Computers and Concrete

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A numerical method for evaluating fire performance of prestressed concrete T bridge girders

  • Zhang, Gang (School of Highway, Chang'an University) ;
  • Kodur, Venkatesh (Department of Civil and Environmental Engineering, Michigan State University) ;
  • Song, Chaojie (School of Highway, Chang'an University) ;
  • Hou, Wei (School of Highway, Chang'an University) ;
  • He, Shuanhai (School of Highway, Chang'an University)
  • Received : 2019.07.08
  • Accepted : 2020.05.08
  • Published : 2020.06.25
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Abstract

This paper presents a numerical method for evaluating fire performance of prestressed concrete (PC) T shaped bridge girders under combined effect of structural loading and hydrocarbon fire exposure conditions. A numerical model, developed using the computer program ANSYS, is employed to investigate fire response of PC T shaped bridge girders by taking into consideration structural inherent parameters, namely; arrangement of prestressing strands with in the girder section, thickness of concrete cover over prestressing strands, effective degree of prestress and content of prestressing strands. Then, a sequential thermo-mechanical analysis is performed to predict cross sectional temperature followed by mechanical response of T shaped bridge girders. The validity of the numerical model is established by comparing temperatures, deflections and failure time generated from fire tests. Through numerical studies, it is shown that thickness of concrete cover and arrangement of prestressing strands in girder section have significant influence on the fire resistance of PC T shaped bridge girders. Increase in effective degree of prestress in strands with triangular shaped layout and content in prestressing strands can slow down the progression of deflections in PC T shaped bridge girder towards the final stages of fire exposure, to thereby preventing sudden collapse of the girder. Rate of deflection based failure criterion governs failure in PC T shaped bridge girders under most hydrocarbon fire exposure conditions. Structural inherent parameters incorporated into sectional configuration can significantly enhance fire resistance of PC bridge girders; thus mitigating fire induced collapse of these bridge girders.

Keywords

Acknowledgement

The authors wish to acknowledge the support of the National Natural Science Foundation of China under Grant Number 51878057, Research Fund for the Central Universities of China under Grant Number 300102210217, Natural Science Foundation of Shaanxi under Grant Number 2018JM5018, Science and Technology Project of Transportation Construction from Ministry of Transport of the People's Republic of China under Grant Number 2011318812970, and Michigan State University. Any opinions, findings, conclusions, or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the institutions.

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