雙頻法於箱梁外置預力非破壞檢測之應用研究

AN EXPERIMENTAL STUDY OF THE TWO-FREQUENCY METHOD FOR NONDESTRUCTIVE TESTING OF EXTERNAL PRESTRESSING TENDON ON BOX GIRDER

10.6652/JoCICHE.202104_33(2).0004

蕭勝元(Sheng-Yuan Siao)；陳俊仲(Chun-Chung Chen)；李柏翰(Bo-Han Lee)；江奇融(Chi-Rung Jiang)

外置預力鋼腱 ； 非破壞檢測 ； 雙頻法 ； external prestressing tendon ； nondestructive testing ； dual-frequency method

中國土木水利工程學刊

33卷2期（2021 / 04 / 01）

119 - 123

繁體中文

橋梁為各國之重要公共基礎設施結構，其交通運輸功能係維繫人民生活安定便捷的重要基本設施，一旦發生破壞，對於民生經濟均會造成巨大的影響，若能在平時針對橋梁結構進行檢測，將能使得主管單位及早進行適當之處置，減少或避免傷亡的發生或損失的擴大。本研究以國內一座預力混凝土箱型梁橋作為研究標的，針對箱梁內外置預力鋼腱之幾何性質、材料性質及振動行為進行調查，以振動法及套管砂漿填實度檢測作為檢測方法，檢測結果結合弦理論、梁柱理論及雙頻法進行預力值估算，分析結果可作為外置預力鋼腱現況預力值之參考。

The bridge is an essential public infrastructure structure in various countries, and its transportation function is an essential primary facility that maintains the stability and convenience of people's lives. Once damaged, it would have a significant impact on the people's livelihood economy and even cause safety problems for passers-by. If the bridge structure can test at ordinary times, it would enable the competent unit to carry out appropriate disposal as soon as possible, reduce or avoid the occurrence of casualties or the expansion of losses, and reduce the time and cost of repairing the damage. In addition to the regular visual inspection of bridges, it is also necessary to conduct further on-site inspection operations to obtain a more comprehensive picture of the current status of the bridge. In this study, a prestressed concrete box girder bridge in Taiwan used as the research target, and investigated the geometric properties, material properties and vibration behavior of the external prestressing tendon on box girder. This study applied the vibration method and casing mortar filling degree to understand the current status of the external prestressing tendon. The investigated results are used with string theory, beam-column theory and dual-frequency method for calculation of external prestressing value. The results can be used as a reference for the prestressing value of external prestressing tendon.

1. Chen, C. C.,Wu, W. H.,Chen, S. Y.,Lai, G.(2018).A novel tension estimation approach for elastic cables by elimination of complex boundary condition effects employing mode shape functions.Eng Struct,166,152-166.
2. Chen, C. C.,Wu, W. H.,Leu, M. R.,Lai, G.(2016).Tension determination of stay cable or external tendon with complicated constraints using multiple vibration measurements.Measurement,86,182-195.
3. Chen, C.-C..Determination of stay cable force based on effective vibration length accurately estimated from multiple measurements.Smart Structures and Systems,11(4),411-433.
4. Cho, S.,Lynch, J.,Lee, J.,Yun, C.(2010).Development of an automated wireless tension force development of an automated wireless tension force.J Intell Mater Syst Struct,21(3),361-376.
5. Geier, R.,De Roeck, G,Flesch, R.(2006).Accurate cable force determination using ambient vibration measurements.Struct Infrastruct Eng,2(1),43-52.
6. Hidayat, I.,Suangga, M.,Siagian, G.(2018).Validation value of cable force using the accelerometer.IOP Conference Series Earth and Environmental Science,195,012022.
7. Kim, B. H.,Park, T.,Shin, H.,Yoon, T. Y.(2007).A Comparative Study of the Tension Estimation Methods for Cable Supported Bridges.Steel Struct,7,77-84.
8. Liao, W.,Ni, Y.,Zheng, G.(2012).Tension force and structural parameter identification of bridge cables.Adv Struct Eng,15(6),983-995.
9. Yu, C.-P.(2020).Tension prediction for straight cables based on effective vibration length with a two-frequency approach.Engineering Structures,222
10. Yu, C.-P.(2013).Direct Evaluation of Effective Lengths of Vibrating Cables Using Responses from Dual/Three Transducers.Journal of Applied Science and Engineering,16(1),51-60.
11. Zui, H.,Shinke, T.,Namita, Y.(1996).Practical formula for estimation of cable tension by vibration method.J Struct Eng,122(6),651-656.
12. 陳建州(2012)。磁通量感測器應用於預力構材應力量測之研究。中國土木水利工程學刊，24(2)，157-167。