OpenSees Example 2b. Nonlinear Cantilever Column: Uniaxial Inelastic Section

Introduction

This is the first example of a nonlinear model.

The nonlinear beam-column element that replaces the elastic element of Example 2a requires the definition of the element cross section, or its behavior. In this example, the Uniaxial Section used to define the nonlinear moment-curvature behavior of the element section is "aggregated" to an elastic response for the axial behavior to define the required characteristics of the column element in the 2D model. In a 3D model, torsional behavior would also have to be aggregated to this section.

Input

Static Pushover Files Ex2b.Canti2D.InelasticSection.Push.tcl

Dynamic EQ Ground Motion Files Ex2b.Canti2D.InelasticSection.EQ.tcl BM68elc.acc (ground-motion file)

Run

• To run Static Pushover analysis:

source Ex2b.Canti2D.InelasticSection.Push.tcl

• To run EQ ground-motion analysis (BM68elc.acc needs to be downloaded into the same directory):

source Ex2b.Canti2D.InelasticSection.EQ.tcl

Notes

In this example, both the axial behavior (typically elastic) and the flexural behavior (moment curvature) are defined indepenently and are then "aggregated" into a section. This is a characteristic of the uniaxial section: there is no coupling of behaviors.

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