Improved Continuum Model for Free Vibration Analysis of Suspension Bridges

Gwon, Sun-Gil; Choi, Dongho

doi:10.1061/(asce)em.1943-7889.0001244

Cited by 9 publications

(3 citation statements)

References 36 publications

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“…In addition, the application of optimal IM is also the key link to ensure the reliability of the seismic vulnerability assessment. (3) e component-level fragility curves are calculated using equation (2). For the purpose of reducing the various damage potential of critical bridge components in the initial design, different seismic designs are proposed based on earthquake damage experiences, related component seismic experiments, and expert opinions.…”

Section: Procedures Descriptionmentioning

confidence: 99%

“…In the past studies related to suspension bridges, researchers were mainly concerned about the vibrational characteristics and dynamic analysis of suspension bridges involving the use of the finite element method [1] and continuum approach [2], which were the bases of the seismic analysis. Although the performance-based seismic evaluation framework has been widely applied to structural engineering and conventional highway bridges, only a small number of studies have investigated the seismic performance of suspension bridges by employing the performance-based evaluation methods.…”

Section: Introductionmentioning

confidence: 99%

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Fragility‐Based Improvement of System Seismic Performance for Long‐Span Suspension Bridges

Wang

Qiu

2020

Advances in Civil Engineering

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In this study, a procedure is developed to evaluate and improve the seismic performance of long-span suspension bridges based on the performance objectives under the fragility function framework. A common type of suspension bridge in China was utilized in the proposed procedure, considering its approach structures according to earthquake damage experience and fortification criteria. Component-level fragility curves were derived by probabilistic seismic demand models (PSDMs) using a set of nonlinear time-history analyses that incorporated the related uncertainties such as earthquake motions and structural properties. In addition, one step that was covered was to pinpoint the capacity limit states of critical components including bearings, pylons, and columns. The stepwise improved seismic designs were proposed in terms of the component fragility results of the as-built design. Results of the comparison of improved designs showed that the retrofit measure of the suspension span should be selected based on two attributes, i.e., displacement and force, and the restraint system of the approach bridges was a key factor affecting the reasonable damage sequence. Necessarily, from the comparison of different system vulnerability models, the mean values of earthquake intensity of system-level fragility function developed by the composite damage state indices were used to assess the overall seismic performance of the suspension bridge. The results showed that compared to the absolutely serial and serial-parallel assumptions, the defined composite damage indices incorporating the thought of component classification and structural relative importance between the main bridge and approach structures were necessary and were able to derive a good indicator of seismic performance assessment, hence validating the point that the different damage states were dominated by the seismic demands of different structures for the retrofitted bridges.

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Section: Procedures Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fragility‐Based Improvement of System Seismic Performance for Long‐Span Suspension Bridges

Wang

Qiu

2020

Advances in Civil Engineering

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“…The modal information can be easily investigated by this model [1][2][3][4]. More recently, Gwon and Choi [5][6][7] conducted a series of studies with the continuum model of a three-span suspension bridge with special focuses on the effects of hanger extensibility, boundary conditions of the girder and the configuration of the main cables.…”

Section: Introductionmentioning

confidence: 99%

Innovative approach with harmonic modes and finite element modeling for the nonlinear dynamic analysis of a suspension bridge

et al. 2022

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The non-linear characteristics of a general multiple degrees-of-freedom suspension bridge under harmonic excitation are studied with an innovative approach consisting of the harmonic modes, the finite element modeling and the Incremental Harmonic Balance method. The geometric non-linearity induced by large amplitude vibration is considered. The harmonic mode and mean kinetic energy of the system are proposed to describe the non-linear responses. The harmonic mode can be expressed as a linear combination of different linearized system modes. The resonance responses of the structure are characterized with the participation ratio of these system modes. Its composition under harmonic excitations can easily be described in terms of the different harmonic mode shapes and then the system modes. The proposed method is further applied to analyze, in detail, the properties of the harmonic modes and the evolution of the steady state non-linear responses with variations in the excitation frequency.

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Multimodal vibration suppression of nonlinear Euler–Bernoulli beam by multiple time-delayed vibration absorbers

Meng

Sun

et al. 2021

Meccanica

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Improved Continuum Model for Free Vibration Analysis of Suspension Bridges

Cited by 9 publications

References 36 publications

Fragility‐Based Improvement of System Seismic Performance for Long‐Span Suspension Bridges

Fragility‐Based Improvement of System Seismic Performance for Long‐Span Suspension Bridges

Innovative approach with harmonic modes and finite element modeling for the nonlinear dynamic analysis of a suspension bridge

Multimodal vibration suppression of nonlinear Euler–Bernoulli beam by multiple time-delayed vibration absorbers

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