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Steel and Composite Structures
  Volume 38, Number 6, March25 2021, pages 657-670
DOI: https://doi.org/10.12989/scs.2021.38.6.657
 


Designing method for fire safety of steel box bridge girders
Xuyang Li, Gang Zhang, Venkatesh Kodur, Shuanhai He and Qiao Huang

 
Abstract
    This paper presents a designing method for enhancing fire resistance of steel box bridge girders (closed steel box bridge girder supporting a thin concrete slab) through taking into account such parameters namely; fire severity, type of longitudinal stiffeners (I, L, and T shaped), and number of longitudinal stiffeners. A validated 3-D finite element model, developed through the computer program ANSYS, is utilized to go over the fire response of a typical steel box bridge girder using the transient thermo-structural analysis method. Results from the numerical analysis show that fire severity and type of longitudinal stiffeners welded on bottom flange have significant influence on fire resistance of steel box bridge girders. T shaped longitudinal stiffeners applied on bottom flange can highly prevent collapse of steel box bridge girders towards the end of fire exposure. Increase of longitudinal stiffeners on bottom flange and web can slightly enhance fire resistance of steel box bridge girders. Rate of deflection-based criterion can be reliable to evaluate fire resistance of steel box bridge girders in most fire exposure cases. Thus, T shaped longitudinal stiffeners on bottom flange incorporated into bridge fire-resistance design can significantly enhance fire resistance of steel box bridge girders.
 
Key Words
    steel box bridge girders; bridge fires; finite element model; fire performance; fire-resistance design
 
Address
Xuyang Li, Gang Zhang and Shuanhai He: School of Highway, Chang'an University, Xi'an, Shaanxi 710064, China
Venkatesh Kodur: Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48864, USA
Qiao Huang: School of Transportation, Southeast University, Nanjing, Jiangsu 210096, China
 

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