Effect of Bolt Pre-loading on the Rotational Stiffness of Bolted Connections.

Abstract

This study explores the influence of bolt preloading on the rotational stiffness of stainless-steel end-plate connections, specifically focusing on extended end-plate connections with six bolts. In this work, a validated numerical model was used to investigate the impact of varying levels of bolt preloading on rotational stiffness. A snug tight connection serves as the baseline for comparison. The investigation reveals how bolt preload affects the rotational behaviour of the connection. The validated numerical model provides a comprehensive understanding of the relationship between bolt preloading and rotational stiffness in stainless steel end-plate connections. For example, it is shown that the rotational stiffness increases by 134% with ultimate preloading. This research contributes to advancing the knowledge base in structural engineering by clarifying the effect of connection element geometric properties on rotational stiffness. The findings not only improve understanding of rotational behaviour but also can help optimise the design and performance of stainless-steel end-plate connections in various structural applications.