This paper presents an analytical method to predict the deformation characteristics of lapped connections between cold-formed steel purlins of Z sections. Based on the test results of typical lap shear tests on bolted connections between cold-formed steel sections, a normalized bearing deformation curve was established. This curve was then adopted to predict the vertical deflections of ten lapped purlins of Z sections under one point load after allowing for deformations due to global bending and shear actions. Good comparison between the measured and the predicted deformation characteristics was obtained. The proposed method provides important understanding on the structural behavior of bolted moment connections in lapped purlins, in particular, the effective flexural rigidities during the entire deformation ranges. This will greatly facilitate the product development processes of modern roof systems using cold-formed steel purlins.
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