Nonlinear Design
Displacement-based and Energy Methods

The focus of the course will be on nonlinear design methods. The current nonlinear design methods are displacement-based, and future methods will most likely be energy-based. Since energy-based methods are still in their infancy, we will discuss only displacement based methods here.

The focus of displacement-based design is on determining the inelastic displacements of the structure. In particular, the inelastic interstory drift is to be determined, from which the beam plastic rotations and thus stability and non-structural damage information can be determined. The basic process, which will be developed in detail later in the course, can be described as follows: