What is the purpose of dynamic load testing and how does it differ from static load testing?

The purpose of dynamic load testing is to assess the dynamic response of a bridge under moving loads, while static load testing assesses the bridge's behavior under stationary loads. Dynamic load testing involves measuring the bridge's vibrations, impact factors, and dynamic deflections caused by moving vehicles or other dynamic forces. This type of testing can reveal information about the bridge's damping characteristics, natural frequencies, and overall dynamic performance. Static load testing, on the other hand, involves applying known static loads to the bridge and measuring the resulting deflections, strains, and support reactions. Static testing primarily assesses the bridge's stiffness, load-carrying capacity, and stress distribution under static conditions. Dynamic load testing captures the bridge's response to dynamic effects, while static load testing assesses its behavior under sustained, stationary loads.