Mechanical properties of (steel-reinforced) resins used in injected bolted connections
Martin Nijgh (TU Delft - Steel & Composite Structures)
Haohui Xin (TU Delft - Steel & Composite Structures)
Milan Veljkovic (TU Delft - Steel & Composite Structures)
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Abstract
This paper illustrates the most recent developments in the field of injected bolted connections. A novel injection material, steel-reinforced resin, is used to enhance stiffness of resin-injected bolted shear connections. The main goal is to achieve the slip resistance connection in a clearance holes without pre-tensioning of bolts. Steel-reinforced resins consist of spherical steel particles embedded in an epoxy resin matrix. Steel-reinforced resins are characterized by a higher Young’s Modulus compared to the bare epoxy resin. Numerical and analytical prediction methods for the quasi-static mechanical behaviour of steel-reinforced resins are presented and validated based on small-scale compression tests. The design of a tailor-made test setup, the simple pin connection, is presented. This setup allows for investigation of a generic behaviour of steel-reinforced resins subject to cyclic loading in confined conditions. Preliminary results obtained with the simple pin connection specimens are shown and improvements of the setup, specimens and process are discussed. An overview of potential applications focusing on easy and fast execution, dissembling and reuse of steel and steel/concrete structures is presented.