TAILIEUCHUNG - Inspection, Evaluation and Repair of Steel Structures P2

This concept may also be applied for a structure under constant load to quantify the susceptibility to fracture. Fracture is most likely to occur at locations where high tension stress and/or severe stress con- centration exist. Fatigue cracking due to repeated loading is more likely to occur (will occur sooner) at locations where high Sr and/or low fatigue categories exist. | EM 1110-2-6054 1 Dec 01 a. Fatigue cracks initiating from ends of welded stiffeners b. Cracks initiating from previous repair welds Figure 3-3. Fatigue cracks at end of stiffener and at weld repair b This concept may also be applied for a structure under constant load to quantify the susceptibility to fracture. Fracture is most likely to occur at locations where high tension stress and or severe stress concentration exist. Fatigue cracking due to repeated loading is more likely to occur will occur sooner at locations where high Sr and or low fatigue categories exist. Tensile stress level is analogous to Sr and severity of stress concentration is analogous to the particular fatigue category. Therefore fatigue Sr-N relationships can be used to identify the areas most susceptible to fracture in a statically loaded structure by the following procedure. First determine the fatigue category and nominal stress level for details subject to tensile loads. Second determine N with no consideration of fatigue limits from Figure 2-1 for each detail by substituting the nominal stress level for Sr. Finally rank the details according to their corresponding Nvalues. The details with the lowest N would be considered most critical. c In this application Nmay be viewed as an index that indicates susceptibility to cracking. Index factors for various stress levels and categories are shown in Table 3-1 lower values are more critical . These factors were derived by dividing N as determined by Figure 2-1 by 105. For riveted structures except where welds exist the highest stress areas will indicate the most critical locations since all details are Category D for stresses greater than MPa 10 ksi . 4 Fatigue categorization Girder-rib-skin-plate connection example. To illustrate determining fatigue categories and combining stress and detail for a welded connection a girder-rib-skin-plate connection that is common to tainter gates is examined. This connection and its fatigue .

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