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This paper presents the findings of an investigation carried out to determine the mostappropriate connections, in terms of rotational stiffnes, to use for the optimum design of cold-formed Zedsection sleeve joint purlin system. Experiments and parametric studies were conducted to investigate theeffects of geometric variables on the behavior of the sleeve-purlin and cleat-purlin connections of thesleeve joint purlin system. The variables considered were purlin size and thickness, sleeve size, thickness,length and bolt position. The test results were used to verify the empirical expressions, developed herein,employed to determine the rotational stiffness of connections. With the predicted connection stiffness, themost suitable sleve-purlin and cleat-purlin connections can be selected so as to produce an optimumcondition for the sleeve joint purlin system.