Example Description

This example uses a fixed base cantilever column to test static nonlinear analysis with large bending displacements in this model. A concentrated moment, M, is applied at the top of the column. The moment M is increased until the rotation at the top of the column is equal to π radians (180 degrees). The resulting vertical and horizontal displacements of the top of the column and the moment required to create the desired deflected shape are compared with independent hand calculated results. Three different models, labeled A, B and C are run for this example. The models are identical except for the discretization of the column, which is broken up into 4, 16 and 64 elements in models A, B and C, respectively. After running the analysis, use the Display menu > Show Deformed Shape command to display the deflected shape. To get the deflected shape to display properly, uncheck the cubic curve option, select the Scale Factor option in the Scaling area of the form, and set the Scale Factor to 1. Note that for this problem with large bending displacements the iteration convergence tolerance for the nonlinear static load case is set to 1E-06. Large displacements problems often require tighter iteration tolerances.

Tested Features

Static nonlinear analysis of frame structure with large bending displacements using this model P-Delta plus large displacements option

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