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Parametric sensitivity analysis of the stress state in the crack-prone areas of breathing webs
Kala, J. ; Kala, Z. ; Škaloud, Miroslav ; Teplý, B.
Within the framework of the Czech research on the cumulative damage process in, and the fatigue limit state of, steel plate girders under the action of many times repeated loading, the authors decided to perform a sensitivity analysis of the effect of initial imperfections on the state of stress in those areas of the breathing webs of the girders in which fastigue cracks develop under the effect of repeated loads. This paper describes a preparatory stage of the study; in whitch the theoretical apparatus needed is prepared, discussed and calibrated by way of comparing theoretical results obtained with the results of the tests carried out by one of the authors and his co-workers some time ago.
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Evaluation of accuracy of steel plate girder initial imperfections measurement carried out by means of fringe projection method
Valach, Jaroslav
The method of fringe projection and its application to investigation of steel plate girders subjected to repeated loading is described in this contribution. The well known fact of decisive role of production-based girders imperfections on the girders period of service emphasizes the need of a reliable measurement method of the imperfections. The optical method described in this paper is based on determination of out-of-plane deviations by means of analysis of geometrical relations in the image of projected fringe pattern on the girder surface. The advantage of the method is its simplicity, scalable sensitivity and absence of any constrains regarding the size of the studied object. The results obtained using the method are compared to that attained by the existing method and their accuracy and time consumption is considered. Finally, applicability of the proposed method in other fields is discussed.
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