Numerical exploration of a high strength and durability non-projected and sandglass-shaped bolt for steel structures’ connection

Abstract

This paper investigated the influences of various structural configurations like the grip length and drilled hole shape on the stress concentrations of a non-projected and sandglass-shaped bolt comprising a countersunk head bolt and countersunk sleeve nut, which can secure a constant coating thickness and prevent corrosion. Moreover, one appropriate combination of structural configurations was explored with FEA. Obtained numerical results revealed that the nut’s drilled hole shape should be penetrating to mitigate the stress concentrations on the thread parts and fillets.