OpenSees Examples Manual bacup: Difference between revisions

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Revision as of 19:04, 9 November 2009


The following examples are listed in order of simplicity.

NOTE: gravity analysis is always included as part of the model building.

Introductory Example

 

 

 

Objectives and Characteristics

Model Types

Analysis Types
OpenSees Example 1a. 2D Elastic Cantilever Column

 

 

 

  • overview of basic OpenSees input structure
  • coordinates, boundary conditions, element connectivity, nodal masses, nodal loads, etc.
  • two-node, one element
  • elastic elements
  • static pushover analysis
  • dynamic earthquake-input analysis
OpenSees Example 1b. Elastic Portal Frame

 

 

 
  • two element types
  • distributed element loads
  • elastic elements
  • static pushover analysis
  • dynamic earthquake-input analysis

 

<a id="h3620" class="" title="Simple Nonlinear-Analysis Example" href="3587.htm" target="_self">Simple Nonlinear Analysis Example</a>

 

 

 

Objectives and Characteristics

Model Types

Analysis Types

<a id="h3602" class="jumptemplate" title="Example 2a. Elastic Cantilever Column with variables" href="3599.htm" target="_self">Example 2a. Elastic Cantilever Column</a> with variables

 

 

<img src="3895.png" alt="Embedded Power-Point Image" height="171.05" width="160.6" vspace="0" hspace="0" align="bottom" border="0">
  • introduce variable: define & use
  • elastic element
  • static pushover analysis
  • dynamic earthquake-input analysis

<a id="h3603" class="" title="Example 2b. Nonlinear Cantilever Column: Uniaxial Inelastic Section" href="3600.htm" target="_self">Example 2b. Nonlinear Cantilever Column: Uniaxial Inelastic Section</a>

 

 

<img src="3896.png" alt="Embedded Power-Point Image" height="171.05" width="175.45" vspace="0" hspace="0" align="bottom" border="0">
  • first example of nonlinear model, set nonlinearity at section level
  • nonlinearBeamColumn element
  • uniaxial section
  • static pushover analysis
  • dynamic earthquake-input analysis

 

<a id="h3604" class="" title="Example 2c. Nonlinear Cantilever Column: Inelastic Uniaxial Materials in Fiber Section" href="3601.htm" target="_self">Example 2c. Nonlinear Cantilever Column: Inelastic Uniaxial Materials in Fiber Section</a>

 

 

<img src="3897.png" alt="Embedded Power-Point Image" height="171.05" width="218.9" vspace="0" hspace="0" align="bottom" border="0">
  • set nonlinearity at material level
  • material stress-strain response is assembled into fiber section
  • reinforced-concrete fiber section
  • nonlinearBeamColumn element
  • uniaxial material
  • fiber section (Reinforced-concrete fiber section)
  • static pushover analysis
  • dynamic earthquake-input analysis

 

 

<a id="h3621" class="" title="2D Structural Modelling & Analysis Examples" href="3588.htm" target="_self">2D Structural Modelling & Analysis Examples</a>

 

 

 

 

Objectives and Characteristics

Model Types

Analysis Types

<a id="h3503" class="" title="Example 3. 2D RC Cantilever" href="3472.htm" target="_self">Example 3. Cantilever Column</a> with units

 

 

 

<img src="3460.png" alt="Embedded Power-Point Image" height="213.95" width="103.4" vspace="0" hspace="0" align="bottom" border="0">
  • units, defined and used (they will be used in all subsequent examples)
  • separate model-building and analysis files
  • introduce PDelta effects (or not)
  • elastic elements
  • inelastic uniaxial section
  • fiber section (Reinforced-concrete fiber section)
  • Linear, PDelta or Corotational Transformation
  • static pushover analysis
  • dynamic earthquake-input analysis (uniform excitation)

<a id="h3504" class="" title="Example 4. 2D RC Portal Frame" href="3312.htm" target="_self">Example 4. Portal Frame</a>

 

 

 

<img src="3461.png" alt="Embedded Power-Point Image" height="202.4" width="234.3" vspace="0" hspace="0" align="bottom" border="0">
  • use previously-defined procedures to simplify input
  • introduce more analysis types
  • introduce procedure to read database input motion files (data with text in first lines)
  • elastic elements
  • inelastic uniaxial section
  • inelastic fiber section (Reinforced-concrete fiber section)
  • static pushover analysis
  • static reversed cyclic analysis
  • dynamic sine-wave input analysis (uniform excitation)
  • dynamic earthquake-input analysis (uniform excitation)
  • dynamic sine-wave input analysis (multiple-support excitation)
  • dynamic earthquake-input analysis (multiple-support excitation)
  • dynamic bidirectional earthquake-input analysis (uniform excitation)

<a id="h3505" class="" title="Example 5. 2D Frame ? 3-story, 3-bay (RC & W-section)" href="3326.htm" target="_self">Example 5. 2D Frame, 3-story 3-bay</a>, Reinforced-Concrete Section & Steel W-Section

 

<img src="3462.png" alt="Embedded Power-Point Image" height="234.3" width="380.6" vspace="0" hspace="0" align="bottom" border="0">
  • 2D frame of fixed geometry: 3-story, 3-bay
  • nodes and elements are defined manually, one by one
  • Reinforced-Concrete Section
  • Steel W-Section
  • elastic uniaxial section
  • inelastic uniaxial section
  • inelastic fiber section
  • static pushover analysis
  • static reversed cyclic analysis
  • dynamic sine-wave input analysis (uniform excitation)
  • dynamic earthquake-input analysis (uniform excitation)
  • dynamic sine-wave input analysis (multiple-support excitation)
  • dynamic earthquake-input analysis (multiple-support excitation)
  • dynamic bidirectional earthquake-input analysis (uniform excitation)

<a id="h3506" class="" title="Example 6. Generic 2D Frame, N-story, N-bay (RC & W-section)" href="3329.htm" target="_self">Example 6. generic 2D Frame, N-story N-bay</a>, Reinforced-Concrete Section & Steel W-Section

 

<img src="3502.png" alt="Embedded Power-Point Image" height="260.15" width="435.05" vspace="0" hspace="0" align="bottom" border="0">
  • 2D frame geometry of variable geometry ( # stories and # bays are variables)
  • node and element definition is automated
  • use previously-defined procedures to view model node numbers and elements, deformed shape, and displacement history, in 2D
  • Reinforced-Concrete Section
  • Steel W-Section
  • elastic uniaxial section
  • inelastic uniaxial section
  • inelastic fiber section
  • static pushover analysis
  • static reversed cyclic analysis
  • dynamic sine-wave input analysis (uniform excitation)
  • dynamic earthquake-input analysis (uniform excitation)
  • dynamic sine-wave input analysis (multiple-support excitation)
  • dynamic earthquake-input analysis (multiple-support excitation)
  • dynamic bidirectional earthquake-input analysis (uniform excitation)

 

<a id="h3622" class="" title="3D Structural Modelling & Analysis Examples" href="3589.htm" target="_self">3D Structural Modelling & Analysis Examples</a>

 

 

 

Objectives and Characteristics

Model Types

Analysis Types

<a id="h3507" class="" title="Example 7. 3D Moment-Resisting Frame (RC & W-section)" href="3330.htm" target="_self">Example 7. 3D Frame, 3-story 3-bayX 3-bayZ</a>, Reinforced-Concrete Section & Steel W-Section

<img src="3779.png" alt="Embedded Power-Point Image" height="372.9" width="298.65" vspace="0" hspace="0" align="bottom" border="0">
  • 3D frame of fixed geometry
  • nodes and elements are manually manually, one by one
  • introduce rigid floor diaphragm
  • use previously-defined procedures to view model node numbers and elements, deformed shape, and displacement history, in 3D
  • Reinforced-Concrete Section
  • Steel W-Section
  • Elastic or Fiber Section option is a variable within one input file
  • rigid diaphragm
  • static pushover analysis
  • static reversed cyclic analysis
  • dynamic sine-wave input analysis (uniform excitation)
  • dynamic earthquake-input analysis (uniform excitation)
  • dynamic sine-wave input analysis (multiple-support excitation)
  • dynamic earthquake-input analysis (multiple-support excitation)
  • dynamic bidirectional earthquake-input analysis (uniform excitation)

<a id="h3508" class="" title="Example 8. generic 3D Frame ? Nstory, NbayX,NBayZ (RC & W-section)" href="3332.htm" target="_self">Example 8. generic 3D Frame, NStory NBayX NBayZ</a>, Reinforced-Concrete Section & Steel W-Section

<img src="3904.png" alt="Embedded Power-Point Image" height="429" width="391.6" vspace="0" hspace="0" align="bottom" border="0">
  • 3D frame geometry of variable geometry ( # stories and # bays in X and Z are variables)
  • node and element definition is automated
  • introduce user-input interface, the user is given the option as to what to view in model
  • Reinforced-Concrete Section
  • Steel W-Section
  • Elastic or Fiber Section option is a variable within one input file optional rigid diaphragm
  • rigid diaphragm
  • static pushover analysis
  • static reversed cyclic analysis
  • dynamic sine-wave input analysis (uniform excitation)
  • dynamic earthquake-input analysis (uniform excitation)
  • dynamic sine-wave input analysis (multiple-support excitation)
  • dynamic earthquake-input analysis (multiple-support excitation)
  • dynamic bidirectional earthquake-input analysis (uniform excitation)

 

 

 

<a id="h3859" class="" title="Section Modelling And Analysis" href="3590.htm" target="_self">Section Modelling And Analysis</a>

 

 

<a id="h3585" class="" title="Example 9. Build a Fiber Section" href="3534.htm" target="_self">Example 9. Build & Analyze a Section</a>

 

 

<img src="3809.png" alt="Embedded Power-Point Image" height="414.15" width="534.6" vspace="0" hspace="0" align="bottom" border="0">
  • defined section using uniaxial behavior (define moment-curvature curve) or
  • define section using uniaxial materials (define stress curve) in fiber section

2D & 3D models of sections:

  • Uniaxial Nonlinear section
  • Fiber Steel W-section
  • Fiber RC symmetric rectangular unconfined-concrete section
  • Fiber RC symmetric rectangular unconfined & confined-concrete section
  • Fiber RC generalized rectangular section
  • Fiber RC generalized circular section
  • 2D & 3D static unidirectional moment-curvature analysis

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

<a href="3403.htm" target="_self"><img src="125.gif" alt="Previous Topic" height="17" width="18" vspace="0" hspace="0" align="bottom" border="0"></a>

<a href="3389.htm" target="_self"><img src="124.gif" alt="Next Topic" height="17" width="18" vspace="0" hspace="0" align="bottom" border="0"></a>





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