Study On Influence Of Floor Deck Slab On Bearing Capacity Of Steel Reinforced Concrete Structures

Floor support slab is widely used in the steel structure because it can adapt to the rapid construction requirements and provide a convenient working platform in a short time.The floor support slab not only can save much work on the formwork,but also reduces the use of steel and concrete.And thus the slab is integrated with the concrete which can express the excellent composite properties,which unite tensile properties of the steel and the compress properties of the concrete.It is very important for high-rise buildings,especially in seismic zones.Although there are some engineering specifications which can be used for the slab design,there is no systematic research conclusion.In particular,there is no quantitative conclusion on the impact resistance of composite slabs.Therefore,this paper focuses on the influence of the floor support slab on the bearing capacity of the steel reinforced concrete structure.Based on this research,we can obtain the influence law of the floor slab on the impact resistance of the composite slab and the selection criteria of the slab steel slab.This research will be studied by numerical method.Firstly,the static analysis of the same material flat steel plate is carried out under the same working condition.The comparison studies are carried out between the mechanical properties of the floor slab and the flat steel plate.Secondly,the various factors of the floor slab on the bearing capacity are analyzed,including the thickness of the floor support slab,width,the moment of inertia,the span of the steel structure,the spacing of the secondary beam of the steel structure,the number of fixed points of the floor slab and the steel structure,etc.The influence law of the above parameters influence is obtained.Furthermore,the sensitive factors can be selected based on these studies.Finally,some impact properties of the free fall on the single-story steel-concrete composite slab are simulated.The influence of the floor slab on the impact resistance of the steel reinforced concrete structure is obtained.This researches can provide some engineering reference for the use of the floor slab in steel reinforced concrete structure according to the practical and economic principle.This research shows that the bearing capacity of the floor support slab is more excellent than the flat steel plate.Among these factors,the secondary beam spacing is the most sensitive factor for the bearing capacity of the floor slab the steel structure.And then,the effective coverage width and thickness of the floor slab are the second sensitive factors.The span of the steel structure has little influence on the bearing capacity of the floor slab.In numerical cases,the number of fixed points of the floor has some slight affection on the bearing capacity after determining the constraints between the slab and the main beam.It is significant that the impact resistance of the steel reinforced concrete structure affected by the floor slab.The use of laying the floor slab will greatly improve the impact properties of the steel reinforced concrete structure.