Structural identification, damage detection by non-destructive tests and determining axial loads in cables

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2009

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Yücel, Mustafa Can

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Damage and condition identiﬁcation of existing structures using non-destructive tests is a common challenge that has been worked on for a long time. In this study, two diﬀerent methods were developed to ﬁnd existing force on cables as well as determine bending characteristics (EI coeﬃcients) of beam like structures (such as bridges). Comparing forces in symmetrically placed cables or against values obtained from design drawings would indicate structural imbalance as well as ﬁnding EI coeﬃcients at a number of segments on a bridge girder might indicate weak regions that might possibly have undergone structural damage, having weak connections, lost composite action etc. With the help of the proposed algorithm, the stiﬀness parameters of bridges can be assessed and the location of any damage that is in the magnitude which can aﬀect displacement behavior of system can be located. The developed methods are demonstrated using the values analytically obtained from the created models and the eﬀectiveness of the algorithm is criticized. Furthermore, several damage scenarios on a scaled lab beam was used to test the application using real experimental data; including tests on undamaged beam (for identiﬁcation) and tests on the damaged beam. Additional experiments were conducted on a cable stretched in the laboratory instrumented using a load cell to measure instantaneous axial load on the cable and compare these values against the values obtained from the developed tension measurement device. The results are compared and conclusions are derived.

Subject Keywords

Civil engineering.

URI

http://etd.lib.metu.edu.tr/upload/12611278/index.pdf
https://hdl.handle.net/11511/19239

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

M. C. Yücel, “Structural identification, damage detection by non-destructive tests and determining axial loads in cables,” M.S. - Master of Science, Middle East Technical University, 2009.