Steel deck-concrete composite slab is composed of concrete and steel deck

with its advantages

such as convenient construction

force reasonableness

and full use of material properties etc.In order to study the bearing mechanism and failure mode of steel deck concrete composite slabs under fire

the experimental study on two steel deck concrete composite slabs under fire is made

through adopting the IOS-834 standard heating up curve

to investigate the crack development and distribution of composite slabs at the top and bottom of the board.The failure mode of composite slabs under fire is revealed.The curve of deflection-time and the curve of temperature-time at different locations within the composite slabs are given in this paper.The tensioned membrane effect force is proved to be the final bearing force of the slab system under fire through contrastive analysis of test result.