Numerical simulation and simplified model of vehicle-induced bridge deck fire in the full-open environment considering wind effect
Rujin Ma, Chuanjie Cui, Minglei Ma, Airong Chen
Abstract
Bridge deck fires are a major concern in recent years because of the increasing number of relative accidents and the following serious consequences. This paper studies the process of bridge deck fire in the full-open environment by using numerical simulation method and then develops the simplified fire model with wind effects. Firstly, the essential parameters of fire scenarios simulation are determined based on previous research. Then, an existing fire experiment is simulated to verify the accuracy of FDS (Fire Dynamics Simulator) simulation program. Bridge deck fire processes with and without wind effects are simulated and the time-dependent temperature laws are obtained in FDS software. At last, a semi-empirical temperature model of bridge deck fire is established and the rationality and accuracy of the proposed model is verified. Results show that the wind effect can strongly influence the burning process of bridge deck fire. The simplified model can be adopted for heat transfer analysis of vehicle-induced bridge deck fire accidents conveniently.