Full-size testing to determine stress concentration factors of dragline tubular joint
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Full-size testing to determine stress concentration factors of dragline tubular joint
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Full-size testing to determine stress concentration factors of dragline tubular joints

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Engineering Structures 31 (2009) 43-56

A b s t r a c t
This paper describes the determination of stress concentration factors (SCFs) of dragline tubular joints
through laboratory testing of four full-size dragline tubular joints. Strip gauges are installed both outside
and inside the footprint of the joints to measure stress distribution at the weld toe and weld root.
Measurements for SCF are carried out for two load cases, i.e. tension or compression forces in the main
chord alone and tension or compression forces in the vertical bracings alone with reaction forces in the
inclined braces. The relationship of the SCF between the corresponding weld toes and weld roots are
presented in the paper. The weld profile and weld root gaps that have been measured using the silicon
imprint technique and feeler gauges, provide valuable information for future FE simulation and weld root
failure study using the effective notch stress approach.



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