All structures during their operational period are inevitably affected by certain destructive natural and unnatural factors. Since many significant structures built several decades ago are still in use, continuous monitoring of the performance of important structures to ensure their proper functioning, timely identification of damage, analysis of damaged structures, and, if necessary, rehabilitation, strengthening, or repair of damaged and vulnerable elements to enhance the useful life of the structure is of high importance. Structural health monitoring broadly refers to a procedure for obtaining accurate information about the condition and performance of a structure, which can be evaluated over short or long-term periods. These methods are classified into dynamic and static identification methods based on the data used. The objective of these methods is to compare the parameters of the analytical or numerical model with the measured field data and assess their conformity with each other. In this research, the details of monitoring the performance and behavior of precast concrete beams as a three-span bridge structure at kilometer 90 of the Arak-Kermanshah railway are described using a loading test method. The results indicate satisfactory performance of the structure under study, causing normal stress equal to 11 and 9 percent of the ultimate strength of concrete in the main beams and a maximum measured deflection of 4.4 millimeters, equivalent to 17.5 percent of the allowable deflection in static and dynamic loading tests. Moreover, the stresses and displacements monitored in the structural elements under static loading show good agreement with the results obtained from numerical modeling.