Accurate cable force determination using ambient vibration measurements

Geier, Roman; Roeck, Guido De; Flesch, Rainer

doi:10.1080/15732470500253123

Cited by 68 publications

(48 citation statements)

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“…The extraction of modal parameters is not an end in itself but, rather, can lead to solutions to complex problems. In the field of civil engineering, for example, it can help understand and contribute to mitigation solutions for the lateral pedestrian excitation of bridges 1, it can be used to design dampers to mitigate excessive movement of structures and monitor their performance 2 and it can be used to estimate the loads in cables 3. There are many more examples in all fields of engineering.…”

Section: Introductionmentioning

confidence: 99%

Investigation and Comparison of the Mechanistic Steps in the [(CpMCl₂)₂] (Cp=C₅Me₅; M=Rh, Ir)‐Catalyzed Oxidative Annulation of Isoquinolones with Alkynes

Wang

Song

et al. 2012

Chemistry A European J

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The mechanism of the [(Cp*MCl(2))(2)] (M = Rh, Ir)-catalyzed oxidative annulation reaction of isoquinolones with alkynes was investigated in detail. In the first acetate-assisted C-H-activation process (cyclometalated step) and the subsequent mono-alkyne insertion into the M-C bonds of the cyclometalated compounds, both Rh and Ir complexes participated well. However, the desired final products, dibenzo[a,g]quinolizin-8-one derivatives, were only formed in high yield when the Rh species participated in the final oxidative coupling of the C-N bond. Moreover, a Rh(I) sandwich intermediate was isolated during this transformation. The iridium complexes were found to be inactive in the oxidative coupling processes. All of the relevant intermediates were fully characterized and determined by single-crystal X-ray diffraction analysis. Based on this mechanistic study, a Rh(III)→Rh(I)→Rh(III) catalytic cycle was proposed for this reaction.

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Section: Introductionmentioning

confidence: 99%

Investigation and Comparison of the Mechanistic Steps in the [(CpMCl₂)₂] (Cp=C₅Me₅; M=Rh, Ir)‐Catalyzed Oxidative Annulation of Isoquinolones with Alkynes

Wang

Song

et al. 2012

Chemistry A European J

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“…To reduce the estimation error of the vibration‐based method, Geier et al . presented a method to determine the cable tension based on modal analysis and used the method to determine cable tension for the Danube Channel Bridge . Park et al .…”

Section: Introductionmentioning

confidence: 99%

Real-time identification of time-varying tension in stay cables by monitoring cable transversal acceleration

Zhang

Jin

2013

Struct. Control Health Monit.

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SUMMARYStay cables are critical components in bridges. However, stay cables suffer from severe fatigue damage. Therefore, a monitoring technique to obtain the time history of the tension in stay cables is important. Because the acceleration of stay cables is readily measurable, approaches to identify cable tension based on frequency analysis and monitored cable acceleration have been widely investigated and used in practice. However, this type of approach can only identify a time‐invariant tension of a stay cable over a specified duration, not the time‐varying tension. This paper proposes an approach to identify the time‐varying tension of stay cables by monitoring cable accelerations. The tension variation in stay cables is caused by vehicles passing over the bridge. The real‐time identification algorithm that determines the time‐varying tension of stay cables is proposed using an extended Kalman filter based on both the transversal monitored acceleration at a single location on the cable and the monitored wind speed on the bridge, where the time‐varying tension is a state variable that is identified. A stay cable from the Nanjing Yangtze River No. 3 Bridge was used for the numerical study. The time‐varying tension of the stay cable can be identified when either a single vehicle or multiple vehicles pass over the bridge. The robustness of the proposed approach is also investigated through deviations in the initial tension, initial displacement, and velocity of the stay cable. An experiment was conducted on a scaled stay cable with time‐varying tension excited by wind. The time‐varying cable tension of the cable was identified by the proposed approach and compared with the real time‐varying cable tension. The identification accuracy and robustness of the proposed approach is verified through the experiment and numerical study. Copyright © 2013 John Wiley & Sons, Ltd.

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“…Generally speaking, the values T N opt are rather stable with respect to N. With the exception of the estimate obtained with N ¼ 1 for groups 1D and 1U, maximum deviations are of about 1-2 % the average value T avg opt ¼ 1 N P N i¼1 T i opt for each cable. The overestimates associated to the fundamental frequency in longer cables belonging to groups 1D and 1U are often related in the literature to the effect of the cable sag [9].…”

Section: Test Measurements and Their Interpretationmentioning

confidence: 99%

Ambient vibration testing and structural identification of a cable-stayed bridge

2016

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The paper presents the results of an experimental and theoretical investigation on the Pietratagliata cable-stayed bridge (Udine, Italy). Ambient vibration tests were performed in order to estimate the dynamic characteristics of the lower vibration modes of the bridge. Structural identification is carried out by means of a manual tuning procedure based on finite element models of increasingly accuracy. The analysis allows to improve the description of boundary conditions and mechanical interaction between the bridge components. Results from local dynamic testing are used to estimate the traction on the cables and to assess the integrity of the suspending system of the bridge.

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Accurate cable force determination using ambient vibration measurements

Cited by 68 publications

References 1 publication

Investigation and Comparison of the Mechanistic Steps in the [(CpMCl₂)₂] (Cp=C₅Me₅; M=Rh, Ir)‐Catalyzed Oxidative Annulation of Isoquinolones with Alkynes

Investigation and Comparison of the Mechanistic Steps in the [(CpMCl₂)₂] (Cp=C₅Me₅; M=Rh, Ir)‐Catalyzed Oxidative Annulation of Isoquinolones with Alkynes

Real-time identification of time-varying tension in stay cables by monitoring cable transversal acceleration

Ambient vibration testing and structural identification of a cable-stayed bridge

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Accurate cable force determination using ambient vibration measurements

Cited by 68 publications

References 1 publication

Investigation and Comparison of the Mechanistic Steps in the [(Cp*MCl2)2] (Cp*=C5Me5; M=Rh, Ir)‐Catalyzed Oxidative Annulation of Isoquinolones with Alkynes

Investigation and Comparison of the Mechanistic Steps in the [(Cp*MCl2)2] (Cp*=C5Me5; M=Rh, Ir)‐Catalyzed Oxidative Annulation of Isoquinolones with Alkynes

Real-time identification of time-varying tension in stay cables by monitoring cable transversal acceleration

Ambient vibration testing and structural identification of a cable-stayed bridge

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Product

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Investigation and Comparison of the Mechanistic Steps in the [(CpMCl₂)₂] (Cp=C₅Me₅; M=Rh, Ir)‐Catalyzed Oxidative Annulation of Isoquinolones with Alkynes

Investigation and Comparison of the Mechanistic Steps in the [(CpMCl₂)₂] (Cp=C₅Me₅; M=Rh, Ir)‐Catalyzed Oxidative Annulation of Isoquinolones with Alkynes