Structural performance of bolted overlap connection in multi-span cold-formed steel Z-purlin

Document Type

Conference Proceeding

Publication Date

10-2023

Abstract

Recently, the use of Cold-Formed Steel (CFS) sections in construction has observed a significant surge. The connections of CFS buildings, in many instances, dictate their behaviour. This research aims to investigate the structural performance of overlap connections in multi-span CFS Z-purlin under monotonic loading. An overlap bolted connection is proposed for a multi-span continuous purlin system to achieve economic benefits while ensuring shear and moment transmission without pre-mature connection failure. The effects of overlap length and bolt arrangement were investigated in terms of flexural capacity and stiffness. Three specimens were experimentally tested, in which purlins made up of CFS Z-sections and high strength bolts (HSB) with a diameter of 12 mm and grade 8.8 were used. The test setup consisted of two-span back-to-back CFS Z-specimens connected using an overlap connection, with a point load applied at each span. The setup was designed with lateral supports to prevent lateral torsional buckling. The experimental results revealed that increasing the overlap length improved the flexural behaviour of the specimens. Moreover, the bolt arrangement was crucial to enhancing both the strength and stiffness of the lapped connections.

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