What characterizes load path redundancy in a bridge?

Load path redundancy in a bridge is characterized by the ability of the structure to redistribute loads among the remaining load-bearing members when one member fails. This redundancy ensures that even if there is a failure in one part of the structure, the load can still be supported by alternative paths, preventing catastrophic failure of the entire system. This concept is crucial for the safety and reliability of bridge designs, as it enhances the structural integrity and resilience against unforeseen events.

In contrast, the other statements do not accurately reflect the principle of load path redundancy. For instance, saying that all members are equally strong does not pertain to load path redundancy, as members can vary in strength and still provide redundancy if the load can be redirected. The notion of not distributing load when one member fails contradicts the essence of redundancy, which is precisely about managing and distributing load effectively in the event of such a failure. Lastly, stating that redundancy is irrelevant in fracture critical evaluations overlooks the importance of assessing how load can be managed and redistributed under various failure scenarios, which is a key aspect of these evaluations.