Anis Shafiqah Azhar, Sakhiah Abdul Kudus, Adiza Jamadin, Shaiful Amir Leman
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引用次数: 0
摘要
SHM 的应用范围已扩大到现有桥梁的维护问题,这些桥梁已使用多年,并暴露在环境因素中。本文旨在展示 SHM 在老化结构维护和管理中的有效性,特别是马来西亚的一座普拉特桁架钢桥。研究结合了静态和动态方法来描述古桥的适用性。首先使用运行模态分析和 FE 分析来评估结构的固有频率和模态振型,然后采用基于灵敏度的模型更新方法。接下来,利用位移和应变数据自动进行静态测量,以评估桥梁的状况。研究结果表明,老化钢桁架桥的前四个关键弯曲和扭转模态发生在 4 到 29 Hz 之间。由于两种方法产生的 MAC 值和频率不同,因此有必要采用敏感性分析和模型更新程序。然后,使用 EN1991-2:2003 桥梁频率约束条件生成的频率参考值来确定桥梁的完整性,得出的结论是桥梁是安全和正常的。最后,静态分析结果表明,就其挠度极限和应变极限而言,桥梁处于安全的使用状态。
Enhanced structural health monitoring of ageing Pratt truss bridges: a combined approach of static and dynamic measurements
The application of SHM has been broadened to the issues of preserving existing bridges, which are subjected to many years of usage and exposure to environmental factors. This paper aims to demonstrate the effectiveness of SHM in the maintenance and management of ageing structures, specifically a Pratt-truss steel bridge in Malaysia. The research combines static and dynamic methodologies to describe the ancient bridge’s serviceability. Operational modal analysis and FE analysis were first used to evaluate the structure's inherent frequencies and mode shapes, followed by a successful sensitivity-based model updating method. Next, static measurements were automated using displacement and strain data to evaluate the bridge’s condition. According to the study, the first four crucial bending and torsion modes for the ageing steel truss bridge occur between 4 and 29 Hz. Since the two approaches yield different MAC values and frequencies, employing a sensitivity analysis and model update procedure has become necessary. The frequency reference generated with EN1991-2:2003 bridge frequency constraints was then used to determine the bridge’s integrity, concluding that the bridge is safe and functional. Finally, the static analysis findings showed that the bridge is in a safe service condition regarding its deflection limit and strain limit.
期刊介绍:
The Journal of Civil Structural Health Monitoring (JCSHM) publishes articles to advance the understanding and the application of health monitoring methods for the condition assessment and management of civil infrastructure systems.
JCSHM serves as a focal point for sharing knowledge and experience in technologies impacting the discipline of Civionics and Civil Structural Health Monitoring, especially in terms of load capacity ratings and service life estimation.