MidtermW08WSolution - CEE 379 Midterm Exam Winter 2008...

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Unformatted text preview: CEE 379 Midterm Exam Winter 2008 Name: Closed Book; 1 pages of notes. Part I: Short Answer (3 points each) 1. The key principle underlying the stiffness method of analysis we have been using throughout the quarter is to express equilibrium in terms of what? (joint) displacements. 2. The truss element shown below is subjected to a unit x-displacement. The characteristic stiffness for the element is given as indicated. What is the vertical force component required at the displaced joint to sustain this displacement? (Assume consistent units). x y 1 [ k T ] = bracketleftbigg 640 480 480 360 bracketrightbigg { P j } = [ k T ] braceleftbigg 1 bracerightbigg = braceleftbigg 640 480 bracerightbigg P y = 480 3. A 1-D spring element connects joints 3 and 5 in a system whose initial stiffness matrix is all zeros as shown below. Circle the entries in the system stiffness matrix that will be affected when this element is assembled into the system. [ K ] = x x x x 4. Select the correct moment diagram for the loaded frame shown from the choices below: None of these 1 CEE 379 2 5. Answer the following questions for the spring structure shown below....
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MidtermW08WSolution - CEE 379 Midterm Exam Winter 2008...

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