Getting Started with OpenSees -- Problem Definition

• GettingStarted Manual
  • Introduction
  • Download OpenSees
  • Run OpenSees
  • Problem Definition
  • Model Builder
  • Nodes
  • Elements
  • Recorders
  • Summary of Model-Building Input File
  • Loads and Analysis
  • Gravity Loads
  • Summary of Gravity Loads
  • Lateral Loads -- Static Pushover
  • Lateral Loads -- Cyclic Lateral Load
  • Lateral Loads -- Dynamic ground motion

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A portal frame will be used to demonstrate the OpenSees commands. A structural model will be defined first. Subsequently, a number of static and dynamic analyses will be defined and implemented.

The structural model consists of the planar portal frame shown in the figure below:

The columns and beam will be modeled as elastic elements. At a more advanced level, these elements can be replaced by more refined element models.

In the analysis phase, the frame will be subjected to three different load cases:

1. DISPLACEMENT-CONTROLLED LATERAL PUSHOVER;
2. DISPLACEMENT-CONTROLLED REVERSED CYCLIC LATERAL LOADING;
3. DYNAMIC GROUND-MOTION-INPUT TRANSIENT ANALYSIS.

In all cases, however, the frame will be subjected to constant static gravity loads:

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