Study Of Load-bearing Properties Of PK Prestressed Composite Slab

PK prestressed composite slab is a new composite floor structure by improving the traditional prestressed composite slab. The prefabricated component of the slab is a prestressed ribbed panel and has preparative holes on its rectangular rib. When the transverse imprestressed reinforcing steel bars through the rib's rectangle holes are collocated, a prestressed two-way composite slab is formed after the concrete cover is casted. This slab has merits of good integrity and crack resistance, high bearing capacity and low building costs, and therefore its application future is very expansive.Based on the previous study on static testing of PK prestressed composite slab, seismic performances of the slab have been researched and the shear properties are discussed in this thesis. The major researches are as follow:(1)6 full-scale models of PK prestressed composite slab component are studied under repeated vertical loading in the test. Experimental studies are carried out to investigate their seismic behaviors of the failure mechanism, hysteresis characteristic, member ductility, energy dissipation, stiffness degradation. Comparing the seismic behaviors of 6 models, we believe that PK prestressed composite slab have good seismic performances.(2) Nonlinear finite element analysis of tested components is made by the software-ANSYS. Comparing the testing results and the numerical analysis results, it is found that they are tallied well, so the feasibility and rationality of finite element analysis is verified.(3) We dicuss the shear performances under repeated vertical loading about PK prestressed composite slab member and the prestressed composite slab member with prefabricated panel. And studies show the prestressed composite slab of which the prestressed ribbed panel with preparative holes on its rectangular rib has better seismic performance than that the prestressed composite slab member with prefabricated panel. the prestressed ribbed panel and the preparative holes on its rectangular rib play important roles in improving the shear capacity of the composite component.The above research results can provide the reference when PK prestressed composite slabs are applied in the seismic area.