A theoretical and experimental evaluation of the modal properties of a cable-stayed footbridge

Drygala, Izabela Joanna; Dulińska, Joanna

doi:10.1016/j.proeng.2017.09.347

Cited by 9 publications

(10 citation statements)

References 5 publications

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“…In work [20], numerical and experimental evaluations of the modal properties of a cable-stayed footbridge are presented. The investigation was carried out on a slender, cable-stayed footbridge whose primary purpose is to transport pedestrians above the river.…”

Section: Related Workmentioning

confidence: 99%

“…A set of mathematical tools and functions was applied for the analysis of the obtained signals [20]. For the first modal model (see Figure 1), the theory of random vibrations was used [30,31].…”

Section: Preliminariesmentioning

confidence: 99%

“…Then, for estimated eigenvalues, the mode shapes, as well as the logarithmic decrements of damping, were obtained. At this stage of the study, the band-pass filter was applied [20].…”

Section: Preliminariesmentioning

confidence: 99%

“…Taking into consideration the primary function of the pedestrian bridges, the risk of the resonance phenomenon occurring has to be discussed for this type of structure [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In general, the estimation of the modal properties of footbridges is the main component of the general dynamic evaluation of these structures [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Full-Scale Experimental and Numerical Investigations on the Modal Parameters of a Single-Span Steel-Frame Footbridge

Drygala

Dulińska

2019

Symmetry

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In this work, an examination on the modal properties of a single-span steel-frame footbridge is presented. The footbridge is situated in Jawornik (Lesser Poland). The footbridge is symmetrical since its main structure consists of two steel frames of the same shape. The boundary conditions for both frames are the same as well. The study was completed on the basis of numerical as well as experimental investigations. For finite element (FE) analysis, a 3-D model of the single-span steel-frame footbridge was created. For the experimental study, a research scheme for in situ tests was developed. Three kinds of excitation techniques were used during the in situ tests: shock excitation, operational vibration, and slow sine sweep testing. Different functions that estimate natural frequencies, i.e., the power spectral density function (PSD) and the frequency response function (FRF), were applied. The modal assurance criterion (MAC) was used as a mathematical tool for the verification of the mode shapes of natural vibrations obtained in experimental and numerical ways. Good compatibility was recognized between the results obtained for experimental and numerical procedures in terms of both the natural frequency and the mode of vibration. The identified and verified values of the five consecutive natural frequencies of the footbridge were smaller than 5 Hz, but they were recognized as being located outside the frequency range defined as having “maximum risk of resonance". The numerical and experimental modal analysis revealed that all modes corresponding to the natural frequencies from the 0–5 Hz range have both a symmetrical and an anti-symmetrical nature. In particular, the first vertical mode, which can play a central role from the serviceability of the footbridge point of view has a symmetrical shape. The results of the research might be applicable to the dynamic study of the structure type considered in the analysis, i.e., for the dynamic assessment of a single-span steel-frame footbridge with a relatively large mass as well as stiffness. The investigation proved that ambient vibration modal experiments are enough for the experimental investigation of the modal properties of the structure.

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Section: Related Workmentioning

confidence: 99%

Section: Preliminariesmentioning

confidence: 99%

“…Then, for estimated eigenvalues, the mode shapes, as well as the logarithmic decrements of damping, were obtained. At this stage of the study, the band-pass filter was applied [20].…”

Section: Preliminariesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Full-Scale Experimental and Numerical Investigations on the Modal Parameters of a Single-Span Steel-Frame Footbridge

Drygala

Dulińska

2019

Symmetry

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“…Although, static loading as well as serviceability requirements are important considerations, dynamic problems are much more challenging in the designing of pedestrian bridges. It must be pointed out, that the application of unconventional materials, technologies and optimisation methods has an influence on the dynamic behaviour of pedestrian bridges [1][2][3][4][5]. Because of their properties, e.g.…”

Section: Introductionmentioning

confidence: 99%

Assessment of human-induced vibrations of a cable-stayed footbridge

Drygala

Dulińska

Wazowski³

2018

MATEC Web Conf.

Self Cite

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The primary purpose of this research is the evaluation of human-induced vibrations of a cable-stayed footbridge. The cable-stayed pedestrian bridge with total length of the span equal to 46.90 m located in Czestochowa (Southern Poland) was chosen as a case study. The footbridge consists of two spans (21.10 m and 25.80 m). A three-dimensional (3D) finite element (FE) model of the footbridge was prepared with the ABAQUS software program. The dynamic properties of the structure, i.e. its natural frequencies, modes shapes and damping ratios, were estimated on the basis of the in situ tests results as well as numerical analysis. For the validation of the modal models the modal assurance criterion (MAC) theory was applied. In the next stage of the investigation the dynamic response of the structure to human-induced loading was evaluated. Finally, the vibration comfort criteria for the footbridge were checked.

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Measured dynamic properties for FRP footbridges and their critical comparison against structures made of conventional construction materials

Wei

Russell

Živanović

et al. 2019

Composite Structures

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A theoretical and experimental evaluation of the modal properties of a cable-stayed footbridge

Cited by 9 publications

References 5 publications

Full-Scale Experimental and Numerical Investigations on the Modal Parameters of a Single-Span Steel-Frame Footbridge

Full-Scale Experimental and Numerical Investigations on the Modal Parameters of a Single-Span Steel-Frame Footbridge

Assessment of human-induced vibrations of a cable-stayed footbridge

Measured dynamic properties for FRP footbridges and their critical comparison against structures made of conventional construction materials

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