Dynamic Response of Steel MomentFrame Structures with Hybrid Passive Control Systems

1
Dynamic Response of Steel Moment-Frame Structures
with Hybrid Passive Control Systems

• Justin D. Marshall, Ph.D., P.E.
• Auburn University
• Finley A. Charney, Ph.D., P.E.
• Virginia Tech

2
Overview

• Introduction
• Hybrid Passive Control Systems
• Model Description Analysis Plan
• Analysis Results
• Conclusions
• Future Directions

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Introduction

• Methods of Seismic Protection
• Conventional Systems
• Moment Resisting Frame
• Braced Frame (Concentric, Eccentric, Buckling
  Restrained)
• Shear Wall
• Base Isolation
• Passive Control Devices
• Viscous Fluid
• Viscoelastic
• Hysteretic
• Friction

4
Introduction

• Key Concepts
• Effective seismic protective systems require a
  balance between strength, stiffness and energy
  dissipation.
• Reliable infrastructure results from a seismic
  protective system designed within a
  performance-based framework.

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Hybrid Passive Control Systems

• Characteristics
• Multi-phase behavior
• Phase 1 Damping for wind and minor seismic
  events
• Phase 2 Significant energy dissipation for major
  events
• Combination of velocity-dependent and
  displacement-dependent energy dissipation
• Possess hyperelastic or stiffening effect

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Hybrid Passive Control System

• Benefits
• Energy dissipation for all magnitudes of
  excitation
• Phase transition allows system to meet
  performance-based design requirements
• Hyperelastic response beneficial in overcoming
  dynamic instability
• Change in stiffness at phase transition reduces
  resonant build-up

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Hybrid Passive Control Systems
Visco-Plastic Device
Visco-Hyperelastic Device
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Hybrid Passive Control Systems
Hybrid Passive Control Device
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Analysis Plan Conceptual Study

• Non-linear dynamic analysis of 9-story structure
  (SAC Steel Project)
• Incremental Dynamic Analysis with scaled
  earthquake acceleration records
• Comparison of conventional and hybrid lateral
  resisting systems
• Damage measures roof drift, base shear and total
  acceleration
• Includes response history and static pushover

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Model Description
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Lateral Resisting Systems
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Model Description
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Model Description
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Analysis Results - IDA
Hybrid Passive Systems with High-Damping Rubber
Dampers
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Analysis Results - IDA
Hybrid Passive Systems with Viscous Fluid Dampers
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Analysis Results Response History
Difference in Response History of Conventional
and Hybrid Passive Systems - Base shear
magnitude equivalent - Reduction in number of
cycles
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Analysis Results - IDA
Effect of Initial Gap Size on response HDRD
Hybrid Systems
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Analysis Results - IDA
Effect of Initial Gap Size on response VFD
Hybrid Systems
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Analysis Results Static Pushover
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Conclusions

• Hybrid Passive Control Systems demonstrated
  potential as a performance-based passive control
  system
• Supplemental damping in the initial phase reduced
  the number of cycles late in the earthquake
• many parameters enable system to satisfy multiple
  performance requirements
• The various hybrid systems analyzed require
  further refinement, analysis and testing

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Future Directions

• Single Degree of Freedom Parametric Study
• Expanded Multiple Degree of Freedom Study
• Development of Performance-Based Design
  Guidelines
• Innovative and Practical System Configurations
• Large-scale Component and System Testing

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Acknowledgements

• National Science Foundation
• Virginia Tech ASPIRES Program
• Charles E. Via Endowment