This paper studies by numerical simulation.In the structural behaviour of steel-concrete composite highway bridge subjected to heavy vehicle fire accident we underline the influence of bridge geometrical form

fire scenario and load ratio.Using CFD simulation results of realistic fuel tanker fire scenario and hydrocarbon fire curve as thermal boundary conditions

8cases are examined in ABAQUS to reveal the internal temperature distribution of structure members under fire

concluding that skew slab bridge has higher global temperature with lower peak value than a right one under real fire;Temperature rising of real fire exhibits a similar trend as the hydrocarbon fire

with the heating speed accelerated and the peak value higher.With outputs of last step as fire load

18 cases of heating under constant load analysis are accomplished then to observe the global bridge behaviour:the failure mode of right slab bridge under fire is quite different from a skew one

the former develops large mid-span deflection accompanied with local buckling at far end support only by which the latter is featured.In the end

suggestions are made on fire design for steel-concrete composite bridge

and potential direction is pointed out for further research.