = 2.72x103 mm2, I = 7.33 x 106 mm4) and all other members are HSS 48.3 x 3.7 (A = 4.83x102 mm2, I =1.22x105 mm4). g. Submit a printout of the displaced shape. Identify at least three features that suggest the deflected shape is reasonable. h. Verify equilibrium of the computer aided analysis results. i. Are the results of your computer aided analysis reasonable? Make a comprehensive argument to justify your answer. j. Comment on why your guess in part (a) was or was not close to the solution in part (d).