PA1_09_equilibrium_stress_strain

PA1_09_equilibrium_stress_strain - maximum due to this load...

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ENGRI/CEE 1160: Modern Structures Fall 2009 PROFESSIONAL ASSIGNMENT 1 NOTES: 1. Date Due: Midnight, Thursday, Sept.17 th 2. Please submit to the Digital Dropbox on the course Blackboard site. 3. State ALL assumptions. In the real world, problems are hardly ever closed- ended: they are usually ambiguous, and need you to complete their definition. Equilibrium Analysis, Stress, and Strain Problem 1 . Figure 1 shows a view of the pedestrian bridge over Cascadilla Gorge. Figure 2 is a sketch of one of the bridge’s main steel girders. Visit the bridge, and (carefully) observe the supports at points A and B. Then assume that one of the design conditions for this bridge is two 10,000 lb emergency vehicles parked at any location along the bridge. a. Find the reactions at points A and B when the vertical reaction at point A is at its
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Unformatted text preview: maximum due to this load condition. b. Find the magnitude and location of the maximum bending moment in the girder under this condition. c. Does the variation is depth of this girder make technical sense? Why do you think it has this shape? Figure 1. View of new (2006) pedestrian bridge over Cascadilla Gorge. 1 Figure 2. Sketch of one of the steel girders supporting the bridge. Problem 2. Hows your trig? For the ideal truss structure shown in Figure 3: a. Find the reactions; b. Find the forces in the members of the truss; c. If the truss is composed of steel members, each of which has a cross-sectional area of 1 in 2 , make a table showing the stress and strain in each member. Figure 3. A simple truss structure. 2 20 ft 20 ft 20 k 25 degrees 120-0 25-0 A B...
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This note was uploaded on 10/25/2009 for the course CEE 1160 at Cornell University (Engineering School).

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PA1_09_equilibrium_stress_strain - maximum due to this load...

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