科研之友
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摘要
Manufacturing processes such as welding cause residual stresses which exist in most steel civil structures, causing plastic deformations without any external loads. This type of stress is often overlooked during design. Nevertheless, residual stresses can have serious influence on the material strength and the fatigue life of the construction. This is also true for orthotropic steel decks which have many complex welding details. Since little is known about the distribution of residual stresses due to welding, a semi-destructive experimental test setup is developed for a stiffener-to-deck plate connection of an orthotropic steel deck. In particular, hole-drilling is used. The test procedure has been optimized to reduce measurement errors. The most important influencing factors on measurement accuracy are the surface preparation and the precision of the determination of the zero-depth. Once these measurement errors are optimized using proper grinding and visual inspection tools, a clear residual stress pattern becomes visible. The results confirmed the theoretical assumption of high tensile yield stresses near the weld location. However, at small distance from the weld, the residual stresses tend to decrease to almost zero.
- 出版日期2017-6
