What is the primary objective of performing permit load rating?

The primary objective of performing permit load rating is to determine whether a bridge can safely carry a specific overweight or oversized vehicle that exceeds the legal load limits. This involves a detailed structural analysis to assess the stresses and deflections induced by the permit vehicle, considering its weight, axle configuration, and dimensions. The permit load rating ensures that the bridge can safely accommodate the permit vehicle without exceeding allowable stress limits or compromising its structural integrity. If the analysis indicates that the bridge can safely carry the vehicle, a permit may be issued, often with restrictions on speed, lane position, or other factors to minimize the impact on the bridge. The permit load rating process is crucial for allowing the transportation of heavy or oversized loads while protecting the safety and longevity of the bridge infrastructure.