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摘要
The mechanical properties of shear connectors in normal service phase are the key factors affecting the deformation of steel and concrete composite structures. Aiming at the problem of insufficient research on the mechanical properties of composite dowel under the combined form of Ultra-High Performance Concrete (UHPC) and Modified Clothoide (MCL) connectors, the influence of UHPC on the shear stiffness of MCL-shaped composite dowel was studied, and the method for calculating the shear stiffness of MCL-shaped composite dowel in thin layer UHPC was explored. Push-out tests of MCL-shaped composite dowel in thin layer Normal Concrete (NC) or UHPC were designed and carried out. Refined finite element models were established by using ABAQUS software, of which the applicability and validity were verified by comparing against the test results. Based on the push-out test and finite element results, the formula for calculating the shear stiffness of the MCL-shaped composite dowel connectors in thin-layer UHPC was deduced. The results show that: 1) the shear stiffness of composite dowel connector is significantly improved in UHPC compared with that in normal concrete; 2) the shear stiffness of composite dowel connector increases with the thickness of steel dowel; 3) the proposed formula for calculating the shear stiffness of the composite dowel can accurately calculate the shear stiffness of the MCL-shaped composite dowel connector in the thin-layer UHPC. This study provides useful theoretical support for the promotion and development of UHPC composite structure with MCL-shaped composite dowel connector. ? 2023, Central South University Press.
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