![]() The non-linear load combinations must be solved iteratively and therefore are potentially time consuming. If there are no nonlinear elements present in the model, only the P-Delta load combinations are set to be nonlinear while the rest of load combinations are linear. ![]() If a model includes one or more nonlinear elements (compression-only springs or tension-only springs), the entire problem becomes nonlinear, that is, all load combinations are assigned to be nonlinear. The program assigns each load combination to be linear or nonlinear just before analysis is performed. However, the program only accounts for the P-Delta effect on members. The P-Delta effect exists in both members and shell elements. Generally, a tensile axial force increases the element bending stiffness while a compressive axial force reduces the element bending stiffness. The P-Delta effect refers to the axial stress influence on the element bending stiffness. The program currently handles two types of nonlinearity: the element nonlinearity when compression-only springs or tension-only springs are present, and the geometric nonlinearity which is commonly known as the P-Delta effect. Otherwise the nonlinear analysis must be applied. The linear analysis may be applied to models where structural responses such as the displacements are expected to be linearly related to the applied loads. The program is capable of performing linear and nonlinear static analyses. ![]()
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March 2023
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