Introduction
- Just like Example 6 for the 2D frame, this example utilizes Tcl variable-substitution and array-management tools to optimize the building of the numerical model of a generic 3D frame.
- The user is prompted for the number of stories and the number of bays (the can also be fixed in the input file).
- The same items for 3D modelling as the frame shown in Example 7 are considered here.
- For this example, there is one model-building file with many options for the model. In addition to specific dynamic-analysis files, there is also a dynamic-analysis file where the user is given the option of which dynamic analysis to perform.
Input
Model Building
- The following tasks are performed when building the model
- define units
- define model
- define recorders for output
- define & apply gravity
- The only difference between the two input files is in modelling the element section properties and calculating beam and column weight/mass.
Steel W Section
Files
Notes
- 3D building frame: Steel W sections for both columns and beams. (variable elastic or fiber section)
- As of OpenSees version 3.2.2, you need to define torsion for the 3D fiber sections (https://wp.me/pbejzW-9X)
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RC Section
Files
Notes
- 3D building frame: Reinforced-concrete rectangular sections for both columns and beams. (variable elastic or fiber section)
- As of OpenSees version 3.2.2, you need to define torsion for the 3D fiber sections (https://wp.me/pbejzW-9X)
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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
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Static Reversed Cyclic
Files
Notes
- One-directional displacement-controlled static loading
- Displacement cycles are imposed in positive and negative direction
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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
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Dynamic Uniform Earthquake Ground Motion (typical)
Files
Notes
- Earthquake (from file) acceleration input
- Same acceleration input at all nodes restrained in specified direction
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Dynamic Multiple-Support Sine-Wave Ground Motion
Files
Notes
- Sine-wave displacement input
- Different displacements are specified at particular nodes in specified directions
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Dynamic Multiple-Support Earthquake Ground Motion
Files
Notes
- Earthquake (from file) displacement input
- Different displacements are specified at particular nodes in specified directions
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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
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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)
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