Structural Damping: Applications in Seismic Response Modification

Zach Liang, George C. Lee, Gary F. Dargush, Jianwei Song

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November 21, 2011 by CRC Press
Reference - 581 Pages - 136 B/W Illustrations
ISBN 9781439815830 - CAT# KE10744
Series: Advances in Earthquake Engineering

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Features

  • Presents self-contained design principles of structural damping
  • Examines cost-effective ways to limit seismic-induced structural damages
  • Illustrates limitations of the current design practice for large damping systems and how to improve them to handle enhanced damping
  • Integrates recent theories and techniques for damping design, including models based on generally damped MDOF systems instead of proportional damping
  • Explains the damping mechanisms, reasons, and working ranges for vibration reductions
  • Suggests code compatible (NEHRP 2009) formula and procedure for linearized damping design by using truncated modal superposition in reduced dimensional space instead of full state space
  • Suggests nonlinear damping design procedures to include effects of practical installation issues

Summary

Rapid advances have been made during the past few decades in earthquake response modification technologies for structures, most notably in base isolation and energy dissipation systems. Many practical applications of various dampers can be found worldwide and, in the United States, damper design has been included in building codes. The current design process is simple and useful for adding supplemental damping up to a reasonable level—but it is not as useful with higher levels of damping.

Taking a different approach, Structural Damping: Applications in Seismic Response Modification considers the dynamic responses of structures with added damping devices as systems governed by the combined effect of the static stiffness, period, and damping—or "dynamic stiffness"—of the structure-device system. This formulation supplies additional information for higher-level supplemental damping design that current provisions may not adequately cover. The authors also propose a more comprehensive consideration of the core issues in structural damping, which provides a useful foundation for continued research and development in seismic response modification technologies for performance-based engineering.

The book includes design examples, based on the authors’ research and practical experience, to illustrate approaches that include higher-level supplemental damping to complement the use of the current NEHRP/ASCE-7 provisions. A self-contained resource on damping design principles, this book helps earthquake engineers select the most effective type of damper and determine the amount and configuration of damping under given working conditions.