The Sima Port Bridge is located on the Dachang Line in Rugao City. It is a three-span simply supported slab bridge facing north-south. The total length of the bridge is 75m, the width of the bridge is 24.6m, and the span arrangement is 3 * 25m. This bridge belongs to an agricultural road bridge. There are many heavy-duty vehicles in daily use, and there are ships passing under the bridge. To ensure the safe operation of the bridge, bridge vibration monitoring is used to identify heavy-duty traffic and ship collisions.