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Geometric nonlinear means under the condition of large deformation strain and displacement of the nonlinear relationship between the. When the structure of the large displacement, strain and displacement of a nonlinear relation, which means that the structure itself produces large displacement and large rotation. The so-called big, does not necessarily mean high value, but excluding and this displacement or rotation, will cause the results show great error, and makes analysis and calculation meaningless.

The geometric nonlinear effect in general can be divided into the following four categories

( 1) the large displacement ( or rotating ), small strain structure under a certain load, although the strain is relatively small. But will generate larger displacement. Then we must consider the effect of deformation _disibledevent="trans-result-tool">