Research On Mechanical Behavior Of New Composite Slabs Under Vertical Uniform Load

Along with the theories and the experimental study of composite steel-concrete beams being perfect gradually. The development of composite construction is displayed on new construction form coming forth. Such as, Composite steel-concrete beams with concrete flange made up of efficient prestressed concrete laminated slabs, is a new type of construction form. However, the study on the interaction working behavior about the whole composite slabs is very little, the design about it still has some shortage. Considering the shortage existed in the design, we have finished a experimental research about two models of this type of composite slabs. After it, we studied the interaction working behavior, deformation behavior, flexural capacity of composite steel-concrete beams, and the deformation behavior of continuous laminated slabs. The main research has been done as follow:The first part of the paper primarily introduces the design and making of the experimental models, the disposal of straingauges and displacement gauge on composite beams and laminated slabs, the methods and steps of adding loads.The second part of the paper primarily analyses the mechanical behavior of the interface of prestressed concrete laminated slabs, and introduces the disposal methods about the slab-side gaps of efficient prestressed laminated slabs. This part mainly analyses the interaction working behavior of composite steel-concrete beams under different load, and obtains the distributing regulation of opposite slip at the interface of steel beams and concrete slabs.The third part firstly introduces the rules about how to confirm the valid width of concrete flanges in composite steel-concrete beams, and then founded the deflection formulae of composite steel-concrete beams by "transformed section method" and "reduction rigidity method". By comparing and analyzing the measured results and the predicting deflection according to this two formulae, puts forward the suggestion about the value of the valid width of concrete flanges in composite steel-concrete beams.The forth part mainly analyses the flexural capacity of composite steel-concrete beams, and the influence of the slip on the interface of steel beam and concrete flange to the flexural capacity.The last part analyses the deformation behavior of prestressed continuous laminated slabs, and founded the deflection formula of continuus laminated slabs in the span. At last it analyses the influence of the inverted arch on prestressed concrete laminated slabs to the deformation.