PC Tendon Damage Detection Based on Change of Phase Space Topology
PC Tendon Damage Detection Based on Change of Phase Space Topology
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DOI：
10.3151/jact.16.416
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发表时间：
2018-08
影响因子：
2
通讯作者：
P. Tuttipongsawat;E. Sasaki;Keigo Suzuki;T. Kuroda;K. Takase;M. Fukuda;Y. Ikawa;Koji Hamaoka
中科院分区：
文献类型：
--
作者：
P. Tuttipongsawat;E. Sasaki;Keigo Suzuki;T. Kuroda;K. Takase;M. Fukuda;Y. Ikawa;Koji Hamaoka
预应力混凝土筋是预应力混凝土结构的重要组成部分。然而，当它退化或损坏时，由于其从外部不可见，因此没有警告标志。基于振动的损伤检测方法因其简单性而成为损伤检测技术之一。然而，广泛使用的方法，如基于模态的分析仍然是不敏感的这种损伤。近年来，基于相空间分析的损伤识别方法被广泛应用于土木工程领域，并提出了一种新的损伤识别指标--相空间拓扑变化（CPST）。无论损伤位置如何，该方法都能有效地识别损伤的存在.因此，本文采用这种技术来研究PC筋的损伤。试验采用人工预应力筋损伤的先张法混凝土梁，进行了自振和冲击锤激振试验。CPST值和基于模态的分析结果进行了调查和比较。该指数随着受损程度的增加而呈上升趋势。此外，它对PC肌腱损伤比基于模态的分析结果更敏感。提示CPST可作为检测PC肌腱损伤的有效指标。
PC tendon is a vital component for strength of prestressed concrete structure. However, there is no warning sign when it is degraded or damaged, because of its invisibility from outside. Vibration-based method is one of the technique for damage detection due to simplicity. However, the extensively used method such as modal-based analysis is still insensitive to such damages. Recently, phase space-based analysis, a novel method for damage detection, was adopted in Civil engineering and a new index called Change of Phase Space Topology (CPST) has been developed. It is effective in identifying the damage existence regardless a known of damage location. Therefore, this paper adopted such technique to investigate damages of PC tendon. A pretension concrete girder with artificial PC tendon damages was used in experiment and it was excited by two vibration tests; free vibration and impact hammer test. The CPST values and the results from modal-based analysis were investigated and compared. The index shows increasing trend with increasing of damage levels. Moreover, it is more sensitive to the PC tendon damages than the results from modal-based analysis. This implies that CPST might be an effective index to detect the damages of PC tendon.