A method for the direct identification of vibration parameters from the free response

Identification of modal parameters from ambient vibration data by modified eigensystem realization algorithm

Long-span bridges are always a multi-support structural system, and seismic ground motion can vary significantly over distances comparable to the length of such kind of bridges, so it’s difficult to carry out shaking table tests because of the restriction of the dimension and amount of shaking tables. This paper discusses the multiple sub-table cordwood system is used to conduct a study on the seismic testing of a three-span irregular Concrete filled steel tubular (CFST) arch bridge with the objective of investigating the dynamic performance of the bridge under spatial earthquake motions. The development and testing of the bridge model and selected experimental results are discussed then. The seismic response and response characteristics of acceleration, displacement, internal force, and strain of the structure under earthquake excitations are gained, which can provide test data and basis to evaluate the seismic performance of this CFST arch bridge or other similar structural system design.

Seismic Testing of a Long-Span Concrete Filled Steel Tubular Arch Bridge

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Dynamic testing and model updating of an eleven-span concrete motorway bridge

An Overview of Operational Modal Analysis

The covariance-driven continuous wavelet transform incorporated with singular value decomposition is proposed in the paper to identify the operational modal parameters of structures. The covariance of operational measurements is converted into the time-scale domain using a continuous wavelet transform. Then, by performing singular value decomposition (SVD) on the covariance matrix of multi-measurements, the ridges of the covariance wavelet coefficient are decomposed. The obtained wavelet ridges of the covariance wavelet coefficient that represent the structural modal features are used to estimate the operational natural frequencies and damping ratios. The ratio of cross-covariance wavelet coefficients to auto-covariance wavelet coefficients is proposed to estimate mode shapes. A numerically simulated frame structure and a full-size bridge tested in the field under operational conditions are studied to verify the proposed technique and to demonstrate its accuracy. It has been shown that the proposed techni...

A method for the direct identification of vibration parameters from the free response

Citations

Identification of modal parameters from ambient vibration data by modified eigensystem realization algorithm

Seismic Testing of a Long-Span Concrete Filled Steel Tubular Arch Bridge

Dynamic testing and model updating of an eleven-span concrete motorway bridge

An Overview of Operational Modal Analysis

Operational Modal Parameter Identification Based on Covariance-Driven Continuous Wavelet Transform and Singular Value Decomposition:

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