OpenSees Example 9. Build & Analyze a Section Example: Difference between revisions
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{| style="width:100%; vertical-align:top;background:#white;" | {| style="width:100%; vertical-align:top;background:#white;" | ||
<strong>Files</strong> | <strong>Files</strong> | ||
*[[Media:Ex9c.build.RectUnconfinedSymm2D.tcl|Ex9c.build.RectUnconfinedSymm2D.tcl]] | *[[Media:Ex9c.build.RCSection.RectUnconfinedSymm2D.tcl|Ex9c.build.RCSection.RectUnconfinedSymm2D.tcl]] | ||
*[[Media:Ex9c.build.RectUnconfinedSymm3D.tcl|Ex9c.RectUnconfinedSymm3D | *[[Media:Ex9c.build.RCSection.RectUnconfinedSymm3D.tcl|Ex9c.build.RCSection.RectUnconfinedSymm3D.tcl]] | ||
*[[Media:LibUnits.tcl|LibUnits.tcl]] | *[[Media:LibUnits.tcl|LibUnits.tcl]] | ||
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<strong>Files</strong> | <strong>Files</strong> | ||
*[[Media:Ex9d.build.RectUnconfinedSymm2D.tcl|Ex9d.build.RectUnconfinedSymm2D.tcl]] | *[[Media:Ex9d.build.RCSection.RectUnconfinedSymm2D.tcl|Ex9d.build.RCSection.RectUnconfinedSymm2D.tcl]] | ||
*[[Media:Ex9d.build.RectUnconfinedSymm3D.tcl|Ex9d.build.RectUnconfinedSymm3D.tcl]] | *[[Media:Ex9d.build.RCSection.RectUnconfinedSymm3D.tcl|Ex9d.build.RCSection.RectUnconfinedSymm3D.tcl]] | ||
*[[Media:LibUnits.tcl|LibUnits.tcl]] | *[[Media:LibUnits.tcl|LibUnits.tcl]] | ||
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*[[Media:Ex9e.build.Rect2D.tcl|Ex9e.build.Rect2D.tcl]] | *[[Media:Ex9e.build.RCSection.Rect2D.tcl|Ex9e.build.RCSection.Rect2D.tcl]] | ||
*[[Media:Ex9e.build.Rect3D.tcl|Ex9e.build.Rect3D.tcl]] | *[[Media:Ex9e.build.RCSection.Rect3D.tcl|Ex9e.build.RCSection.Rect3D.tcl]] | ||
*[[Media:LibUnits.tcl|LibUnits.tcl]] | *[[Media:LibUnits.tcl|LibUnits.tcl]] | ||
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*[[Media:Ex9f.build.Circ2D.tcl|Ex9f.build.Circ2D.tcl]] | *[[Media:Ex9f.build.RCSection.Circ2D.tcl|Ex9f.build.RCSection.Circ2D.tcl]] | ||
*[[Media:Ex9f.build.Circ3D.tcl|Ex9f.build.Circ3D.tcl]] | *[[Media:Ex9f.build.RCSection.Circ3D.tcl|Ex9f.build.RCSection.Circ3D.tcl]] | ||
*[[Media:LibUnits.tcl|LibUnits.tcl]] | *[[Media:LibUnits.tcl|LibUnits.tcl]] | ||
|} | |} |
Revision as of 23:09, 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
- 1. The space defined with the model command (# Define the model builder, ndm=#dimension, ndf=#dofs)
Uniaxial Section |
Files |
Notes
|
Fiber Section: AISC Standard W Section |
Files |
Notes
|
Fiber Section: Reinforced Concrete Section -- Rectangular Symmetric Section, Unconfined Concrete |
Files
|
Notes
|
Fiber Section: Reinforced Concrete Section -- Rectangular Symmetric Section, Confined Concrete Core |
Files
|
Notes
|
Fiber Section: Reinforced Concrete Section -- Rectangular Section |
Files |
Notes
|
Fiber Section: Reinforced Concrete Section -- Circular Section, Confined Core |
Files |
Notes
|
Moment-Curvature Analysis
- This example introduces the moment-curvature procedures for sections in 2D or 3D space, as built in the previous section. (the only difference between them is the degree-of-freedom corresponding to curvature).
- The moment-curvature analysis of a section is by creating a zero-length rotational-spring element. This section is subjected to a user-defined constant axial load and to a linearly-increasing moment to a user-defined maximum curvature.
2D Moment-Curvature Analysis |
Files |
Notes |
3D Moment-Curvature Analysis |
Files |
Notes |
Run
The model and analysis combinations for this example are numerous. The following are an small subset, for demonstration purposes:
- To run Uniaxial-Section Model, 2D
puts " --------------------------------- 2D Model ---------------" puts " a. Uniaxial Section" source Ex9a.build.UniaxialSection2D.tcl source Ex9.analyze.MomentCurvature2D.tcl
- To run RC Section: Rectangular, Confined, Symmetric Model, 3D
puts " --------------------------------- 3D Model ---------------" puts " d. RC Section: Rectangular, Confined, Symmetric" source Ex9d.build.RCSection.RectConfinedSymm3D.tcl source Ex9.analyze.MomentCurvature3D.tcl
Notes
Return to OpenSees Examples Manual -- Structural Models & Analyses
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