Simplified Effective Notch Stress calculation for non-overlapping circular hollow section K-Joints

This paper presents two simplified procedures for the calculation of the Effective Notch Stress (ENS) on non-overlapping circular hollow section (CHS) K-joints. The proposed procedures aim to alleviate the modeling challenges associated with the traditional ENS calculation on joints with complex geo...

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Bibliographic Details
Published in:Marine structures 2017-09, Vol.55, p.1-16
Main Authors: Pradana, Mochamad Raditya, Qian, Xudong, Swaddiwudhipong, Somsak
Format: Article
Language:English
Subjects:
Effective Notch Stress
Extrapolation
Extrapolation method
Fatigue assessment
Fatigue life
Frameworks
Geometry
Joints (timber)
Mathematical models
Modelling
Parametric equations
Procedures
Steel
Stress-strain curves
Stresses
Structural hot-spot stress
Studies
Tubular joint
Welded connection
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Summary:This paper presents two simplified procedures for the calculation of the Effective Notch Stress (ENS) on non-overlapping circular hollow section (CHS) K-joints. The proposed procedures aim to alleviate the modeling challenges associated with the traditional ENS calculation on joints with complex geometry, such as the CHS joints. The first procedure is an extension of the recently proposed extrapolation method, similar to the extrapolation in the widely-used Structural Hot-Spot Stress (SHSS) approach. The second procedure provides ENS estimations based on the parametric relationship between the ENS and SHSS. Through an extensive numerical study, this investigation develops parametric equations supporting each procedure, covering practical geometric range for CHS K-joints under balanced brace axial load. Both simplified procedures demonstrate close agreement with the traditional ENS calculation and provide reasonable fatigue life assessments with a substantial number of experimental data, based on the S-N framework. •This paper presents two simplified approach to estimate notch stresses for K-joints.•The extrapolation method removes the requirement for modeling the notch radius.•The method using the hotspot and notch stress ratio reduces further the mesh demand.•Both methods agree closely with the original approach recommended by IIW.•FAT 225 S-N curve provides conservative assessments for both methods.
ISSN:0951-8339
1873-4170
DOI:10.1016/j.marstruc.2017.04.006