Linear vs Nonlinear Analysis in STAAD Pro

In STAAD Pro, the main difference between linear and nonlinear analysis lies in the type of structural behavior that can be accurately simulated.

Linear Analysis

Linear analysis assumes that the response of the structure is directly proportional to the applied loads. This means that the material properties and structural geometry do not change significantly during the analysis. Linear analysis is suitable for relatively small displacements and loads within the elastic range of the materials.

Nonlinear Analysis

Nonlinear analysis, on the other hand, considers the nonlinear behavior of materials and structural elements. This includes large displacements, material yielding, and geometric nonlinearities. Nonlinear analysis is required for accurately modeling structures under extreme loading conditions, such as post-buckling behavior, plastic deformations, and large deflections.

In summary, while linear analysis is simpler and faster, nonlinear analysis provides a more realistic representation of structural behavior under complex loading conditions.