The Mechanical Properties Of Shear Studs In Steel-RPC Structure

Reactive powder concrete is a new type of concrete, and it has the characteristics of high strength, low brittleness and high durability and good working performance, so steel-RPC concrete composite beam structure has wide application prospect in the field of bridge. As the key component of the steel and RPC concrete slab to achieve connecting and working together, the main role of Shear studs is transfering longitudinal shear force between steel girder and concrete slab and resistancing pulling force between them, but now there is little research on the mechanical properties of Shear studs in the steel-RPC concrete composite structure. Therefore, it is very necessary to study the mechanical properties of the shear studs in the steel-RPC concrete composite structure, such as the bearing capacity, the deformation capacity and so on.Based on the experimental results and theoretical model analysis, this paper presents the calculation formula of ultimate bearing capacity and the load-slippage equation of the shear studs in the steel-RPC concrete composite structure, which is mainly carried out in the following aspects:(1)Establishment of the load-slippage equation of shear studs in the steel-RPC composite structure:according to the experimental results, the shear studs are divided into several working stages, and this paper analyzes the failure modes of shear studs and its static mechanical properties such as the ultimate bearing capacity, yield load and sliding displacement etc. Based on the regression analysis method, the empirical formula of load slip of shear studs in steel-RPC composite structure is presented. At the same time, based on the theory of elastic foundation beam, the load-slip theory formula of shear studs in steel-RPC composite structure is presented.(2)Stress analysis of shear studs in steel-RPC composite structure:using a finite element software ANSYS, this paper establish the shear stud push-out tests, compare and analyse stress distribution of different length-diameter ratio of the shear studs, prove that the shear studs with length-diameter ratio less than 4 are suitable for RPC concrete.(3)Calculation of ultimate bearing capacity of Shear studs:according to the stress analysis results and relevant research results, combined with the theory of elastic foundation beam model and shear-friction theory model, the ultimate bearing force calculation method of shear stud in the steel-RPC composite structure is presented.