OpenSees Example 4. Portal Frame: Difference between revisions

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<strong>Files</strong>
<strong>Files</strong>
*[[Media:Ex4.Portal2d.analyze.Dynamic.sine.Uniform.tcl|Ex4.Portal2d.analyze.Dynamic.sine.Uniform.tcl]]
*[[Media:Ex4.Portal2D.analyze.Dynamic.sine.multipleSupport.tcl|Ex4.Portal2D.analyze.Dynamic.sine.multipleSupport.tcl]]
*[[Media:LibAnalysisDynamicParameters.tcl|LibAnalysisDynamicParameters.tcl]]
*[[Media:LibAnalysisDynamicParameters.tcl|LibAnalysisDynamicParameters.tcl]]
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<strong>Files</strong>
<strong>Files</strong>
*[[Media:Ex4.Portal2D.analyze.Dynamic.EQ.bidirect.tcl|x4.Portal2D.analyze.Dynamic.EQ.bidirect.tcl]]
*[[Media:Ex4.Portal2D.analyze.Dynamic.EQ.bidirect.tcl|Ex4.Portal2D.analyze.Dynamic.EQ.bidirect.tcl]]
*[[Media:LibAnalysisDynamicParameters.tcl|LibAnalysisDynamicParameters.tcl]]
*[[Media:LibAnalysisDynamicParameters.tcl|LibAnalysisDynamicParameters.tcl]]
*[[Media:ReadSMDfile.tcl|ReadSMDfile.tcl]] (need to modify ReadSMDfile.tcl for displacement data)
*[[Media:ReadSMDfile.tcl|ReadSMDfile.tcl]] (need to modify ReadSMDfile.tcl for displacement data)
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==Run==
==Run==
The following combinations of model-building and analysis can be performed with this example:
The model and analysis combinations for this example are numerous. The following are an small subset, for demonstration purposes:


* To run Elastic Mode, Static Pushover Analysis:
* To run Elastic Mode, Static Pushover Analysis:
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puts " -------------Elastic Model -------------"
puts " -------------Elastic Model -------------"
puts " -------------Static Pushover Analysis -------------"
puts " -------------Static Pushover Analysis -------------"
source Ex3.Canti2D.build.ElasticElement.tcl
source Ex4.Portal2D.build.ElasticElement.tcl
source Ex3.Canti2D.analyze.Static.Push.tcl
source Ex4.Portal2D.analyze.Static.Push.tcl  
</source></blockquote>
 
* To run Elastic Mode, Uniform Earthquake Excitation:
<blockquote><source lang="Tcl">
puts " -------------Elastic Model -------------"
puts " -------------Uniform Earthquake Excitation -------------"
source Ex3.Canti2D.build.ElasticElement.tcl
source Ex3.Canti2D.analyze.Dynamic.EQ.Uniform.tcl
</source></blockquote>
 
* To run Uniaxial Inelastic Section, Nonlinear Model, Static Pushover Analysis
<blockquote><source lang="Tcl">
puts " -------------Uniaxial Inelastic Section, Nonlinear Model -------------"
puts " -------------Static Pushover Analysis -------------"
source Ex3.Canti2D.build.InelasticSection.tcl
source Ex3.Canti2D.analyze.Static.Push.tcl
</source></blockquote>
</source></blockquote>


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puts " -------------Uniaxial Inelastic Section, Nonlinear Model -------------"
puts " -------------Uniaxial Inelastic Section, Nonlinear Model -------------"
puts " -------------Uniform Earthquake Excitation -------------"
puts " -------------Uniform Earthquake Excitation -------------"
source Ex3.Canti2D.build.InelasticSection.tcl
source Ex4.Portal2D.build.InelasticSection.tcl  
source Ex3.Canti2D.analyze.Dynamic.EQ.Uniform.tcl
source Ex4.Portal2D.analyze.Dynamic.EQ.Uniform.tcl  
</source></blockquote>
</source></blockquote>


* To run Uniaxial Inelastic Material, Fiber Section, Nonlinear Mode, Static Pushover Analysis
* To run Uniaxial Inelastic Material, Fiber Section, Nonlinear Mode, Dynamic Bidirectional Earthquake Ground Motion
<blockquote><source lang="Tcl">
<blockquote><source lang="Tcl">
puts " -------------Uniaxial Inelastic Material, Fiber Section, Nonlinear Model -------------"
puts " -------------Uniaxial Inelastic Material, Fiber Section, Nonlinear Model -------------"
puts " -------------Static Pushover Analysis -------------"
puts " -------------Static Pushover Analysis -------------"
source Ex3.Canti2D.build.InelasticFiberSection.tcl
source Ex4.Portal2D.build.InelasticFiberSection.tcl
source Ex3.Canti2D.analyze.Static.Push.tcl
source Ex4.Portal2D.analyze.Dynamic.EQ.bidirect.tcl
</source></blockquote>
 
* To run Uniaxial Inelastic Material, Fiber Section, Nonlinear Mode, Uniform Earthquake Excitation
<blockquote><source lang="Tcl">
puts " -------------Uniaxial Inelastic Material, Fiber Section, Nonlinear Model -------------"
puts " -------------Uniform Earthquake Excitation -------------"
source Ex3.Canti2D.build.InelasticFiberSection.tcl
source Ex3.Canti2D.analyze.Dynamic.EQ.Uniform.tcl
</source></blockquote>
</source></blockquote>




==Notes==
==Notes==
*This example is the first to follow most of the recommended techniques in building an input file:
*Model and analysis parameters are defined as variables
*The basic units, used to define Force, Length and Time need to be independent.
*Units need to be used consistently throughout the input file, otherwise some arguments will not scale properly
*The model-building files and the analysis files are separated. The same analysis file can be used on different model-building files (elastic or inelastic elements).
*This example does not, however, take advantage of previously-defined Tcl procedures and scripts, as will Example 4.
*In OpenSees/Tcl, units are simply defined as variables that become scaling factors. This technique allows the user to input variables with different types of units, not just the ones chosen for output. For example, section widths can be defined in inches, while element length can be defined in feet.
<blockquote>For example, with the following commands used in setting some of the units:
<blockquote><source lang="Tcl">
set in 1.; # define basic units -- output units
set kip 1.; # define basic units -- output units
set sec 1.; # define basic units -- output units
# -------
set ft [expr 12.*$in]; # define engineering units
set ksi [expr $kip/pow($in,2)];
</source></blockquote>
When the user says:
<blockquote><source lang="Tcl">
set HCol [expr 3*$in];
set LCol [expr 30*$ft];
</source></blockquote>
Tcl multiplies 30 by 12 to give the column length in inches. By scaling the input, all input processed by OpenSees is in the basic units, as is the output.
</blockquote>




Revision as of 19:48, 11 November 2009

Introduction

This is a great example! To all the demonstrations that Example 3 has done, Example 4 adds the use of previously-defined Tcl procedures (a procedure is a Tcl command that is created by the proc command) or scripts. This example also introduces new kinds of static and dynamic analyses.


Input

Model Building

The following tasks are performed when building the model

  • define units
  • define model
  • define recorders for output
  • define & apply gravity

Elastic Element

Files

Notes

  • Effective axial and flexural stiffnesses are defined at the element level
  • elasticBeamColumn elements

Distributed Plasticity Element, Uniaxial Section

Files

Notes

  • Axial and flexural stiffnesses/strength are defined independently at the section level
  • uniaxial inelastic section (moment-curvature)
  • nonlinear beam-column elements

Distributed Plasticity Element, Fiber Section

Files

Notes

  • The section is broken down into fibers where uniaxial materials are defined independently.
  • The program calculates flexural and axial stiffnesses/strength by integrating strains across the section.
  • fiber section
  • nonlinear beam-column elements


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 Elastic Mode, Static Pushover Analysis:
puts " -------------Elastic Model -------------"
puts " -------------Static Pushover Analysis -------------"
source Ex4.Portal2D.build.ElasticElement.tcl
source Ex4.Portal2D.analyze.Static.Push.tcl
  • To run Uniaxial Inelastic Section, Nonlinear Model, Uniform Earthquake Excitation
puts " -------------Uniaxial Inelastic Section, Nonlinear Model -------------"
puts " -------------Uniform Earthquake Excitation -------------"
source Ex4.Portal2D.build.InelasticSection.tcl 
source Ex4.Portal2D.analyze.Dynamic.EQ.Uniform.tcl
  • To run Uniaxial Inelastic Material, Fiber Section, Nonlinear Mode, Dynamic Bidirectional Earthquake Ground Motion
puts " -------------Uniaxial Inelastic Material, Fiber Section, Nonlinear Model -------------"
puts " -------------Static Pushover Analysis -------------"
source Ex4.Portal2D.build.InelasticFiberSection.tcl
source Ex4.Portal2D.analyze.Dynamic.EQ.bidirect.tcl


Notes

Return to OpenSees Examples Manual

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