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Keywords: steel guyed mast, welded gusset plate joints, welding residual stresses, residual stress relaxation, welding, wind loading.

Summary

Failure of welded gusset plate joints in steel guyed masts due to cyclic stresses with a high mean value and amplitude is one of the major causes for their collapse when subjected to wind loading. To prevent the failure of the welded gusset joints, it is essential to assess the dynamic stress field in welded joints under wind loading. In deference to the global static buckling analysis of welded steel structures where the effects of residual stresses are very small and can be ignored, the welding residual stresses play an important role in assessing the cyclic stresses of gusset plate joints of guyed masts under wind loading. Hence, the residual stresses due to welding have to be included in the assessment. For this, the welding residual stress field in welded joints is first simulated using a numerical thermal-structural coupling analysis. The welding residual stresses are then assigned to a multi-scale finite element model as the initial stress field for the dynamic stress analysis of the welded joints, including a relaxation of the welding residual stresses. The results for the welding residual stress field and for the dynamic cyclic stress field are verified by laboratory tests. The peak value of the resulting cyclic stress is found to occur at the tip of the weld seams, and it results to high mean value and amplitude of cyclic stresses at the tips. Hence, the tips of weld seams are likely to be critical locations, where the welded gusset plate joint may fail due to cyclic stress fatigue under wind loading, and leading to the collapse of the guyed mast.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 108 PROCEEDINGS OF THE FIFTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: J. Kruis, Y. Tsompanakis and B.H.V. Topping Paper 31 Dynamic Assessment for Welding and Wind-Induced Stresses at Welded Joints of Steel Guyed Masts W.-L. Qu¹, Y.-L. Pi² and M.A. Bradford² ¹Hubei Key Laboratory of Roadway Bridge and Structural Engineering, Wuhan University of Technology, China ²Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia doi:10.4203/ccp.108.31 purchase the full-text of this paper Full Bibliographic Reference for this paper W.-L. Qu, Y.-L. Pi, M.A. Bradford, "Dynamic Assessment for Welding and Wind-Induced Stresses at Welded Joints of Steel Guyed Masts", in J. Kruis, Y. Tsompanakis, B.H.V. Topping, (Editors), "Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 31, 2015. doi:10.4203/ccp.108.31 Keywords: steel guyed mast, welded gusset plate joints, welding residual stresses, residual stress relaxation, welding, wind loading. Summary Failure of welded gusset plate joints in steel guyed masts due to cyclic stresses with a high mean value and amplitude is one of the major causes for their collapse when subjected to wind loading. To prevent the failure of the welded gusset joints, it is essential to assess the dynamic stress field in welded joints under wind loading. In deference to the global static buckling analysis of welded steel structures where the effects of residual stresses are very small and can be ignored, the welding residual stresses play an important role in assessing the cyclic stresses of gusset plate joints of guyed masts under wind loading. Hence, the residual stresses due to welding have to be included in the assessment. For this, the welding residual stress field in welded joints is first simulated using a numerical thermal-structural coupling analysis. The welding residual stresses are then assigned to a multi-scale finite element model as the initial stress field for the dynamic stress analysis of the welded joints, including a relaxation of the welding residual stresses. The results for the welding residual stress field and for the dynamic cyclic stress field are verified by laboratory tests. The peak value of the resulting cyclic stress is found to occur at the tip of the weld seams, and it results to high mean value and amplitude of cyclic stresses at the tips. Hence, the tips of weld seams are likely to be critical locations, where the welded gusset plate joint may fail due to cyclic stress fatigue under wind loading, and leading to the collapse of the guyed mast. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £75 +P&P)
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