What are the other two redundancies in the load path besides the main redundancies?

What are the other two redundancies in the load path besides the main redundancies?

• A. External and Global
• B. Internal and System
• C. Primary and Secondary
• D. Local and Global

Answer: (B)

Redundancy in the load path means there are extra ways for loads to be carried if part of the structure starts to fail, so the bridge won’t suddenly lose capacity. Beyond the main redundancies along the primary path, two other kinds exist: internal redundancy and system redundancy. Internal redundancy refers to multiple load-carrying routes within a single component or connection. If part of that member or weld or joint is compromised, the remaining portions share the load and keep the path intact rather than letting the load drop to zero. System redundancy involves alternative load paths at the broader structural level. This means the overall arrangement—such as multiple girders, diaphragms, and cross-bracing—can redistribute forces if one element becomes weak or fails, preventing a localized issue from causing a global failure. Other terms in the options don’t align with how redundancies in the load path are described in this context.

Redundancy in the load path means there are extra ways for loads to be carried if part of the structure starts to fail, so the bridge won’t suddenly lose capacity. Beyond the main redundancies along the primary path, two other kinds exist: internal redundancy and system redundancy.

Internal redundancy refers to multiple load-carrying routes within a single component or connection. If part of that member or weld or joint is compromised, the remaining portions share the load and keep the path intact rather than letting the load drop to zero.

System redundancy involves alternative load paths at the broader structural level. This means the overall arrangement—such as multiple girders, diaphragms, and cross-bracing—can redistribute forces if one element becomes weak or fails, preventing a localized issue from causing a global failure.

Other terms in the options don’t align with how redundancies in the load path are described in this context.