Fatigue Design Procedure for Welded Hollow Section Joints: IIW Document XIII-1804-99 and IIW Document XV-1035-99: Recommendations of IIW Subcommission XV-E

This International Institute of Welding (IIW) report was presented at the 52nd Annual Assembly in Lisbon in June 1999. It contains recommendations representing a consensus on international best practice, focusing on a 'hot spot stress' approach.

A wide range of joint types is covered, the new fatigue design curve for both RHS and CHS is dealt with and detailed values for stress concentration factors are provided.

The purpose of this current IIW document is to serve both as an International Standards Organisation (ISO) draft specification and as a model standard for national and regional specifications worldwide.

The Recommendations (Part one) and Commentary (Part two) were edited by Dr X-L Zhao of Monash University, Australia and Professor J A Packer of the University of Toronto, Canada.

Part 1: Recommendations Part 2: Commentary Part 1: Recommendations

Scope and General - Scope - Referenced Documents - Definitions - Notation - Materials - Types of joints - Fatigue damage accumulation - Partial safety factor

Fatigue Design Procedures - Hot spot stress method - Design procedures

Fatigue Strength - Member forces - Nominal stress ranges - SCF calculations - Hot spot stress ranges - Fatigue strength curves

SCF Calculations for CHS Joints - Uniplanar CHS T and Y-joints - Uniplanar CHS X-joints - Uniplanar CHS K-joints with gap - Multiplanar CHS XX-joints - Multiplanar CHS KK-joints with gap - Minimum SCF values

SCF Calculations for RHS Joints - Uniplanar RHS T and X-joints - Uniplanar RHS K-joints with gap - Uniplanar RHS K-joints with overlap - Multiplanar RHS KK-joints with gap - Minimum SCF values

Appendices - Quality requirements for hollow sections - Weld details - A fatigue assessment procedure - SCF formulae and graphs for CHS joints - SCF formulae and graphs for RHS joints Part 2: Commentary