LAUSR

Abstract With the rapid development of the offshore wind power industry, large-diameter grouted connections (GCs) with high-strength grout have become a developing trend. Previous studies on ordinary-strength and small-scale GCs may not meet current engineering needs. A numerical study was carried out to investigate how the axial mechanical properties of a large-diameter GC that has high-strength grout are influenced by geometric parameters, such as radial stiffness, the height to space ratio (h/s) of shear keys, and the length to diameter ratio (Lg/Dp). The finite element model was verified against the results of the experimental test. The mechanical properties of ultimate bearing capacity, interface transfer strength, ductility, nominal average stress and grout contact pressure distribution are discussed in detail. The results suggest that the increase in radial stiffness can strengthen the axial ultimate bearing capacity and ductility of the GC. Besides, the h/s of the shear keys can affect the ultimate bearing capacity and ductility of GC by influencing the number of diagonal compression struts. Although the Lg/Dp can significantly improve the axial ultimate bearing capacity of GCs, conversely, the interface transfer strength is continuously reduced. The research results can provide technical reference for the design of GCs in the offshore wind turbine industry.