TUB 2765 SHS Welded Joints - Tata Steel

More documents

Recommendations

Info

Design of SHS welded joints Contents 1 Introduction 02 1.1 Product specification 03 2 Scope 04 2.1 Joint geometry 04 2.2 Material 06 2.3 Multiplanar joints 06 2.4 Load and moment interaction 07 3 General design guidance 08 3.1 Structural analysis 08 3.2 Welding 09 3.3 Fabrication 11 4 Parameters affecting joint capacity 13 4.1 General 13 4.2 Joint failure modes 13 4.3 Joints with a single bracing 15 4.4 Joints with a gap between bracings 16 4.5 Joints with cverlapped bracings 16 4.6 Joint reinforcement 17 5 Joint design formulae 20 5.1 CHS chord joints 20 5.2 RHS chord joints 25 5.3 Special joints in RHS 30 5.4 I- or H- section chord joints 32 6 Design examples 35 6.1 Girder layout and member loads 35 6.2 Design philosophy 36 6.3 RHS girder design 36 6.4 CHS girder design 39 7 List of symbols 43 7.1 General alphabetic list 43 7.2 Pictorial list 44 8 References 45 01 Design of SHS welded joints
1. Introduction In construction with structural hollow sections the members are generally welded directly to each other and, as a result, member sizing has a direct effect on both the joint capacity and the cost of fabrication. In order to obtain a technically secure, economic and architecturally pleasing structure, both the architect and design engineer must, from the very beginning, be aware of the effects that their design decisions will have on the joint capacity, the fabrication, assembly and the erection of the structure. Structural hollow sections have a higher strength to weight ratio than open section profiles such as I-, H- and L- sections. They also require a much smaller weight of protection material, whether this is a fire protection or corrosion coating, because of their lower external area. A properly designed steel construction using structural hollow sections will nearly always be lighter in terms of material weight than a similar construction made with open section profiles and, although structural hollow sections are more expensive than open section profiles on a per tonne basis, the overall weight saving of steel and protective coatings will very often result in a much more cost effective construction. This publication has been produced to show how the joint capacity of staticaly loaded joints can be calculated and how it can be affected by both the geometric layout and the sizing of the members. Considerable international research into the behaviour of structural hollow section (SHS) welded joints for lattice type constructions has enabled comprehensive design recommendations to be developed which embrace the large majority of manufactured structural hollow sections. These design recommendations have been developed by CIDECT (Comité International pour la Développement et l'Étude de la Construction Tubulaire) and the IIW (International Institute of Welding) and, as a result, have gained considerable international recognition and acceptance. They have been used in a series of CIDECT Design Guides [1,2] and are now incorporated into Eurocode 3 : Annex K.[3] The joint capacity formulae, reproduced in section 5, were developed and are presented in a limit states form and are therefore fully compatible with the requirements of BS 5950 : Part 1 [4] and Eurocode 3. A software program [5], called CIDJOINT, has been developed by CIDECT for the design of most of the joints described in this design publication. The CIDJOINT design program requires MS-Windows version 3.x (or higher). The design recomendations can be used with Corus Tubes Celsius ® hot finished hollow sections to EN 10219 [6, 7], cold formed Hybox ® 355 hollow sections to EN 10219 [8, 9] and cold formed Strongbox ® 235 hollow sections to Corus Tubes specification TS30 [10] Design of SHS welded joints 02
Page 1: Corus Tubes Design of SHS welded jo
Page 5 and 6: 2 Scope This publication has been w
Page 7 and 8: 2.2 Material The design formulae, g
Page 9 and 10: 3 General design guidance 3.1 Struc
Page 11 and 12: Figure 7 : Typical localised stress
Page 13 and 14: 3.3 Fabrication In a lattice type c
Page 15 and 16: Chord face deformation, figure 11,
Page 17 and 18: 4.4 Joint with a gap between bracin
Page 19 and 20: 4.6.2 Reinforcement of RHS chord ga
Page 21 and 22: 5. Joint design formulae When more
Page 23 and 24: For all these joint types, except t
Page 25 and 26: 5.1.7 CHS chords and I -, H - or RH
Page 27 and 28: Chord end load function - f(n) 1.0
Page 29 and 30: K- and N-gap joints 6.3 fy0 t 2 0
Page 31 and 32: I- or H-section bracings Base axial
Page 33 and 34: 5.4 I- or H-section chord joints Al
Page 35 and 36: 5.4.4 I - or H - section chords and
Page 37 and 38: 6.2 Design philosophy The following
Page 39 and 40: In all cases it has been necessary
Page 41 and 42: Bracing 26 : load +183kN Bracing 27
Page 43 and 44: 6.4.4.1 Re-selection of CHS sizes T
Page 45 and 46: 7.2 Pictorial h1 t1 q O v = q sin 0
Page 48: www.corusgroup.com Care has been ta

TUB 2765 SHS Welded Joints - Tata Steel

Create successful ePaper yourself

Delete template?

Save as template?