應用位移量測技術識別預力梁預力之可行性研究

樊鵬

doi:10.6342/NTU201603577

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應用位移量測技術識別預力梁預力之可行性研究

Feasibility Study of Applying the Deflection Measurement Technology to Identify the Prestress Force in Pre-stressed Concrete Beams

樊鵬 , Masters　　Advisor：張國鎮　　

繁體中文 DOI： 10.6342/NTU201603577

空間構架；預力檢測；預力梁；位移量測；預力損失； space frames ； prestress force identification ； pre-stressed beams ； deflection measurement ； prstress losses

Abstract │ Reference (28) │ Altmetrics

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To administrate the full lifecycle of bridge beams, it is necessary to grasp the reasons of damages in bridge members. Pre-stressed beams are broadly applied in the urban, railway and highway bridges, during the design process, prestress forces are decided through existing norms or theoretical formula. Within their serviceability life, after the construction, many factors such as relaxation of tendons, shrinkage and creep of concrete, friction between tendons and tendon ducts, anchorage slip and ambient temperature can lead to the change of the applied pre-stress forces. So, in order to control the status of pre-stressed bridges, the identification of prestress force is inevitable.
This study conducted the theoretical testify in space frames to make a clear judge of the feasibility of these non-destructive methods mentioned in this paper. Subsequently, by using displacements measured after applying a vertical load in the mid-span of the beam, the identification of prestress force can be made on pre-stressed steel box beam and pre-stressed concrete beam, respectively. Post-tensioning method is considered during the experimental tests. Axial force, which is prestress force, can be estimated by using displacements measured in certain sections and the formula of axial buckling load. Comparing estimated axial force with existing axial force, which is measured by a load cell at one end of the beam, it is possible to verify the feasibility of axial force identification proposed in this study and then, enlarge the size of specimen and plan for further study in the near future.

Reference ( 28 ) 〈TOP〉

[1] Beconcini M. L. Un metodo pratico per la determinazione del tiro nelle catene. Costruire in laterizio, 54/96 299-301, 1996.
連結：
[2] Briccoli Bati S., Tonietti U. Experimental methods for estimating in situ tensile force in tie-rods. Journal of Engineering Mechanics, 1275-1283, 2001.
連結：
[3] Briccoli Bati S., Puccetti P., Tonietti U. Experimental methods for testing the pull tension in chains. Hallay C., Kulcsar P. (Eds.), Proceedings of the 13th World Conference on Non-Destructive Testing, Amsterdam, Elsevier, 1259-1263, 1992.
連結：
[5] Tullini N., Rebecchi G., Laudiero F. Bending tests to estimate the axial force in tie-rods. Mechanics Research Communications, 44 57-64, 2012.
連結：
[6] Blasi C., Sorace S. Determining the axial force in metallic rods. Structural Engineering International, 4 (4) 241-246, 1994.
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