Structural Analysis Review

Fall 2015

First, let’s review what’s in the FE Reference Handbook

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Example Problems

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Problem 1: The 40 kip vertical load at Joint C in the steel truss shown below produces the forces given in the accompanying table. The cross-sectional area of each member is 4.0 in2, and the length of member is given in the table. The elastic modulus of steel is 29,000 ksi. The downward vertical displacement of Joint C is most nearly:

A. 1.046 in B. 0.294 in C. 0.132 in D. 0.102 in

Problem 1: The 40 kip vertical load at Joint C in the steel truss shown below produces the forces given in the accompanying table. The cross-sectional area of each member is 4.0 in2, and the length of member is given in the table. The elastic modulus of steel is 29,000 ksi. The downward vertical displacement of Joint C is most nearly:

Apply a downward 1 kip load (unit load) at Joint C and compute the forces f in bars.

This can easily be done by dividing each F force by 40.

The following table can be computed:

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Problem 1: The 40 kip vertical load at Joint C in the steel truss shown below produces the forces given in the accompanying table. The cross-sectional area of each member is 4.0 in2, and the length of member is given in the table. The elastic modulus of steel is 29,000 ksi. The downward vertical displacement of Joint C is most nearly:

A. 1.046 in B. 0.294 in C. 0.132 in D. 0.102 in

Problem 2: The frame in the figure is:

A. unstableB. stable and determineC. indeterminate one degreeD. indeterminate two degrees

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Problem 2

Unknown reactions and internal forces at internal pins: 6 X 2 = 12

Rigid body components (shown as FBDs) @ 3 equations per component: 4

Number of equations: 4 x 3 = 12

There are 12 equations and 12 unknowns

A. unstableB. stable and determineC. indeterminate one degreeD. indeterminate two degrees

Problem 3: Which of the vertical-load influence lines shown below is correct for Member U2U3 of the truss shown below?

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Problem 3: Which of the vertical-load influence lines shown below is correct for Member U2U3 of the truss shown below?

The upper chord is always in compression

Therefore, it is either A or B

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Structural Analysis Review

Questions?

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