Advanced Steel Construction

Vol. 11, No. 3, pp. 372-382 (2015)


RESIDUAL LIFE EVALUATION OF PRESTRESSED REINFORCED CONCRETE HIGHWAY BRIDGES UNDER COUPLED CORROSION-FATIGUE ACTIONS

 

Jin-song Zhu1,2,*, Fa-min Huang1, Tong Guo3 and Yun-he Song1
1 School of Civil Engineering, Tianjin University, Tianjin, China.
2 Key Laboratory of Coast Civil Structure Safety (Tianjin University), Ministry of Education, Tianjin, China.
3 School of Civil Engineering, Southeast University, Nanjing, China
*(Corresponding author: E-mail:
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DOI : 10.18057/IJASC.2015.11.3.10

 

ABSTRACT:

To evaluate the residual life of prestressed reinforced concrete (PSC) highway bridges in coastal environment, the residual life analysis method of PSC highway bridges under coupled corrosion-fatigue effects is proposed. The multi-scale finite element model of the bridge is employed to perform the detailed stress analysis. The vehicle-bridge coupling vibration analysis is performed to obtain the stress impact coefficients and stress histories of key prestressing strands under the standard AASHTO fatigue truck model. A pit corrosion model is adopted to get stress concentration factors of prestressing strands induced by corrosion. A comprehensive analysis approach is proposed to determine stress amplitudes of key prestressing strands under coupled corrosion-fatigue actions. The S-N curve and the traffic conditions are integrated to determine the service life of the weakest prestressing strand, which is characterized as the service life of the bridge. The effectiveness of the methodology framework is demonstrated on a large-span continuous PSC box-girder bridge.

 

Keywords:Prestressed reinforced concrete bridges, Coupled corrosion-fatigue actions, Residual life, Multi-scale finite element model

 

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