Experimental Research On Mechanical Behavior Of Steel And Lightweight Concrete Composite Hollow Slabs

In recent years, the steel-concrete composite structure has developed fast in our country, this structure has been used in high commercial, many storied factories for its advantages with steel and concrete. In this paper, a new type of composite slab, the steel and lightweight aggregate concrete composite hollow slab, is brought forward. This type of slab is suitable for modern city bridge and some large load industrial factories. This structure has several advantages, including small deadweight ,less consumption formwork, fast construction speed, and less cost and so on.Four pieces of composite slabs have been tested with two points symmetry loading. During the every step of load exerted, the paper recorded the strain of steel and concrete, deflection, crack, slipping at the interface and limit bearing capacity and so on. The main result of the test is given in this paper. The paper analyses the result of the test, then discuss the influence of different hole ratio on the mechanical behavior, the influence of different shear connections on the stiffness and slipping of the slabs. On the bases, the paper deduce the flexural and shear bearing capacity formulae and deformation formulae by the elastic theory, the simple plastic theory. Compared the result of test with theory, it is found that the result calculated by the simple plastic theory is in accordance with the result of the test, and the result of deflection calculated by the reduction section is less than the result of test. Then the deflection differential equation, which takes into account the slipping effect at the interface, is given. The differential equation is solved by different boundary. The deflection formula, which is deduced by this paper, is validated feasible by test.