6. The load kg pipe is supported at D by a system of three cords. Determine the force in each cord. If the allowable tension of AC follows normal distribution N, which is independent from W, determine the probability of failure of cable AC.

60°

Solution

Thus, we could obtain

Thus, we have

and

Thus, the probability of failure of the system is that , where .

Also, we have

Finally, the probability of failure is

Ans.