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Level 2 safety evaluation of concrete-filled steel tubular arch bridges incorporating structural health monitoring and inspection information based on China bridge standards

机译：根据中国桥梁标准，结合结构健康监测和检查信息，对钢管混凝土拱桥进行二级安全评估

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摘要

Concrete-filled steel tubular (CFST) arch bridges have been widely used in mainland China, and their systematic safety evaluation has gained increasing attention from the bridge authorities in recent years. This paper presents the framework and application of Level 2 safety evaluation of CFST arch bridges, incorporating structural health monitoring (SHM) and inspection information. In contrast with the traditional inspection-based qualitative assessment and direct measurement-based quantitative assessment for SHM, Level 2 safety evaluation considers the inevitable resistance deterioration and site-specific loading under normal operation conditions. For such safety evaluations, the most important element is using the well-established finite element modelling for representing the actual conditions as accurately as possible. Thus, in this study, component and global finite element model (FEM) updating techniques are employed to ensure the local and global behaviour of the updated FEM, through which several types of common CFST arch bridge defects are investigated and updated. Measured site-specific live loads experienced by CFST arch bridges are considered and transformed into design loads for comparison. Unfavourable load patterns are applied to the updated FEM for structural reanalysis, to evaluate the component safety status, and gradually increasing unfavourable load patterns are applied to the FEM to perform an ultimate load-bearing analysis to obtain the global safety reservation. Level 2 safety evaluation is conducted by considering modal parameters, displacements, fatigue damage, and component and global safety status. Level 2 safety evaluation is applied to a typical CFST arch bridge, to demonstrate the entire evaluation process and the effectiveness of the proposed safety evaluation framework.
机译：钢管混凝土（CFST）拱桥已在中国大陆广泛使用，其系统的安全性评估近年来受到了桥梁当局的越来越多的关注。本文介绍了CFST拱桥2级安全评估的框架和应用，并结合了结构健康监测（SHM）和检查信息。与传统的基于SHM的基于检查的定性评估和基于直接测量的定量评估相比，二级安全评估考虑了正常运行条件下不可避免的电阻劣化和特定地点的负荷。对于此类安全评估，最重要的元素是使用公认的有限元模型来尽可能准确地表示实际状况。因此，在这项研究中，采用组件和全局有限元模型（FEM）更新技术来确保更新后的FEM的局部和全局行为，从而研究和更新几种常见的CFST拱桥缺陷。考虑了CFST拱桥所测量的特定于现场的活荷载，并将其转换为设计荷载以进行比较。将不利的载荷模式应用于更新后的FEM以进行结构重新分析，以评估组件的安全状态，然后逐渐增加的不利的载荷模式应用于FEM，以进行最终的承载力分析以获得全局安全性保留。通过考虑模态参数，位移，疲劳损伤以及组件和整体安全状态来进行2级安全评估。将2级安全评估应用于典型的CFST拱桥，以演示整个评估过程以及所提出的安全评估框架的有效性。

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