P 895 - Test-based fatigue strength of wheel load application
In building construction, crane construction and materials handling technology, the movement of goods and machines results in travelling individual loads, which generally act as wheel loads on the supporting structures …
Content
- Publication
- 2014
- Authors
- Prof Kuhlmann, Prof Roos
In building construction, crane construction and materials handling technology, the movement of goods and machines results in travelling individual loads, which generally act as wheel loads on the supporting structures, which are usually made of steel. The connections and joints of these structures experience a state of stress from localised compressive and shear stresses in the area where the wheel load is applied, which are superimposed with global stresses from beam bending and shear force. As this multi-axial stress state occurs with every rollover, fatigue damage can be caused to the connections and joints. In contrast to the old national design rules for cranes and crane runways, which contained comparable calculation and strength approaches for fatigue verification, the new European design rules for cranes and crane runways are different.
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As a result, a number of design details with wheel load introduction for cranes, including the welded flange-web connection, are classified more favourably in terms of their fatigue strength compared to crane runways of the same design. The notch case classification of these design details has so far been derived theoretically in all design standards, as there are no corresponding fatigue tests. The state of the art in science and technology with regard to the known fatigue tests on construction details with wheel load introduction is presented. An overview of the known evaluation concepts for welded joints under multi-axial fatigue loading is given. Based on this knowledge, a test programme consisting of fatigue tests on crane runway girders with welded flange-web connections under stationary swelling and overrolling wheel loads was designed. The investigation of both types of wheel loads takes into account that overrolling wheel loads lead to a non-proportional fatigue load and fixed swelling wheel loads lead to a proportional multi-axial fatigue load. The fatigue strength of the tested flange-web connections was determined on the basis of nominal and notch stresses. Both the empirical fatigue strength hypotheses and more recent assessment approaches such as selected critical section plane hypotheses and integral stress hypotheses were used to assess the multiaxial fatigue stress.
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P 895 - Test-based fatigue strength of wheel load application—
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