Development And Mechanical Performance Research Of New Hollow Composite Slabs

Profiled steel plate-concrete composite slabs refer to a mechanical member that uses some structural measures to combine profiled steel plate and concrete with two different properties into a whole so that they can work together.Profiled steel plate-concrete composite slabs are widely used in building structures due to its fast construction speed and its ability to make full use of the respective material properties of concrete and steel.In recent years,with the development of new buildings towards long-span,high-rise and super-high-rise buildings,the traditional profiled steel plate-concrete composite slabs are applied to long-span structures.Due to its large dead weight,it is difficult to meet the requirements of safety,economy and durability.Therefore,the development of a new type of composite slabs with good overall performance,light weight,low cost,meeting the use requirements and convenient assembly construction has become an urgent problem to be solved in the field of construction engineering.Based on the research on the existing structural forms of profiled steel plate-concrete composite slabs by relevant scholars,this paper proposes a new type of assembled integral profiled steel plate-concrete hollow composite slabs,which solves the problems of large dead weight of the existing large-span beam-slab structure floor.On the basis of this new composite floor,ABAQUS finite element model is established,and its flexural bearing capacity is studied by numerical simulation.The influence of different parameters such as profiled steel plate thickness,composite slabs height and shear span ratio on the ultimate bearing capacity of open new hollow composite slabs and closed new hollow composite slabs under different spans is analyzed.The results show that: Both small-span and large-span open-type hollow composite slabs have longitudinal shear failure under load,while both small-span and large-span closed-type hollow composite slabs have bending failure under load.At the same time,the ultimate bearing capacity of closed-type profiled steel plates is much greater than that of open-type profiled steel plates.The main factors affecting the bearing capacity of the new hollow composite slabs include the thickness of profiled steel plate,the height of composite slabs and the shear span ratio.By analyzing the influence of various parameters on the ultimate bearing capacity of new hollow composite slabs with different spans and different slab types,it can be concluded that increasing the thickness of profiled steel plates can improve the ultimate bearing capacity of new hollow composite slabs,and the influence of the thickness change of profiled steel plates on the ultimate bearing capacity of long-span slabs is more obvious,but increasing the thickness of profiled steel plate increases the end slip of the new hollow composite slabs under ultimate load.Increasing the height of the hollow composite slabs can improve the ultimate bearing capacity of the new hollow composite slabs,and the end slip of the corresponding composite slabs decreases under the ultimate load.The shear span ratio has the most significant influence on the new hollow composite slabs.With the increase of shear span length,the bearing capacity,stiffness and end slip of the members decrease,but the better the overall performance,the failure mode of hollow composite slabs tends to be bending failure.