| A new patent called WFB assembled monolithic 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 high intention 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 assembled monolithic prestressed concrete hollow-core floor 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, and create favorable condition for using high-strength concrete.We carry out the experiment of WFB prestressed concrete hollow-core precast slabs and composite slabs, analysis their capability of bearing the load. The experimental research indicates that WFB prestressed concrete hollow-core precast slabs and composite slabs have higher ultimate carrying capability and better crack resistance, the test slabs don't cracked under the normal load, the displacement can satisfy the requirement of the code under normal condition; the ultimate carrying capability, crack and displacement of the slabs can be calculated according to the correlative formula of code for design of concrete structures(GB50010-2002). According to the experiment of two-span WFB prestressed concrete hollow-core composite continuous slabs, the capability of bearing the load is researched, which indicate that we can calculate the ultimate load according to the theory of plasticity; we also analysis the redistribution feature of moment of flexure and suggest that the moment coefficients of the maximal plus moment and the minimum minus moment of WFB prestressed concrete hollow-core composite continuous slabs are 0.1 and-0.08.In this paper, in the light of the experiment on a WFB assembled monolithic prestressed concrete hollow-core floor slab under static water and finite element analysis, its working performances are studied and analyzed. The experimental result indicates that working characters of the test floor slab is typically two-way obviously and has excellent bulking property under normal using load; the displacement of the test floor slab can be calculated by the theory of elastic thin plank, the elastic bending rigidity in orthogonal direction of the test floor slab is researched. According to the theory of finite element analysis and ANSYS programme, the finite element model of the WFB assembled monolithic prestressed concrete hollow-core floor slab is established, the result of finite element calculation indicates that the finite element model can simulate the actuality of the test floor slab well, the result of calculation is closely meet the test. |
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