Mechanical Modelling of the Strength and Stiffness of Circular Hollow Section Tube under Localised Transverse Compression and Tension

Abstract

The component method is a powerful tool for designing and modelling steel beam-to-column connections. Its widespread use is ensured by several formulations currently included in Eurocode 3 part 1.8 for welded and bolted joints. However, the recent use of 3D Laser Cutting Technology (3D-LCT) in the construction market has enlarged the range of solutions, allowing the realisation of tubular columns with passing-through elements. Given the recent development, no design formulations are currently provided for this typology. At this moment, only a few research studies have developed to fill this knowledge gap. At the University of Salerno, since some years, research efforts are ongoing to characterise the flexural strength of connections between Circular Hollow Section columns and passing double-tee beams, suggesting methodologies to predict the behaviour of the resistance and stiffness of this typology and some of its elementary joint components. Within this framework, this paper aims to examine the strength and stiffness of one of the main components of this joint, which was never examined previously, that is the so-called tube under localised transverse tension/compression. Design formulations are derived from a parametric study carried out through numerical simulations of several geometric configurations.

Cyclic behaviour of 3D cut welded connections with CHS columns and through I‐beams

“…Instead, the components pct and pcc have been modelled employing the hysteretic model, whose parameters are assessed thanks to Eqs. (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12). This numerical model has been validated against the 30 cyclic FE analyses on CHS to through-all double-tee beam connections presented in previous section.…”

“…With the same approach, the components ttc/ttt have been characterised by Latour et al [12]. In this case, the response of these components is with a simple elasticplastic law, whose strength and stiffness are defined according to these formulations:…”

“…Within this framework, this paper is focused on studying the cyclic behaviour exhibited by the analysed connection once all the nodal components have been characterised [10][11][12].…”

“…Nevertheless, even though these equations reliably predict the flexural strength and initial stiffness of the studied connection, they do not let to identify the local behaviour of the single nodal components in which the connection can be simplistically divided. For this reason, the second step of the activity has been based on investigating the single components of the joint [10][11][12] to assemble them to predict the monotonic and cyclic behaviour of the whole connection.…”

“…through-all I-beam connections [8][9][10][11][12]. The first step of the investigation consisted in performing experimental tests and numerical simulations on beam-to-column subassemblies, which allowed proposing formulations to predict the flexural strength and initial stiffness of the analysed joint [8][9].…”