PSI - Issue 13

Petr Lehner et al. / Procedia Structural Integrity 13 (2018) 1539–1544 Lehner P., K ř ivý V., Krejsa M., Pa ř enica P., Kozák J./ Structural Integrity Procedia 00 (2018) 000–000

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2. Structural analysis procedure As mentioned, the overall prediction process of residual service life of the historical steel structure loaded by overhead cranes includes several separate parts. The procedure of structural analysis can be divided into three main parts: first is the comprehensive 3D model prepared in the Scia Engineering software ( Scia Engineering, online ), second is the stochastic analysis of the load history based on Monte Carlo and Rain Flow methods , and the last is the FEM model created in Ansys Workbench software (ANSYS, 2016), that served the estimation of residual service life. For estimation of residual service life the detail of selected diagonal connection was chosen. Connection contains a gusset plate, rivets and connecting diagonal. To determine the stress of the connection, it is necessary to determine the normal forces acting in the diagonal. 2.1. Comprehensive 3D model The numerical 3D model of the supporting steel truss frame was created. The diagonal was selected according to the criterion of the maximum stress from the moving load. The selected diagonal No. B355 is in the middle of the span (See Fig. 1 and 2). The 3D model served to determine the diagonal that is most affected by the moving load, also to obtain the influence line of the moving load on the diagonal. For description of the influence line, a pair of movable forces (2x50 kN) were placed along the length of the path.

Fig. 2. The model of supporting steel structure of the crane track in Scia Software.

(a) (b) Fig. 3. Part of the supporting steel structure of the crane track. A realistic view (a) and model of construction with the marked diagonal B355 (b).