Nonlinear construction stages

The Analysis of Construction Stages (ACS) can be perform also as a non-linear analysis. Everything that was explained for linear Analysis of Construction Stages is valid also for this advanced type of calculation. There are a few differences.

Project parameters

In the Project setup > Functionality item Nonlinearity and sub item 2nd order – geometrical nonlinearity must be selected.

Tangent versus parallel connection of a new member

The setup dialogue for construction stages offers one more parameter.

Connection of a new member

This parameter defines the geometrical configuration used for the connection of a new member in a new construction stage.

tangent: the new member is attached to the "old" member in the direction of the tangent to the deformation line of the "old" member

parallel: the new member is attached to the end of the deformed "old" member in the direction parallel to the direction of the new member on an undeformed structure.

The picture demonstrates the two options. The left hand side of the picture shows the tangent option. The right hand side, on the other hand, contains the second option.

image\nonlinstages.gif

TDA – Time Dependent Analysis

It is not possible to perform Time Dependent Analysis in combination with nonlinear analysis of construction stages.

Running the calculation

Procedure to run nonlinear ACS

  1. Call menu function Calculation, Mesh > Calculation.

  2. Select Nonlinear stage analysis.

  3. Click [OK] to start the calculation.