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Tension Assessment of Bridge P-T Bars Using Taut Cable Vibration Measurement (TCVM) Method

机译：使用绷紧电缆振动测量（TCVM）方法的桥P-T条张力评估

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摘要

The taut cable vibration measurement (TCVM) method determines the existing tension in taut flexible cables through vibration testing based on cable theory. The TCVM method was recently used to assess tension forces in 416 post-tensioning (P-T) bars on nine different bridges in Maryland. These included 336 P-T bars for retrofitting cracks in the hammerhead-shaped reinforced concrete pier caps of seven multi-girder bridges and 80 P-T bars for retrofitting cracks at pin connections of two steel rhomboid girder bridges. Since no literature was available on application of the TCVM method for P-T bars, especially considering the grout-filled double PVC sheathing corrosion protection system on them, field calibration tests were performed to validate its suitability and accuracy. It was found that the TCVM method is able to estimate the existing tension in the P-T bars with an accuracy of within 5%. This paper discusses the concept of TCVM, its application for tension assessment of bridge P-T bars, special considerations for the fast fourier transform (FFT), results of the calibration test, and a recommended procedure.
机译：绷紧电缆振动测量（TCVM）方法通过基于电缆理论的振动测试来确定绷紧柔性电缆的现有张力。最近使用TCVM方法在马里兰州的九个不同桥梁上评估416张张紧（P-T）杆的张力。其中包括336个P-T条，用于改装七个多梁桥梁的锤头形钢筋混凝土墩盖和80 p-T条的裂缝，用于改装两个钢菱形梁桥的销连接的裂缝。由于在适用于P-T杆的TCVM方法没有文献，特别是考虑到灌浆的双PVC护套腐蚀保护系统，因此进行了现场校准测试以验证其适用性和准确性。发现TCVM方法能够估计P-T条中的现有张力，精度为5％。本文讨论了TCVM的概念，其对桥梁P-T条张力评估的应用，快速傅里叶变换（FFT）的特殊考虑，校准测试的结果，以及推荐的过程。

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