Structural Engineering and Mechanics

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Evaluating fire resistance of prestressed concrete bridge girders

  • Zhang, Gang (School of Highway, Chang'an University) ;
  • Kodur, Venkatesh (Department of Civil and Environmental Engineering, Michigan State University) ;
  • Hou, Wei (School of Highway, Chang'an University) ;
  • He, Shuanhai (School of Highway, Chang'an University)
  • Received : 2017.02.07
  • Accepted : 2017.04.07
  • Published : 2017.06.25
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Abstract

This paper presents an approach for evaluating performance of prestressed concrete (PC) bridge girders exposed to fire. A finite element based numerical model for tracing the response of fire exposed T girders is developed in ANSYS. The analysis is carried out in three stages, namely, fire temperature calculation, cross sectional temperature evaluation, and then strength, deformation and effective prestress analysis on girders exposed to elevated temperatures. The applicability of the computer program in tracing the response of PC bridge girders from the initial preloading stage to failure stage, due to combined effects of fire and structure loading, is demonstrated through a case study, and validated by test data of a scaled PC box girder under ISO834 fire condition. Results from the case study show that fire severity has a significant influence on the fire resistance of PC T girders and hydrocarbon fire is most dangerous for the girder. The prestress loss caused by elevated temperature is about 10% under hydrocarbon fire till the girder failure, which can lead to the increase in deflection of the PC girder. The rate of deflection failure criterion is suggested to determine the failure of PC T girder under fire.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Ministry of Transport of the People's Republic of China, Central Universities of China

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Cited by

  1. Performance of prestressed concrete box bridge girders under hydrocarbon fire exposure vol.23, pp.8, 2017, https://doi.org/10.1177/1369433219898102
  2. Fire Performance of Continuous Steel-Concrete Composite Bridge Girders vol.25, pp.3, 2017, https://doi.org/10.1007/s12205-021-0985-x