Abstract

Bridge condition rating is a crucial variable used for prioritisation of bridge needs in bridge management systems (BMSs). At present, bridge rating is predominantly based on visual inspections. A practical method incorporating non-destructive testing (NDT) results for rating bridges in a BMS is not available. In this study, an integrated rating method for reinforced concrete bridges based on both visual inspection and multiple NDT techniques with the ultimate goal of incorporating it into BMSs was developed. The method uses a multi-component and multi-modal NDT application at network-level with improved testing speed. The application results of four non-destructive techniques including visual inspection, polarisation resistance, penetration resistance, and pulse velocity on a reinforced concrete bridge network of 100 bridges are presented. At bridge level, a multi-component approach was used, including decks, girders, cap beams, piers, and abutments. A novel method for NDT-based reinforcement corrosion rating was developed. Correlation among NDT variables was also investigated and the results are presented. Multiple linear regression models were developed using ANOVA analyses. Only the statistically significant regressors with the largest partial F-statistic were included in the model formulas. The expected weights of the four evaluation criteria in the formula were obtained by combining the results of two techniques: statistical data available in literature on the frequency of use of NDT techniques for bridge inspection, and a three-level analytical hierarchy process (AHP) based on expert survey. Application of three NDT techniques to inspections of concrete bridges, determination of NDT ratings using the integrated rating formula, and incorporation of the resulting ratings into a BMS for bridge ranking can be performed using the proposed methodology.

摘要

桥梁状况评级是桥梁管理系统 (BMS) 中用于确定桥梁需求优先级的关键变量。目前，桥梁评级主要基于目视检查。目前还没有结合无损检测 (NDT) 结果的实用方法对 BMS 中的桥梁进行评级。在这项研究中，开发了一种基于目视检查和多种 NDT 技术的钢筋混凝土桥梁综合评级方法，最终目标是将其纳入 BMS。该方法在网络级使用多组件和多模态无损检测应用程序，提高了测试速度。介绍了外观检查、抗极化、抗穿透和脉冲速度四种无损技术在100座桥梁钢筋混凝土桥网上的应用结果。在桥梁层面，使用了多组件方法，包括桥面板、大梁、帽梁、桥墩和桥台。开发了一种基于无损检测的钢筋腐蚀评级的新方法。还研究了无损检测变量之间的相关性，并给出了结果。多元线性回归模型是使用 ANOVA 分析开发的。模型公式中仅包含具有最大偏 F 统计量的统计显着回归量。公式中四个评价标准的预期权重是通过结合两种技术的结果获得的：文献中关于桥梁检查无损检测技术使用频率的统计数据，以及基于三级层次分析法（AHP）在专家调查中。三种无损检测技术在混凝土桥梁检测中的应用