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PROCEEDINGS OF THE FIFTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: J. Kruis, Y. Tsompanakis and B.H.V. Topping
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
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.
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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