OpenSees Example 8. generic 3D Frame, NStory NBayX NBayZ, Reinforced-Concrete Section & Steel W-Section: Difference between revisions

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<strong>Notes</strong>
<strong>Notes</strong>
*3D building frame: Reinforced-concrete rectangular sections for both columns and beams. (variable elastic or fiber section)
*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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Revision as of 19:11, 28 August 2020

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)

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)



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 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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