5. Analysis Commands¶
In OpenSees, an analysis is an object which is composed by the aggregation of component objects. It is the component objects which define the type of analysis that is performed on the model. The component classes, as shown in the figure below, consist of the following:
ConstraintHandler – determines how the constraint equations are enforced in the analysis – how it handles the boundary conditions/imposed displacements
DOF_Numberer – determines the mapping between equation numbers and degrees-of-freedom
Integrator – determines the predictive step for time t+dt
SolutionAlgorithm – determines the sequence of steps taken to solve the non-linear equation at the current time step
SystemOfEqn/Solver – within the solution algorithm, it specifies how to store and solve the system of equations in the analysis
Convergence Test – determines when convergence has been achieved.