Study On Mechanical Property Of Notch-stud Connectors For Timber-Concrete Composite Beams

The timber-concrete composite structures is a new type of structure on the basis of the wood structure and concrete structure, which formed by combing a timber beam and an upper concrete flange using different types of connectors. The timber-concrete composite beam makes good use of the optimal performance of the two materials:timber in tension and concrete in compression. Compared with the traditional timber beam, the bending and stiffness of the composite beam is proved. The composite structure of low energy consumption, less emissions, light quality, has been widely used in Europe and America countries.In recent years, the composite structures are very popular in European and American countries and it become one of the leading edge and hot spot in this field.In composite structure, the shear connectors in the interface of different materials are important factors affecting the effects of connection. And the structure efficiency of a TCC highly depends on the stiffness of the interlayer connection. So the design of shear connector is an important part of design of composite beams. In order to study the mechanical behavior of shear connectors, in this paper, the push-out specimens with notch-stud connectors were tested. By designing different length, depth, width of notch and the diameter of the stud, the parameters of coach is studied. At the same time, notch without stud and connectors with a stud were also compared. In the test, there were 10 group of 30 notch-stud connectors with static load experiment, and discusses the destruction mode and the mechanical performance of the notch-stud connectors, and also analyzed the main factors of the shear bearing capacity of the notch-stud connectors. The results of the test show that for notch-stud shear connector, the shear bearing capacity increases along with the length and width of the notch and diameter increasing of the stud, and the influence is obvious; With the increase of the depth of the notch, the shear bearing capacity of the notch-stud connectors slower changed, and the effect is not obvious, and the relative slippage of wood and concrete had little difference; In the case of presence of stud, the data was bigger than the shear bearing capacity of notch connector without stud. And according to the test results, the notch-stud shear bearing capacity calculation formulation was provided. It can provide a basis for the design of timber-concrete composite structure and for the engineering application.Furthermore, the finite element software ABAQUS has been used to simulate the push-out specimens. A quarter finite element model of simulation test was established, draw the bearing capacity of the notch-stud shear connectors, and extract the relative slip of wood and concrete. Finally, the finite element analysis results and test data are compared, and the result of finite element calculation are shown to be in good agreement with the result of experimental.