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논문 기본 정보

자료유형
학술저널
저자정보
Ahmet Can Altunișik (Karadeniz Technical University) Alemdar Bayraktar (Karadeniz Technical University) Barış Sevim (Yıldız Technical University)
저널정보
한국계산역학회 Computers and Concrete, An International Journal Computers and Concrete, An International Journal Vol.12 No.6
발행연도
2013.12
수록면
803 - 818 (16page)

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In this study, analytical and experimental modal analyses of a scaled bridge model are carried out to extract the dynamic characteristics such as natural frequency, mode shapes and damping ratios. For this purpose, a scaled bridge model is constructed in laboratory conditions. Three dimensional finite element model of the bridge is constituted and dynamic characteristics are determined, analytically. To identify the dynamic characteristics experimentally; Experimental Modal Analyses (ambient and forced vibration tests) are conducted to the bridge model. In the ambient vibration tests, natural excitations are provided and the response of the bridge model is measured. Sensitivity accelerometers are placed to collect signals from the measurements. The signals collected from the tests are processed by Operational Modal Analysis; and the dynamic characteristics of the bridge model are estimated using Enhanced Frequency Domain Decomposition and Stochastic Subspace Identification methods. In the forced vibration tests, excitation of the bridge model is induced by an impact hammer and the frequency response functions are obtained. From the finite element analyses, a total of 8 natural frequencies are attained between 28.33 and 313.5 Hz. Considering the first eight mode shapes, these modes can be classified into longitudinal, transverse and vertical modes. It is seen that the dynamic characteristics obtained from the ambient and forced vibration tests are close to each other. It can be stated that the both of Enhanced Frequency Domain Decomposition and Stochastic Subspace Identification methods are very useful to identify the dynamic characteristics of the bridge model. The first eight natural frequencies are obtained from experimental measurements between 25.00-299.5 Hz. In addition, the dynamic characteristics obtained from the finite element analyses have a good correlation with experimental frequencies and mode shapes. The MAC values obtained between 90-100% and 80-100% using experimental results and experimental-analytical results, respectively.
#ambient vibration #bridge model #dynamic characteristic #enhanced frequency domain decomposition #finite element model #operational modal analysis #stochastic subspace identification

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참고문헌 (33)

참고문헌 신청
Altunışık, A. C. / 2010 / Determination of structural behavior of highway bridges using analytical and experimental methods google schola Ahmet Can Altuni sik / 2010 / Finite element model updating of an arch type steel laboratory bridge model using semi-rigid connection / Steel and Composite Structures, An International Journal 10(6):541~561 dbpia Altunışık, A. C. / 2011 / Ambient vibration based seismic evaluation of isolated Gülburnu Highway Bridge / Soil Dyn. Earthq. Eng 31(11):1496~1510 google schola Altunışık, A. C. / 2011 / Experimental and analytical system identification of eynel arch type steel highway bridge / J. Constr. Steel Res 67(12):1912~1921 google schola Bagchi, A. / 2005 / Updating the mathematical model of a structure using vibration data / Vib. Control 11(12):1469~1486 google schola

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