Influence of shear lag coefficienton circular hollow sections with bolted sleeve connections

Lucas Roquete,Ana Amélia Oliveira Mazon,Arlene Maria Cunha Sarmanho,João Alberto Venegas Requena

doi:10.1590/0370-44672014700220

Abstract

Abstract The circular hollow sections (CHS) are being widely employed in steel structures around the world, increasing the development of new researches. This article proposes an innovative connection model for circular hollow sections that facilitates and reduces the assembly cost of hollow section structures. The proposed connection is a tube sleeve, used to splice two tubes, composed of an inner tube with a diameter smaller than the connecting tubes, which is connected to the outer tubes by bolts passing through both tubes. This connection can be a cheaper and easier alternative to flange connections, which are widely used in large span tubular trusses. The connection was tested in laboratory under tension loading. The tests made it possible to identify the influence of stress distribution on tubes and the need for the use of a shear lag coefficient. The results of the ultimate load capacity demonstrated the viability of the tube sleeve connection use.

Highlights

Steel tubular structural sections allow a higher load capacity for axial force, and torsion as well as for combined effects
From the tubular sections with flange studied by McGuire (1968), shown in Figure 1(a), the continuity of the profile is by a sleeve connection, which presents a much more elegant appearance and allows the use of standardized elements, as shown in Figure 1 (b)
It was possible to observe that the load capacity of through the effective net area (Table 2). these prototypes was above the theoretical The theoretical values of group A use the yielding gross section and the fracture shear lag coefficient Ct equal 1.0

Summary

Introduction

Steel tubular structural sections allow a higher load capacity for axial force, and torsion as well as for combined effects. Recommendations for the use of circular hollow sections are generally based on CIDECT (2008). This article deals with steel CHS submitted to tensile force with bolted connections. From the tubular sections with flange studied by McGuire (1968), shown, the continuity of the profile is by a sleeve connection, which presents a much more elegant appearance and allows the use of standardized elements, as shown in Figure 1 (b). This new type of connection has been studied by Vieira et al (2011), Silva (2012) and Amparo (2014), Amparo et al (2014)

Objectives

Methods

Results

Conclusion