Question

Consider a cantilever beam of length L with a fixed vertical load, Po, applied at a random distance, z, fron the fixed end of the beam. Assumeェis uniformly distributed, fx (z) = CIH (z-L/2)-H(z-L)]. (a) What is C? (b) What is the expected value of the bending moment at the root of the cantilever? (c) Suggest two possible modes in which the structure could fail to perform properly under the specified load. (d) For one of the two failure modes you described in (c), derive a general formula that expresses the reliability of the structure. You dont need to evaluate it numerically, but the expression should be in a form that is ready to be evaluated if necessary. (e) Suppose the load now also has a random magnitude that is independent of the loads position. Assume that P follows a uniform distribution of width Po that is also symmetric about Po. What is the expected value of the bending moment at the root of the cantilever? How do you think the additional randomness affects the reliability of the structure? You do not have to derive the new reliability, but you must give adequate reasoning to justify your conclusion. It will help if you draw a qualitative picture of the relevant pdfs for comparison.

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