Abstract
On the premise of only considering along-wind effect on guyed mast, the influence of welding residual stress on the fatigue life of welded joints is evaluated in this paper. Since the sum of residual stress and along-wind-induced dynamic stress exceeds the yield strength of structural steel, the effect of residual stress relaxation is included in the numerical analysis. The multiscale finite element analysis of guyed mast is developed in order to capture accurately stress field distribution of welded joint for the “welding-wind-induced” case in which both residual stress and along-wind-induced stress are taken into consideration, and the stress response characteristics at fatigue critical point of welded joints are pointed out. It is found that the “welding-wind-induced” stress field of welded joint can be approximately considered as multiaxial proportional loading state and hence the stress-based von Mises criterion can be adopted to evaluate the fatigue life of welded joints. Based on the S-N curve of stress fatigue life for welded specimens with structural steel commonly used in guyed masts, the fatigue damage of key welded joints is predicted, and as a consequence, the influence of welding residual stress on the fatigue life of welded joints is discussed.
Highlights
Guyed mast is a kind of widely used wind-sensitive structure
Due to the characteristics of high flexibility and lightweight, welded joints of the guyed mast are vulnerable to long-term strong wind load, which may induce severe fatigue damage at weld seams. erefore, there is great need to predict fatigue life of welded joints of such flexible steel structure
In the field of fatigue life prediction of flexible structures under strong wind load, Wirsching and Shehata [1] proposed a design method for high-cycle fatigue according to the improved probability-based Palmgren–Miner (P-M) rule and rain-flow counting method
Summary
Guyed mast is a kind of widely used wind-sensitive structure. Due to the characteristics of high flexibility and lightweight, welded joints of the guyed mast are vulnerable to long-term strong wind load, which may induce severe fatigue damage at weld seams. erefore, there is great need to predict fatigue life of welded joints of such flexible steel structure. For this guyed mast structure, the commercial finite element program ANSYS is adopted to establish its multiscale finite element model, in which BEAM44 element with meter scale, LINK10 element with meter scale, SOLIID45 element with centimeter scale, and SOLIID95 element with millimeter scale are selected for beam, cable, gusset plates, and weld seams, respectively.
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