BS ISO 14347:2008

Foreword
1 Scope
   1.1 General
   1.2 Materials
   1.3 Types of joints
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Cumulative fatigue damage
6 Partial safety factor
7 Fatigue design procedures
   7.1 Hot-spot stress method
   7.2 Design procedures
8 Fatigue strength
   8.1 Member forces
   8.2 Nominal stress ranges
   8.3 SCF calculations
   8.4 Hot-spot stress ranges
   8.5 Fatigue strength curves
9 SCF calculations for CHS joints
   9.1 Uniplanar CHS T- and Y-joints
   9.2 Uniplanar CHS X-joints
   9.3 Uniplanar CHS K-joints with gap
   9.4 Multiplanar CHS XX-joints
   9.5 Multiplanar CHS KK-joints with gap
   9.6 Minimum SCF values
10 SCF calculations for RHS joints
   10.1 Uniplanar RHS T- and X-joints
   10.2 Uniplanar RHS K-joints with gap
   10.3 Uniplanar RHS K-joints with overlap
   10.4 Multiplanar RHS KK-joints with gap
   10.5 Minimum SCF values
Annex A (normative) - Quality requirements for hollow sections
Annex B (normative) - Weld details
Annex C (informative) - A fatigue assessment procedure
Annex D (normative) - SCF equations and graphs for CHS joints
Annex E (normative) - SCF equations and graphs for RHS joints
Bibliography

Provides recommendations for the design and analysis of unstiffened, welded, nodal joints in braced structures composed of hollow sections of circular or square shape (with or without rectangular chord) under fatigue loading.

1.1 General This International Standard gives recommendations for the design and analysis of unstiffened, welded, nodal joints in braced structures composed of hollow sections of circular or square shape (with or without rectangular chord) under fatigue loading. This International Standard applies to structures: fulfilling quality requirements for hollow sections (see AnnexA); complying with recommended weld details (see AnnexB); employing permitted steel grades (see 1.2); having hollow section joints (see 1.3); having either square or rectangular hollow sections with a thickness between 4mm and 16mm, or circular hollow sections with a thickness between 4mm and 50mm; having as stress range the range of “hot-spot” stress; having identical brace (branch) members. 1.2 Materials This International Standard applies to both hot-finished and cold-formed steel structural hollow sections, complying with the applicable national manufacturing specification, that fulfil specified quality requirements (see AnnexA). 1.3Types of joints This International Standard applies to joints consisting of circular hollow sections (CHS) or rectangular hollow sections (RHS) as used in uniplanar or multiplanar trusses or girders, such as T-, Y-, X-, K-, XX-, and KK-joints (see Figure1 and Figure2).