Research On The Interfacial Shear Resistance Of The Composite Deck System Composed Of Orthotropic Deck And Ultra-thin RPC Layer

Compared with the steel bridge deck paved with conventional asphalt concrete,Composite Deck System composed of steel deck and RPC Layer has a higher localstiffness and better fatigue performance.Compared with the steel bridge deck pavedwith conventional asphalt concrete, Composite Deck System composed of steel deckand RPC Layer has a higher local stiffness and better fatigue performance. Shearconnector is the key component to ensure that the steel box girder and the concretebridge deck work together, its main function is to transfer the interfacial shearingforce and to resist the lifting force between steel beam and concrete deck. Because theRPC layer is very thin, the shear connector is abnormal.In this paper,it research onthat two new type shear connector which called the ultrashort stud and the steelmesh.general content is as follows:This paper review of the current situation of application and the variousproblems about traditional steel bridge deck and pavement.By compared of theMaterial properties of reactive powder concrete (RPC) and ordinary concrete，introducing the concept of steel-thin RPC layer combinational deck.Then, It focuseson steel-thin RPC layer combinational deck’s shear capacity,classification oftraditional shear connectors, main theories and methods of analysis about calculatingshear capacity.(2)From the normal formula, combining with ANSYS finite elementprogram,researching on the mechanical property,load-slip curve and actual ultimateshear capacity of steel-RPC combinatorial structures of short cylinder head studs. Theresult show that the single studs’ ultimate bearing capacity raise42%when itcompares with the push-out sample which is poured by common concrete.At last,carrying out a push-out experiment, measue the stud’s load-slip curve and then getthe ultimate bearing capacity formula of the stud.(3)By analyzing steel mesh shear connector push-out test model in steel-RPCcomposite bridge deck structure, conclude new steel mesh shear connector mechanicalbehavior and failure mechanism. In additional, we get shear capacity of differentparameters by comparing finite element models of steel mesh push-out test indifferent reinforcement diameter、bar arrangement and concrete strength. At last,concluding that the steel mesh connector has better stiffness and shear capacity than short stud by comparing load-displacement curve and short stud push-out test inchapter2.(4)we will carry on field test to further verify the accuracy of finite elementmodel of steel mesh push-out test, and will compare the practical load-displacementcurve and theoretical load-displacement curve to verify the accuracy of the analysisin the previous chapter.In additional, steel mesh shear connector has betterperformance than short stud connector is tested,and commonly used size of steel meshconnector is3times better than short studs’(5)It is uncommon to use the research method from steel mesh shear for previousbridge deck steel mesh structure is mainly used for bending resistance,so there is nospecific shear theory calculation formula.On the basic of commonly used size steelmesh connector shear capacity concluded in the first two chapters, taking theGuangDong FoChen bridge for example, providing a set of steel mesh arrangementmethod to use steel mesh shear capacity and laying the foundation for future project.The above study for the new type of shear connectors provides a theoretical basisand reference in composite structure of steel-RPC applications, and has broadapplication prospects.