Performance indicators for road bridges - overview of findings and future progress
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Summary
This paper outlines the findings of Working Group 1 within the COST Action TU 1406, which aims to develop guidelines for Quality Control (QC) plans in roadway bridges. The primary objective is to establish a standardized methodology for assessing bridge performance by integrating recent knowledge on performance assessment with specific performance goals. This initiative seeks to improve asset management strategies for aging European infrastructure by moving beyond country-specific practices toward a harmonized European perspective. The work focuses on two levels: defining performance indicators (PIs) and establishing performance goals, with potential incorporation of sustainable performance metrics. The methodology involved creating and analyzing two databases: an operators’ database derived from surveying bridge maintenance, assessment, and management documents across various European countries, and a research-based database compiled from scientific literature. The core of the survey process utilized an Excel-based interface structured around four main groups: performance level, damage, performance indicator/index, and performance assessment. Due to the heterogeneous nature of the collected data, resulting from differing expert interpretations and national policies, the authors employed clustering and homogenization techniques. This process reduced over 700 distinct terms to 385 clustered terms, facilitating a common understanding of PIs. A glossary of key terms was also developed to standardize terminology related to performance indicators, goals, thresholds, and methods. The analysis revealed that the condition index (or condition rating) is the most widely used performance indicator across Europe, primarily derived from visual inspections. While most countries rely solely on this metric, nations like Denmark and the Netherlands utilize additional indicators such as remaining service life, reliability, availability, maintainability, and safety (RAMS), as well as social, environmental, and economic indicators. To refine the database, an Expert Group evaluated approximately 100 extricated PIs based on measurability, quantifiability, and decision-making utility. These were categorized into Key Performance Indicators (KPIs) including Reliability, Availability, Maintainability, Safety, Security, Environment, Costs, Health, Politics, and Rating/Inspection. The study proposes a framework for assigning rating values (1–5) and weighting factors to these KPIs at component, system, and network levels, considering technical, sustainability, and socio-economic aspects. The significance of this work lies in its contribution to the harmonization of bridge performance assessment across Europe. By clustering and homogenizing diverse national indicators, the study provides a foundation for defining quality specifications and control plans that can be adopted universally. The proposed categorization and rating system allows for a more comprehensive evaluation of bridge performance, linking specific indicators to broader performance goals. This approach supports more effective lifecycle management and maintenance decision-making, ultimately enhancing the safety and reliability of the European road bridge network. The findings serve as a precursor to further work on defining specific performance goals and establishing detailed QC plans.
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | OpenAlex-citations | — | — | 1 | 2026-06-25 |
| archive | success | unpaywall | — | — | 2 | 2026-06-26 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-25 |
| chunk | success | chunk | — | — | 1 | 2026-06-25 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-25 |
| promote | success | — | — | — | 1 | 2026-06-25 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-25 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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