DDM-Based Response Sensitivity Computation Tcl Commands:: Difference between revisions

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<!--        INTRODUCTION        -->
<h1>Introduction</h1>
The examples in this manual are listed in order of simplicity.


In OpenSees, an analysis is an object which is composed by the aggregation of component objects. It is the component objects which define the type of analysis that is peformed on the model. The component classes, as shown in the figure below, consist of the following:
NOTE: gravity analysis is always included as part of the model building
#ConstraintHandler -- determines how the constraint equations are enforced in the analysis -- how it handles the boundary conditions/imposed displacements
#DOF_Numberer -- determines the mapping between equation numbers and degrees-of-freedom
#Integrator -- determines the predictive step for time t+dt
#SolutionAlgorithm -- determines the sequence of steps taken to solve the non-linear equation at the current time step
#SystemOfEqn/Solver -- within the solution algorithm, it specifies how to store and solve the system of equations in the analysis
#Convergence Test -- determines when convergence has been achieved.


<!--        MODELS        -->
<h1>Models</h1> 
The following types of models are represented in these examples:
:;<h2>Elastic Elements</h2>
: OpenSees [[Elastic Beam Column Element]]
: The elastic, uncoupled, axial and flexural stiffnesses are defined at the element level
: user specifies: E,I,A
:;<h2>Inelastic Elements</h2>
: OpenSees [[Force-Based Beam-Column Element]]
: Two types of sections
::<h3>Uniaxial Section</h3>
::: The inelastic, uncoupled, axial and flexural stiffnesses are defined at the section level
::: The OpenSees [[Uniaxial Section]] Command is used
::: User specifies:
:::: Axial stiffness A
:::: Section Moment-Curvature characteristics via the OpenSees [[UniaxialMaterial Command]]
::<h3>Fiber Section</h3>
::: The section is broken down into fibers where uniaxial materials are defined independently.
::: The program calculates the coupled flexural and axial stiffnesses/strength by integrating strains across the section
::: The OpenSees [[Fiber Section]] Command is used
::: User specifies
:::: Stress-Strain characteristics via the OpenSees [[UniaxialMaterial Command]] for all number of materials
:::: Section geometry via series of Patches and Layers in the fiber section
::: Two Section Geometries are presented
:::: *RC Rectangular Section
:::: *Standard AISC W section
<!--        LATERAL LOADS        -->
<h1>Lateral Loads</h1> 
The following types of lateral loads are represented in these examples:
[[File:StaticPushoverLoads_Figure1.GIF|link=OpenSees Examples Manual -- Structural Models & Analyses|right]]
:;<h2> Static Pushover</h2>
: Control node is located at the highest floor
: Lateral-load distribution is proportional the the mass distribution along the height of the building
: Static analysis
: Two types
::<h3>Monotonic Pushover</h3>
::: One-directional displacement-controlled static lateral loading
::<h3>Reversed Cyclic Pushover</h3>
::: One-directional displacement-controlled static lateral loading
::: Displacement cycles are imposed in positive and negative direction
[[File:TimeDependent_Figure1.GIF|link=OpenSees Examples Manual -- Structural Models & Analyses|right]]
:;<h2> Time-Dependent Dynamic Loads</h2>
: Transient analysis
: Four types
::<h3>Uniform Sine-Wave</h3>
::: Sine-wave acceleration input
::: Same acceleration input at all nodes restrained in specified direction
::<h3>Multiple-Support Sine-Wave</h3>
::: Sine-wave displacement input
::: Different displacements are specified at particular nodes in specified directions
::<h3>Uniform Earthquake</h3>
::: Earthquake (from file) acceleration input
::: Same acceleration input at all nodes restrained in specified direction
::<h3>Multiple-Support Earthquake</h3>
::: Earthquake (from file) displacement input
::: Different displacements are specified at particular nodes in specified direction
::<h3>Bidirectional Earthquake</h3>
::: Different inputs are specified for two directions
::: Same acceleration input at all nodes restrained in specified direction


The following Analysis commands are added to the interpreter to create the Analysis and perform the analysis:
The following Analysis commands are added to the interpreter to create the Analysis and perform the analysis:

Revision as of 21:20, 9 January 2011

Introduction

The examples in this manual are listed in order of simplicity.

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

Models

The following types of models are represented in these examples:

Elastic Elements

OpenSees Elastic Beam Column Element
The elastic, uncoupled, axial and flexural stiffnesses are defined at the element level
user specifies: E,I,A

Inelastic Elements

OpenSees Force-Based Beam-Column Element
Two types of sections

Uniaxial Section

The inelastic, uncoupled, axial and flexural stiffnesses are defined at the section level
The OpenSees Uniaxial Section Command is used
User specifies:
Axial stiffness A
Section Moment-Curvature characteristics via the OpenSees UniaxialMaterial Command

Fiber Section

The section is broken down into fibers where uniaxial materials are defined independently.
The program calculates the coupled flexural and axial stiffnesses/strength by integrating strains across the section
The OpenSees Fiber Section Command is used
User specifies
Stress-Strain characteristics via the OpenSees UniaxialMaterial Command for all number of materials
Section geometry via series of Patches and Layers in the fiber section
Two Section Geometries are presented
*RC Rectangular Section
*Standard AISC W section

Lateral Loads

The following types of lateral loads are represented in these examples:

Static Pushover

Control node is located at the highest floor
Lateral-load distribution is proportional the the mass distribution along the height of the building
Static analysis
Two types

Monotonic Pushover

One-directional displacement-controlled static lateral loading

Reversed Cyclic Pushover

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

Time-Dependent Dynamic Loads

Transient analysis
Four types

Uniform Sine-Wave

Sine-wave acceleration input
Same acceleration input at all nodes restrained in specified direction

Multiple-Support Sine-Wave

Sine-wave displacement input
Different displacements are specified at particular nodes in specified directions

Uniform Earthquake

Earthquake (from file) acceleration input
Same acceleration input at all nodes restrained in specified direction

Multiple-Support Earthquake

Earthquake (from file) displacement input
Different displacements are specified at particular nodes in specified direction

Bidirectional Earthquake

Different inputs are specified for two directions
Same acceleration input at all nodes restrained in specified direction

The following Analysis commands are added to the interpreter to create the Analysis and perform the analysis:

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