Evaluation of Crack Initiation Points of Load-Carrying Cruciform Welded Joints Based on Effective Notch Stress Approach
:
https://doi.org/10.9744/ced.16.2.68-74
Keywords:
Crack initiation point, effective notch stress, load-carrying cruciform welded joints, weld root.Abstract
For fatigue assessment, recently effective notch stress (ENS) approach is accepted as a valid alternative to fracture mechanics approaches in Japan. However, at least one study showed that the fatigue assessment at weld root of load-carrying cruciform welded joints based on ENS approach does not capture the influence of plate thickness, weld size and weld penetration. Consequently, there are still uncertainties about the fatigue assessment. This paper discusses the evaluation method of the joints based on ENS approach. Effects of weld size, weld penetration, and plate thickness on ENS are determined by using fine-meshed FEM analyses. Validity of this method is determined by comparing the evaluation results with fracture mechanics approach. It is shown that results from this method are comparable to those of the previous study and the results seem to be conservative when ratio of weld penetration to plate thickness becomes smaller and plate thickness becomes larger.References
Kinoshita, K., Seismic Behavior of Fatigue-Retrofitted Steel Frame Piers, Civil Engineering Dimension, 15(2), 2013, pp. 81-88.
Morikawa, H., Shimozato, T., Miki, C., and Ichikawa, A., Study on Fatigue Cracking in Steel Bridge Piers with Box Section and Temporally Repairing, Journal of Structure Mechanics and Earthquake Engineering, Japan Society of Civil Engineers, 703, 2002, pp. 177-183. (In Japanese).
Miki, C., Ichikawa, A., Sakamoto, T., Tanabe, A., Tokida, H., and Shimozoto, T., Fatigue Performance of Beam-to-Column Connections with Box Sections in Steel Bridge Frame Piers, Journal of Structure Mechanics and Earthquake Engineering, JSCE, 710, 2002, pp. 361-371. (In Japanese).
Miki, C., Kinoshita, K., Kato, M., Sasaki, E., Shimozato, T., and Machida, F., Fatigue Strength of Steel Bridge Bents with Circular Column and Its Improvement, Doboku GakkaiRonbunshuu, JSCE, 801, 2005, pp. 97-111. (In Japanese).
Konishi, T., Miki, C., Hirabayashi, Y., and Shimozato, T., Inspection and Repair of Fatigue Cracks in Steel Bridge Piers, IIW Annual Assembly, International Institute of Welding, Doc. XIII- 2026-04, 2004.
Kinomoto, T., Miki, C., Hirabayashi, Y., Konishi, T., Tokida, H., and Shimozato, T., Plate Arrangement and Characteristic Internal Flaw in Beam-Column Connection of Steel Pier, IIW Annual Assembly, International Institute of Welding, Doc. XIII-1975-03, 2003.
Shimozato, T., Miki, C., Tokida, H., Machida, F., Yaginuma, Y., and Ono, S., Fatigue Properties and Retrofitting of Existing Steel Bridge Frame Piers with Full Scale Specimen, Doboku GakkaiRonbunshuu A, JSCE, 66(3), 2010, pp. 406-419. (In Japanese).
Miki, C., Tokunaga, K., and Hanji, T., Weld Repair for Fatigue Cracked Joints in Steel Bridges by Low Temperature Transformation Welding Material, Welding in the World, 56(3-4), 2012, pp. 40-50.
Miki, C., Ichikawa, A., Tanabe, A., and Kinoshita, K., Rib Installation Effects for Fatigue Strengths of Beam-to-Column Connections，IIW Annual Assembly, International Institute of Welding, Doc. XIII-2025-04，2004.
Kainuma, S., Mori, T., and Ichimiya, M., Evaluation Method for Fatigue Failure Modes in Load-Carrying Fillet Welded Cruciform Joints, Journal of Structure Mechanics and Earthquake Engineering, JSCE, 668, 2001, pp. 313-318. (In Japanese)
Kainuma, S. and Mori, T., A Study on the Fatigue Crack Initiation Point of Load-Carrying Fillet Welded Joints, International Journal of Fatigue, 30, 2008, pp. 1669-1677.
Hobbacher, A., Recommendations for Fatigue Design of Welded Joints and Components, IIW document, XIII-2151-07/XV-1254-07, Paris, France, 2007.
Miki, C., Fatigue Damage in Orthotropic Steel Bridge Decks and Retrofit Works, International Journal of Steel Structures, 6, 2006, pp. 255-267.
Park, W. and Miki, C., Fatigue Assessment of Large-Size Welded Joints based on the Effective Notch Stress Approach, International Journal of Fatigue, 30, 2008, pp. 1556-1568.
Mori, T. and Myoken, M., Applicability of Effective Notch Stress Conception to Fatigue Strength Evaluation for Cruciform Welded Joints failing from Weld Root, IIW Annual Assembly, International Institute of Welding, Doc. XIII-2231-08, 2008.
Kinoshita, K. and Arakawa, S., Evaluation of Fatigue Crack initiation Point of Load Carrying Cruciform Welded Joints, Proceeding of 33rd IABSE Symposium onSustainable Infrastructures, Paper ID 364-07-01, 2009.
Kinoshita, K. and Arakawa, S., Influence of Incomplete Penetration Size on Fatigue Crack Initiation Points of Load-Carrying Cruciform Welded Joints, Steel Construction Engineering, 64, 2009, pp. 65-70. (In Japanese)
Kinoshita, K. and Arakawa, S., Investigation of Evaluation Method for Fatigue Crack Initiation Points of Load Carrying Cruciform Welded Joints by using Effective Notch Stress, Proceeding of Constructional Steel, 18, 2010, pp. 121-126. (In Japanese)
DIANA, DIANA 9.4 User’s Manual, TNO DIANA BV, 2010.
Japan Society of Steel Construction, Fatigue Design Recommendation for Steel Structure, 1995.
Albrecht, P. and Yamada, K., Rapid Calculation of Stress Intensity Factors, Proceeding of ASCE, 103(2), 1977, pp. 377-389.
Frank, K.H. and Fisher, J.W., Fatigue Strength of Fillet Welded Cruciform Joints, Proceeding of ASCE, 105(9), 1979, pp. 1729-1740.
Mori, T. Kainuma, S. and Miki, C., Fatigue Strength Analysis of Load-Carrying Fillet Welded Cruciform Joints, Journal of Structural Engineering, JSCE, Vol. 39A, 1993, pp. 937-946. (In Japanese)
Downloads
Published
How to Cite
Issue
Section
License
Authors who publish with this journal agree to the following terms:- Authors retain the copyright and publishing right, and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) followingthe publication of the article, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
