An S6 × 12.5 steel cantilever beam AB is supported by a steel tic rod at B as shown. The tie rod is just taut when a roller support is added at Cat a distance s to the left of £, then the distributed load q is applied to beam segment AC, Assume E = 30 × 106 psi and neglect the self-weight of the beam and tie rod. Sec Table F-2(a) in Appendix F for the properties of the S-shape beam.
(a)
What value of uniform load q will, if exceeded, result in buckling of the tie rod if L1, =6 ft, s = 2 ft, H = 3 ft, and d = 0.25 in.?
(b)
What minimum beam moment of inertia ibis required to prevent buckling of the tie rod if q = 200 lb/ft, L1, = 6 ft, H = 3 ft, d = 0.25 in., and s = 2 ft?
(c)
For what distance s will the tic rod be just on the verge of buckling if q = 200 lb/ft, L1= 6 ft, M = 3 ft, and d = 0.25 in.?
(a)
The value of uniform load
Answer to Problem 11.3.25P
The value of uniform load
Explanation of Solution
Given information:
The young’s modulus of beam and tie rod is
Write the expression for the deflection in beam at point
Here, the uniformly distributed load on beam is
Write the expression for the force generated in the tie rod.
Here, the length of the tie rod is
Write the expression for the deflection in beam at point
Write the expression for the compression of length of the tie rod.
Here, the cross section area of tie rod is
Write the expression for compatibility equation.
Substitute
Write the expression for the moment of inertia of tie rod.
Write the expression for the area of tie rod.
Calculation:
Substitute
Substitute
Substitute
Refer to table
Substitute
Substitute
Substitute
Conclusion:
The value of uniform load
(b)
The minimum moment of inertia of beam to prevent buckling in tie rod.
Answer to Problem 11.3.25P
The minimum moment of inertia of beam to prevent buckling in tie rod is
Explanation of Solution
Given information:
Intensity of uniformly distributed load on beam is
Calculation:
Substitute
Conclusion:
The minimum moment of inertia of beam to prevent buckling in tie rod is
(c)
The distance between point
Answer to Problem 11.3.25P
The distance between point
Explanation of Solution
Given information:
Intensity of uniformly distributed load on beam is
Calculation:
Substitute
Conclusion:
The distance between point
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