October 8, 2024

How to Troubleshoot Large Deflections in RISA-3D?

Deflection is a key tool for verifying whether your model was built correctly in RISA-3D. After solving, you can view the deflected shape to confirm if the deflections are within the expected range. If you notice abnormal deflections, use the following steps to troubleshoot the issue. Steps for Investigating Large Deflections Check Member Material Properties: Ensure that the correct material properties are assigned to your members. Incorrect materials can result in inaccurate stiffness and deflections. Review Member Sizes: Verify that your members are sized appropriately for the loads they are designed to carry. Oversized or undersized members can affect deflections significantly. Examine Member Connectivity: End Releases: Incorrectly applied end releases can result in overly flexible members. Analysis Offsets: Verify that any analysis offsets are accurate, as these can influence the effective stiffness of the members. Plate Connectivity: Remember that plates only connect to other elements at their corner nodes, not along edges. Verify all plates are supported at their corners. Inspect Boundary Conditions: Ensure that your supports and restraints are correctly defined. Improper boundary conditions can lead to unexpected deflections. Review Applied Loading: Pay close attention to the magnitude and direction of your applied loads. Misapplied loads may cause unexpected…

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