# Using AI-Based Tools to Quantify the Technical Condition of Bridge Structural Components
## 1 Introduction
Static and dynamic tests of bridge structures can occur simultaneously, which provides a more comprehensive understanding of the bridge's overall spatial performance, integrating static and dynamic responses into a unified framework. For example, it can control static loads (heavy vehicles) while simultaneously monitoring the structure's dynamic response using sensors like accelerometers and strain gauges. Various systems for monitoring construction structures' static and dynamic characteristics have been used for quite a long time in road construction. However, using modern measuring systems and computer technologies makes it possible to solve much more complex problems of trouble-free operation of complex transport facilities at the level of monitoring their full life cycle. Bridge monitoring can be conditionally divided into two processes: technical inspection and quantitative assessment of technical condition. Technical inspection consists of conducting a visual assessment of the condition of the facility or its parts while recording the identified structural and standard deviations. The initial data of the technical inspection are qualitative and quantitative indicators of the operational properties of a structure. The other part of the data is represented by mechanical characteristics of materials and structural components that derive from blueprints and destructive tests. All this information allows for assessing the structure's technical condition, determining the structure's residual resources, and planning the operation of the bridge. Timely detection of defects and types of damage during monitoring saves time and reduces future bridge maintenance costs. Then, global experience in the field of inspection and assessment of the technical condition of bridge structures was analyzed. The manual [7] serves as a standard in the USA and provides uniformity in the procedures and policies for determining the nation's highway bridges' physical condition, maintenance needs, and load capacity. The manual is divided into eight sections, each representing a distinct phase of an overall bridge inspection and evaluation program. This tool is designed to assist bridge owners in establishing inspection procedures and evaluation practices that are consistent with the National Bridge Inspection Standards (NBIS). According to NBIS [8], road bridges have to be inspected every two years, and the assessment of the condition of bridge components is recorded in the National Bridge Inventory (NBI) database. The condition assessment of bridges in the United States is performed primarily by visual inspection. The content of the inspection of a road bridge, apart from the visual inspection, includes internal inspection, assessment of mechanical characteristics, and verification of geometric parameters. The assessment of the structural components of the bridge is based on subjective assessments of inspectors and is a single-digit number that characterizes the overall condition of the assessed component on a scale from 0 to 9 [9; 10]. In Germany, the Industrial Standard regulates the requirements for technical monitoring of the condition and testing of engineering structures on highways [11]. Monitoring and testing should provide objective information about the stability and impact of artificial structures on traffic safety. In addition, the monitoring and testing process should assess the facility's technical condition. The main goal of regular monitoring and testing is to detect defects in artificial structures that appear in time and to quickly eliminate them before they turn into severe damage and a real threat to safety arises. Monitoring the condition of artificial structures involves quarterly current observations and annual inspections.