Σε αυτό το παράδειγμα, we’ll demonstrate how to analyze a beam stiffened with horizontal and vertical elements and subjected to axial and shear forces. The beam has a length of 4000 mm and is reinforced with two horizontal stiffeners having a closed section, as well as three vertical stiffeners. The top and bottom flanges have a thickness of 16 χιλ, the web is 10 mm thick, the longitudinal ribs are 5 mm thick, and the vertical stiffeners are 15 mm thick. The beam’s ends are configured with rolled and pinned boundary conditions. The beam subjected to an axial load of 15000 kN and shear forces of 2000 ΚΝ. The materials have a yield strength (fy) του 355 MPa.
Βήμα 1. Model Parts
Go to the ‘Main Parts’ menu and select the ‘PROFILE’ αυτί. To input the sections’ γεωμετρία, import a DXF file stored locally on your PC. The dxf file can be received from εδώ
Click ‘Update t’ button. Pick side edges (21,8) and set thickness (τ) προς το 0 χιλ.
Navigate to the ‘SCHEME’ αυτί. Configure two segments, setting the length of each to 2000 χιλ. When you click on the ‘Updated plate t’ column cell, a popup window will appear. In this window, update the thickness for each segment’s edges: set top flanges to t=16 mm, the web to t=10 mm, and ribs to t=5 mm.
Add diaphragms to the sections, selecting the ‘Polygon’ τύπος. The edges for the diaphragm are defined in a popup window that appears when you click on the ‘Diaphragm Edges’ column cell. In the ‘DIAPHRAGM INPUT’, select the edges that form the diaphragm shape and input the thickness (τ).
Βήμα 2. Πλέγμα
Navigate to the ‘Meshing’ μενού. Set the FE element size to 50 χιλ, then click the ‘Generate’ κουμπί.
Βήμα 3. Boundaries and Load
Navigate to the ‘Boundaries‘ > ‘Rigid Ends’ menu. Set the end boundary constrains. Navigate to the ‘Loads‘ > ‘Rigid Ends’ menu. Apply an axial load of 15000 kN to the left end of the member for compression.
Go to the ‘Loads > ‘Force Area (Εθιμο)‘ menu. Add a new Load group named ‘Group: 1’. Select the elements both above and below the central vertical stiffener, and then assign a shear load Fz of 2000 ΚΝ
Βήμα 4. Analysis and Load-Displacement tracking
Navigate to the ‘Analysis‘ menu. Select Nonlinear Explicit including geometry and material nonlinearity. Click ‘Perform Analysis’ button.
While the analysis is in progress, navigate to ‘Chart’ menu. Πρώτα, select a node to measure the Ux displacement (βήματα 1 και 2). Τότε, using frame selection, choose nodes from which to extract the Rx reaction forces (βήματα 3 και 4). Monitor the chart’s changes to identify the critical force (Pcr) that leads the structure to failure. Terminate the ongoing analysis once the failure state is detected.
Βήμα 5. Αποτελέσματα
Navigate to the ‘Results’ μενού, choose your preferred results options, and click ‘Display’ to view the deformed state of the model.
