This paper provides new guidance on the use of unstressed grouted sleeves in strengthening/ modification/ repair (SMR) applications. Presently there is no guidance for the slip capacity of grouted split sleeves having longitudinal bolted flanges, and the available guidance for continuous sleeves (as used in pile-sleeve connections) requires modification to make it applicable for split sleeves. The investigations detailed herein encompass the effects of both axial loading sense (tension or compression) and connection details (weld beaded or plain pipe). It is necessary, when examining the slip capacity of grouted components, to use test data. A database of continuous and split sleeve test results was therefore compiled, verified and subjected to screening procedures. Available codified provisions for pile-sleeve connections have been checked against the database, and shortcomings have been exposed for extension to SMR applications. The screened database was then interrogated further and enhanced guidance provisions were derived to address the shortcomings, in particular for split sleeve pipe connections. The results confirm that the latest existing guidance for slip capacity of pile/sleeve connections is suitable for such components with a caveat on plain pipe connections under tension loading. For continuous grouted sleeves in SMR situations, the same guidance can be used. For split sleeves, the reduced hoop stiffness due to the presence of longitudinal bolted flanges usually leads to lower slip capacities than equivalent continuous sleeve specimens. New guidance is presented in this paper to cover such connections.
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