OpenSees Example 9. Build & Analyze a Section Example: Difference between revisions

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:::2. In the 3D model, torsional stiffness needs to be aggregated to the section
:::2. In the 3D model, torsional stiffness needs to be aggregated to the section


:{| style="margin:0; background:none; border:3px solid #ccc"  
 
 
{| style="margin:0; background:none;"  
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|-
| style="margin:0; width:25%; border:3px solid #ccc; background:#white; vertical-align:top; " |
| style="color:#000;" | <div>
{| style="width:100%; vertical-align:top;background:#white;"
<h4>Uniaxial Section</h4>
<h4>Uniaxial Section</h4>
[[File:ExampleFigure_FiberSection_W.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
----
----
|-
| style="color:#000;" |
[[File:ExampleFigure_FiberSection_W.GIF|link=OpenSees Example 8. generic 3D Frame, NStory NBayX NBayZ, Reinforced-Concrete Section & Steel W-Section]]
|}
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| style="margin:0; width:25%; border:3px solid #ccc; background:#white; vertical-align:top; " |
{| style="width:100%; vertical-align:top;background:#white;"
<strong>Files</strong>
<strong>Files</strong>
*[[Media:Ex9a.build.UniaxialSection2D.tcl|Ex9a.build.UniaxialSection2D.tcl]]
*[[Media:Ex9a.build.UniaxialSection2D.tcl|Ex9a.build.UniaxialSection2D.tcl]]
*[[Media:Ex9a.build.UniaxialSection3D.tcl|x9a.build.UniaxialSection3D.tcl]]
*[[Media:Ex9a.build.UniaxialSection3D.tcl|Ex9a.build.UniaxialSection3D.tcl]]
*[[Media:LibUnits.tcl|LibUnits.tcl]]
*[[Media:LibUnits.tcl|LibUnits.tcl]]
----
|}
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| style="margin:0; width:25%; border:3px solid #ccc; background:#white; vertical-align:top; " |
{| style="width:100%; vertical-align:top;background:#white;"
<strong>Notes</strong>
<strong>Notes</strong>
*Flexure and axial behavior are uncoupled in this type of section
*Flexure and axial behavior are uncoupled in this type of section
</div>
|}
|}
|}




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{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
|-
|-
| style="color:#000;" | <div>
| style="color:#000;" |  
<h5>Static Pushover</h5>
<h5>Static Pushover</h5>
[[File:ExampleFigure_Push.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
[[File:ExampleFigure_Push.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
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<strong>Notes</strong>
<strong>Notes</strong>
*One-directional monotonic displacement-controlled static loading
*One-directional monotonic displacement-controlled static loading
</div>
 
|}
|}
----
----
{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
|-
|-
| style="color:#000;" | <div>
| style="color:#000;" |  
<h5>Static Reversed Cyclic</h5>
<h5>Static Reversed Cyclic</h5>
[[File:ExampleFigure_Cyclic.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
[[File:ExampleFigure_Cyclic.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
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*One-directional displacement-controlled static loading
*One-directional displacement-controlled static loading
*Displacement cycles are imposed in positive and negative direction
*Displacement cycles are imposed in positive and negative direction
</div>
 
|}
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{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
|-
|-
| style="color:#000;" | <div>
| style="color:#000;" |  
<h5>Dynamic Uniform Sine-Wave Ground Motion</h5>
<h5>Dynamic Uniform Sine-Wave Ground Motion</h5>
[[File:ExampleFigure_UniformSine.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
[[File:ExampleFigure_UniformSine.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
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*Sine-wave acceleration input
*Sine-wave acceleration input
*Same acceleration input at all nodes restrained in specified direction
*Same acceleration input at all nodes restrained in specified direction
</div>
 
|}
|}
----
----
{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
|-
|-
| style="color:#000;" | <div>
| style="color:#000;" |  
<h5>Dynamic Uniform Earthquake Ground Motion (typical)</h5>
<h5>Dynamic Uniform Earthquake Ground Motion (typical)</h5>
[[File:ExampleFigure_UniformEQ.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
[[File:ExampleFigure_UniformEQ.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
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*Earthquake (from file) acceleration input
*Earthquake (from file) acceleration input
*Same acceleration input at all nodes restrained in specified direction
*Same acceleration input at all nodes restrained in specified direction
</div>
 
|}
|}
----
----
{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
|-
|-
| style="color:#000;" | <div>
| style="color:#000;" |  
<h5>Dynamic Multiple-Support Sine-Wave Ground Motion</h5>
<h5>Dynamic Multiple-Support Sine-Wave Ground Motion</h5>
[[File:ExampleFigure_MultiSupportSine.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
[[File:ExampleFigure_MultiSupportSine.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
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*Sine-wave displacement input
*Sine-wave displacement input
*Different displacements are specified at particular nodes in specified directions
*Different displacements are specified at particular nodes in specified directions
</div>
 
|}
|}
----
----
{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
|-
|-
| style="color:#000;" | <div>
| style="color:#000;" |  
<h5>Dynamic Multiple-Support Earthquake Ground Motion</h5>
<h5>Dynamic Multiple-Support Earthquake Ground Motion</h5>
[[File:ExampleFigure_MultiSupportEQ.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
[[File:ExampleFigure_MultiSupportEQ.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
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*Earthquake (from file) displacement input
*Earthquake (from file) displacement input
*Different displacements are specified at particular nodes in specified directions  
*Different displacements are specified at particular nodes in specified directions  
</div>
 
|}
|}
----
----
{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
{| style="width:100%; border:1px solid #ddcef2; vertical-align:top;background:#white;"
|-
|-
| style="color:#000;" | <div>
| style="color:#000;" |  
<h5>Dynamic Bidirectional Earthquake Ground Motion (typical)</h5>
<h5>Dynamic Bidirectional Earthquake Ground Motion (typical)</h5>
[[File:ExampleFigure_BidirectEQ.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
[[File:ExampleFigure_BidirectEQ.GIF|link=OpenSees Example 9. Build & Analyze a Section Example]]
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*Different ground motion in two directions
*Different ground motion in two directions
*Same acceleration input at all nodes restrained in specified direction
*Same acceleration input at all nodes restrained in specified direction
</div>
 
|}
|}


Revision as of 22:08, 11 November 2009

Introduction

For the case of the uniaxial section, moment-curvature and axial force-deformation curves are defined independently, and numerically.

For the case of the fiber sections (steel and RC), uniaxial materials are defined numerically (stress-strain relationship) and are combined into a fiber section where moment-curvature and axial force-deformation characteristics and their interaction are calculated computationally.



Input

Model Building

2D vs. 3D
While this distinction does not affect the section definition itself, it affects the degree-of-freedom associated with moment and curvature in the subsequent analysis.
There are two differences between the two models:
1. The space defined with the model command (# Define the model builder, ndm=#dimension, ndf=#dofs)
2D
model BasicBuilder -ndm 2 -ndf 3;
3D
model BasicBuilder -ndm 3 -ndf 6;
2. In the 3D model, torsional stiffness needs to be aggregated to the section


Uniaxial Section

 Files
 Notes
  • Flexure and axial behavior are uncoupled in this type of section



Lateral-Load Analysis

The following tasks are performed in the analysis

  • define lateral-load parameters
  • analyze

Static

Static Pushover

Files

Notes

  • One-directional monotonic displacement-controlled static loading
Static Reversed Cyclic

Files

Notes

  • One-directional displacement-controlled static loading
  • Displacement cycles are imposed in positive and negative direction

Dynamic EQ Ground Motion

Dynamic Uniform Sine-Wave Ground Motion

Files

Notes

  • Sine-wave acceleration input
  • Same acceleration input at all nodes restrained in specified direction
Dynamic Uniform Earthquake Ground Motion (typical)

Files

Notes

  • Earthquake (from file) acceleration input
  • Same acceleration input at all nodes restrained in specified direction
Dynamic Multiple-Support Sine-Wave Ground Motion

Files

Notes

  • Sine-wave displacement input
  • Different displacements are specified at particular nodes in specified directions
Dynamic Multiple-Support Earthquake Ground Motion

Files

Notes

  • Earthquake (from file) displacement input
  • Different displacements are specified at particular nodes in specified directions
Dynamic Bidirectional Earthquake Ground Motion (typical)

Files

Notes

  • Earthquake (from file) acceleration input
  • Different ground motion in two directions
  • Same acceleration input at all nodes restrained in specified direction

Run

The model and analysis combinations for this example are numerous. The following are an small subset, for demonstration purposes:

  • To run W-Section Model, Static Pushover Analysis:
puts " -------------Elastic Model -------------"
puts " -------------Static Pushover Analysis -------------"
source Ex8.genericFrame3D.build.Wsec.tcl
source Ex8.genericFrame3D.analyze.Static.Push.tcl
  • To run RC Model, Uniform Earthquake Excitation
puts " -------------Uniaxial Inelastic Section, Nonlinear Model -------------"
puts " -------------Uniform Earthquake Excitation -------------"
source Ex8.genericFrame3D.build.RCsec.tcl
source Ex8.genericFrame3D.analyze.Dynamic.EQ.Uniform.tcl

Notes

In this example, the following items are variables:

  • Number of stories in Y direction
  • Number of bays in X direction
  • Number of bays in Z direction
  • Elastic/Fiber Section
  • Display: none/node numbering/deformed shape/mode shape (can choose which mode) (variable display scaling factor for both the deformed shape and the mode shape, this scaling factor is dependent on the user choice)


Return to OpenSees Examples Manual -- Structural Models & Analyses

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