The implementation of each section is provided in each derived-class. The name of each section derived-class has the following structure:

Formulation-Dimension-Name.hpp

.

Name	Description
Formulation	Stands for either Linearized (lin), or Fiber (fib).
Dimension	One-dimensional (1D) or two-dimensional (2D).
Name	The name of the section.

The Section class defines a cross-section to be assigned in an structural element. The Section class is designed to:

Have an internal structure suitable for linear and nonlinear behavior.
Provide with a richer structure to allow pre-defined and user-define geometries.

The main member function in Section are:

Section::CommitState()
This function sets the trial variables as converged ones.
Section::UpdateState()
This function computes the new trial states dor a given strain.

Each derived class are provided with the member function:

Section::GetStrain()
This function returns the generalized trial strain.
Section::GetStress()
This function returns the generalized stress associated to the trial strain.
Section::GetInitialTangentStiffness()
This function returns the tangent stiffness associated to the trial strain.

This object also provides with private member functions to compute the section's geometric properties as well as internal forces developed in the section. A Section object is meant to be used in frame elements such as lin2DFrame2, kin2DFrame2, lin3DFrame2, and kin3DFrame2, as well as shell elements like lin3DShell4.

The following section derived classes are available in SVL: