What type of load is typically considered in the evaluation of a bridge?

In the evaluation of a bridge, considering both static and dynamic loads is essential for ensuring structural integrity and safety. Static loads refer to the weight of the bridge itself, vehicles, pedestrians, and any other permanent or semi-permanent loads that the bridge must support. These loads typically remain constant over time. Dynamic loads, on the other hand, represent forces that change over time, such as moving vehicles, wind forces, seismic activity, and potential impacts.

By evaluating both types of loads, engineers can better understand how the bridge will perform under various conditions. This comprehensive approach allows for a more accurate assessment of the bridge's ability to withstand everyday use as well as extreme events.

Focusing solely on static loads would neglect critical aspects of how a bridge behaves under real-world conditions where movement and forces are constantly changing. On the other hand, excluding static loads would lead to an incomplete understanding of the bridge's overall structural requirements. Environmental loads, while important, are just one subset of the broader category of loads considered in bridge evaluations. Therefore, the integration of both static and dynamic loads ensures a robust analysis and helps in making informed decisions regarding the maintenance, repair, or replacement of a bridge.