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Ambient vibration testing and modal analysis of a prestressed concrete continuous girder bridge with 9 spans

Yiyan Chen, XU You-sheng

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Abstract

An ambient vibration field-testing under traffic-induced excitation on a prestressed concrete continuous girder bridge was carried out.The bridge with 9-spans is located in Songgang County,Shenzhen,Guangdong Province.The peak picking(PP) method in frequency domain and the stochastic subspace identification(SSI) method in time domain are used for the output-only modal parameter identification.The 3-D finite element models(FEM) are constructed by using ANSYS program and a theoretical modal analysis is then performed to generate natural frequencies and mode shapes in the 3-orthogonal directions.It is further demonstrated that the results from the FEM agree well with the field tests,which can serve as a referenced model in the seismic evaluation or retrofit of the bridge.

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What this paper is about

An ambient vibration field-testing under traffic-induced excitation on a prestressed concrete continuous girder bridge was carried out.The bridge with 9-spans is located in Songgang County,Shenzhen,Guangdong Province.The peak picking(PP) method in frequency domain and the stochastic subspace identification(SSI) method in time domain are used for the output-only modal parameter identification.The 3-D finite element models(FEM) are constructed by using ANSYS program and a theoretical modal analysis is then performed to generate natural frequencies and mode shapes in the 3-orthogonal directions.It is further demonstrated that the results from the FEM agree well with the field tests,which can serve as a referenced model in the seismic evaluation or retrofit of the bridge.

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Available abstract

An ambient vibration field-testing under traffic-induced excitation on a prestressed concrete continuous girder bridge was carried out.The bridge with 9-spans is located in Songgang County,Shenzhen,Guangdong Province.The peak picking(PP) method in frequency domain and the stochastic subspace identification(SSI) method in time domain are used for the output-only modal parameter identification.The 3-D finite element models(FEM) are constructed by using ANSYS program and a theoretical modal analysis is then performed to generate natural frequencies and mode shapes in the 3-orthogonal directions.It is further demonstrated that the results from the FEM agree well with the field tests,which can serve as a referenced model in the seismic evaluation or retrofit of the bridge.

Key concepts: Structural engineering, Modal, Bridge (graph theory), Finite element method, Vibration, Modal analysis, Subspace topology, Engineering

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Ambient vibration testing and modal analysis of a prestressed concrete continuous girder bridge with 9 spans — Research Paper | ScholarLens