A normal Staged Construction Analysis is a nonlinear static analysis performed after each change to the structure, keeping track of the displacements, forces, and stresses from step to step.

At any stage during construction, additional analyses can be performed. These analysis continue based on the deformed state of the structure at that stage. Possible analysis types include:

• Moving Load and Influence Based Analysis
• Stressed Eigenvalue
• Progressive Collapse
• Pushover

Moving load and influence based live load analysis can be performed at any stage using the stiffness of the constructed and deformed structure. These results can be combined with the effect of construction loads to obtain extreme effects.

Siesmic activities may occur during construction. Stressed eigenvalue analysis can be performed at any stage using the stiffness of the loaded deformed structure, yielding the modes of the structure in its partially constructed state. LARSA 4D's stressed eigenvalue analysis performed after the final cosntruction stage will be considereably more accurate then a stressed eivenvalue analysis peformed without construction stages. Stressed eigenvalue analysis within staged construction will account for locked-in stresses.

Progressive collapse scenarios can be perofrmed at any stage simulating the loss of a pier or the snapping of a cable. An impact factor can be specified to account for dynamic effects. The structure model may include inelastic beams and springs to account for behaviour after yielding.

Pushover scenarios can be performed at any stage by specifying the load pattern and target displacements. LARSA 4D will incrementally apply the load pattern, utilizing the arc-length method for snap-through and buckling.