Performance And Design Of Prestressed Concrete Hollow Composite Board Of The Force Calculation

A new style of composite slab called WFB prestressed concrete hollow-core floor is researched in this paper. The WFB prestressed concrete hollow-core precast slab is made in the factory, then the cast-in-place concrete is poured into flute between the precast slabs, which forms an assembled monolithic floor. The highintention spiral ribbed bar is used for tendon, the height of section of the precast slab is equal to the final designed height of the composite slab, so that the precast slab has higher ultimate carrying capability and higher rigidity, which makes the precast slabs don't need any interim braces to be supported in the mid-span in the construction. WFB prestressed concrete hollow-core composite slab has much excellence of the precast assembled floor and the in-place floor, it can not only speed up construction,save formwork,reduce the cost and so on, but aslo can reduce the deadweight of floor, enhance crack resistance. It is especially suitable for steel structural house, and produce great comprehensive benefit compared with general cast-in-site floor.Based on the existing theories and experimental research of overlapping flexural members in the country and abroad, the author deduced the right formulas of cracking moment and ultimate bearing capacity of WFB prestressed concrete hollow-core composite slab, research the the formulas of stiffness,and analysis the crack resistance and shear resistance according to the section types and mechanical behavior.Changing the parameters of WFB hollow-core precast slab, fifteen finite element models of WFB hollow-core precast slab has stabled to reseach the main influencing factors of the cracking moment and ductility.At last, based on the analysis of the process of design calculation of WFB prestressed concrete hollow-core composite slab as one way slab(simply support slab in first phase, continuous slab in second phase), design tables of the usual span WFB prestressed concrete hollow-core composite slab is completed.which is list in order to easily choose in the project design.