Analysis of a heavy goods vehicle fire in wind conditions and its impact on structural performance of a cable-stayed bridge

摘要

With growing concern over the fire risk of bridges, an analysis of temperature fields of heavyrngoods vehicle (HGV) and the impacts on bridge structure was conducted, by taking a cable-stayedrnbridge as a research object. With the test data of HGV fire in the Runehamar tunnel in Norway, thernHGV fire model was obtained with numerical simulation. Using this model, the flame temperaturesrnof HGV fire on the bridge deck were acquired at wind velocities of 0 m/s, 2.5 m/s and 5 m/srnrespectively. Considering the heat transfer characteristics of fire, the temperatures of stay cablesrnwere also achieved, and then the failures of stay cables were studied. After that, the safetyrnassessment of bridge was conducted. The results show that the wind could reduce the damage ofrnstay cables caused by fire. And the HGV fire has limited influence on the overall safetyrnperformance of bridge, but will pose a serious threat to the reliability and durability of bridge. Sornit’s necessary to take effective measures to reduce the loss caused by fire.