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Damage detection of an innovative composite slab-girder pedestrian bridge using vibration characteristics
Structure and Infrastructure Engineering ( IF 3.7 ) Pub Date : 2021-02-01 , DOI: 10.1080/15732479.2021.1880447
Saima Ali 1 , David Thambiratnam 1 , Sabrina Fawzia 1 , Khac Duy Nguyen 1 , Haden Van Den Elsen 1 , Ignacio Alvear Fujii 1
Affiliation  

Abstract

This paper aims to detect and locate damage in an innovative slab-on-girder pedestrian bridge model using the vibration characteristics determined from a combined experimental–numerical procedure. The innovative slab-girder pedestrian bridge model has a bi-layer composite deck with Glass Fiber Reinforced Polymer as the bottom layer and laminated glass as the top layer to exploit the desirable properties of these two materials. Modal data from experimental tests and numerical analyses of the bridge model under single and multiple damage cases together with the modal flexibility method are used to detect and locate damage in the bridge. Results show that the peaks of the model flexibility plots correctly locate the damage and that their values provide a good indication of damage severity, which depend on the number of damages, damaged member and location of damage. Results show that the early vibration modes of this bridge model are dominant in torsion, different to flexure dominant modes in traditional slab-girder bridges. Nevertheless, the combined experimental-numerical procedure is found to be effective for assessing both single and multiple damages in the innovative bridge model. The adopted procedure will be applicable to similar real bridge structures in future investigations and will contribute to their safety.



中文翻译:

基于振动特性的新型复合板梁人行桥损伤检测

摘要

本文旨在利用结合实验-数值程序确定的振动特性,检测和定位创新的梁式人行桥模型中的损伤。创新的板梁式人行桥模型具有双层复合桥面,底层为玻璃纤维增​​强聚合物,顶层为夹层玻璃,以利用这两种材料的理想特性。桥梁模型在单个和多个损伤情况下的试验测试和数值分析的模态数据以及模态柔度法用于检测和定位桥梁中的损伤。结果表明,模型灵活性图的峰值正确地定位了损坏,并且它们的值提供了损坏严重程度的良好指示,这取决于损坏的数量,损坏的构件和损坏的位置。结果表明,该桥模型的早期振动模式以扭转为主,不同于传统板梁桥的以弯曲为主的模式。然而,实验-数值相结合的程序被发现对于评估创新桥梁模型中的单个和多个损坏都是有效的。所采用的程序将适用于未来调查中类似的真实桥梁结构,并将有助于其安全。

更新日期:2021-02-01
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