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Objectives and Characteristics
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Model Types
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Analysis Types
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| OpenSees Example 1a. 2D Elastic Cantilever Column
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- overview of basic OpenSees input structure
- coordinates, boundary conditions, element connectivity, nodal masses, nodal loads, etc.
- two-node, one element
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- static pushover analysis
- dynamic earthquake-input analysis
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| OpenSees Example 1b. Elastic Portal Frame
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- two element types
- distributed element loads
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- static pushover analysis
- dynamic earthquake-input analysis
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Objectives and Characteristics
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Model Types
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Analysis Types
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| OpenSees Example 2a. Elastic Cantilever Column with variables
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- introduce variable: define & use
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- static pushover analysis
- dynamic earthquake-input analysis
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| OpenSees Example 2b. Nonlinear Cantilever Column: Uniaxial Inelastic Section
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- first example of nonlinear model, set nonlinearity at section level
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- nonlinearBeamColumn element
- uniaxial section
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- static pushover analysis
- dynamic earthquake-input analysis
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| OpenSees Example 2c. Nonlinear Cantilever Column: Inelastic Uniaxial Materials in Fiber Section
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- set nonlinearity at material level
- material stress-strain response is assembled into fiber section
- reinforced-concrete fiber section
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- nonlinearBeamColumn element
- uniaxial material
- fiber section (Reinforced-concrete fiber section)
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- static pushover analysis
- dynamic earthquake-input analysis
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Objectives and Characteristics
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Model Types
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Analysis Types
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| OpenSees Example 3. 2D RC Cantilever
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- units, defined and used (they will be used in all subsequent examples)
- separate model-building and analysis files
- introduce PDelta effects (or not)
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- elastic elements
- inelastic uniaxial section
- fiber section (Reinforced-concrete fiber section)
- Linear, PDelta or Corotational Transformation
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- static pushover analysis
- dynamic earthquake-input analysis (uniform excitation)
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| OpenSees Example 4. Portal Frame
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- 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)
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- elastic elements
- inelastic uniaxial section
- inelastic fiber section (Reinforced-concrete fiber section)
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- 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)
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| OpenSees Example 5. 2D Frame ? 3-story, 3-bay (RC & W-section)
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- 2D frame of fixed geometry: 3-story, 3-bay
- nodes and elements are defined manually, one by one
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- Reinforced-Concrete Section
- Steel W-Section
- elastic uniaxial section
- inelastic uniaxial section
- inelastic fiber section
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- 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)
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| OpenSees Example 6. Generic 2D Frame: N-story, N-bay (RC & W-section)
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- 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
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- Reinforced-Concrete Section
- Steel W-Section
- elastic uniaxial section
- inelastic uniaxial section
- inelastic fiber section
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- 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)
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Objectives and Characteristics
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Model Types
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Analysis Types
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| OpenSees Example 7. 3D Moment-Resisting Frame (RC & W-section)
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- 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
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- Reinforced-Concrete Section
- Steel W-Section
- Elastic or Fiber Section option is a variable within one input file
- rigid diaphragm
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- 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)
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| OpenSees Example 8. generic 3D Frame ? Nstory, NbayX,NBayZ (RC & W-section)
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- 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
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- Reinforced-Concrete Section
- Steel W-Section
- Elastic or Fiber Section option is a variable within one input file optional rigid diaphragm
- rigid diaphragm
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- 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)
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| OpenSees Example 9. Build a Fiber Section
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- defined section using uniaxial behavior (define moment-curvature curve) or
- define section using uniaxial materials (define stress curve) in fiber section
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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
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- 2D & 3D static unidirectional moment-curvature analysis
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