USING NON-DESTRUCTIVE TESTS FOR EVALUATING FLYOVER FOOTBRIDGE: CASE STUDY

A. Shubbar, Z. Al-khafaji, M. Nasr, M. Falah
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引用次数: 17

Abstract

The concrete structures deterioration in the last few decades required effective methods for evaluating and maintaining the structure condition. Currently, assessing the performance and safety of reinforced concrete (RC) structures relies on routine-based visual inspection (VI). However, there are another non-destructive test (NDT) technique that can provide a more accurate assessment of the structures. Thus, in this study, a footbridge located in Liverpool, UK is chosen as a case study and has NDT techniques used for assessment. The main objective of this research is to determine the condition of structural bridge components and investigate its level of defect and deterioration using non-destructive tests. The methodologies involved are visual inspection, and NDT techniques include the rebound hammer, cover meter, Moisture Content & Depth of Carbonation Testing, Chloride Testing and Half Cell Test. The framework, when implemented with the best selection of NDT techniques, helps in determining the level of defect and deterioration of the structural bridge components and next recommendation regarding the condition of the bridge. The involved bridge structural components include column, deck, wall and staircase. Findings from the visual inspection show that there were many defects and deteriorations found at the structural bridge components, which includes crack, spalling, and delamination and rusting. Further, NDT techniques that were carried out at the selected bridge structural part shows that some of the components exhibited a moderate risk of corrosion and acceptable concrete surface quality. In general, further maintenance is needed specifically to some critical structural components of the bridge.
使用无损测试评估天桥行人天桥:个案研究
近几十年来混凝土结构的劣化需要有效的方法来评估和维护结构状态。目前,评估钢筋混凝土(RC)结构的性能和安全性依赖于基于常规的目测(VI)。然而,有另一种无损检测(NDT)技术可以提供更准确的结构评估。因此,在本研究中,选择位于英国利物浦的一座人行桥作为案例研究,并使用无损检测技术进行评估。本研究的主要目的是确定桥梁结构部件的状况,并使用无损检测来调查其缺陷和恶化程度。所涉及的方法是目视检查,无损检测技术包括回弹锤、覆盖计、碳酸化含水率和深度测试、氯化物测试和半电池测试。当采用最佳无损检测技术实施该框架时,有助于确定桥梁结构部件的缺陷和恶化程度,并就桥梁状况提出下一步建议。涉及的桥梁结构构件包括柱、桥面、墙和楼梯。目测结果表明,桥梁构件存在裂纹、剥落、分层和锈蚀等缺陷和劣化现象。此外,在选定的桥梁结构部分进行的无损检测技术表明,一些部件显示出适度的腐蚀风险,混凝土表面质量可接受。一般来说,需要对桥梁的一些关键结构部件进行进一步的维护。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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