Experiment Study And Analysis Of PK Prestressed Continuous Composite Slab

PK prestressed composite slab, which is composed of precast ribbed prestressed component and superimposed concrete, is a new composite floor structure. The slab not only has good performances on bearing capacity, integrity and crack-resistance, but also has many advantages in the construction,such as low building costs and convenient.Therefore the application of the slab is very expansive in the future.Many researches have been done on PK prestressed composite slab by our research group this years, and fruitful research results are acquired. But the performances of the PK prestressed continuous composite slab has not been well understood.So,this thesis is going to carry on experiment study and analysis on the PK prestressed continuous composite slab. The major researches are as follow:(1) Symmetry and uniformly distributed load tests are conducted on three PK prestressed continuous composite slabs,whose reinforcements of the intermediate support are different. Based on the tests,the cracking load and bearing capacity are acquired.And the theoretical analysis are conducted on the continuous composite slab, then the theoretical results are contrasted with the results of the experiment study.(2) Based on observing the crack expansion and internal forces transformation, the plastic internal forces redistribution properties are analysed. The internal forces redistribution of the PK prestressed continuous composite slab is caused by cracking, and the internal forces of the continuous composite slab are redistributed with the expansion of the crack and the appearance of the plastic hinge.(3)Based the analysis and contrast on the deflection and crack-resistance of the three PK prestressed continuous composite slabs, the maximum moment adjusting range of the PK prestressed continuous composite slabs is provided, and the range had better to be less than twenty percent.(4)Finite element analysis are conducted on the three PK prestressed continuous composite slabs,and contrast with the results of the theory and experiment study. The rationality of the theory study is verified.