3rd Croatian Conference on Earthquake Engineering 3CroCEE

This paper presents the procedure for remote testing of various categories of bridges, incorporating both static and dynamic assessment methodologies. The investigated structures include different types of bridges categorized by the structural system and materials, as well as different categories of bridges according to their usage. Therefore, the study incorporates a cable-stayed steel pedestrian bridge, a simply supported steel girder railway bridge and a prestressed reinforced concrete road bridge. The objective of the testing was to evaluate the structural performance, safety, and long-term serviceability of these diverse bridge types under varying load conditions. For the testing phase, an advanced radar technique called microwave interferometry is employed. Using a high-precision interferometric radar system to remotely monitor deflection patterns, any subtle displacements with millimetre-level accuracy were detected. Additionally, accelerometer devices were employed to record the resulting accelerations and vibration patterns, enabling a detailed analysis of the structural behaviour under dynamic loads and confirming the accuracy of the interferometric remote testing procedure. The combination of static and dynamic testing allowed for a thorough evaluation of the bridges' stiffness, damping characteristics, and overall structural integrity. The findings highlight key insights into the current condition and performance of the various types of bridges. Overall, the study emphasizes the necessity of integrating static and dynamic testing methodologies for accurate structural assessment, especially in complex traffic networks. The findings provide a strong basis for informed decision-making regarding maintenance strategies, ensuring the continued safety and serviceability of these critical infrastructures. Regular monitoring and timely intervention based on these insights are essential to extending the lifespan and reliability of the bridges.