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Structural Damping

Applications in Seismic Response Modification

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

CRC Press – 2012 – 581 pages

Series: Advances in Earthquake Engineering

Purchasing Options:

  • Add to CartHardback: $146.95
    978-1-43-981582-3
    November 21st 2011

Description

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.

Contents

VIBRATION SYSTEMS

Free and Harmonic Vibration of Single-Degree-of-Freedom Systems

Model of Linear SDOF Vibration Systems

Dynamic Magnification

Energy Dissipation and Effective Damping

Linear Single-Degree-of-Freedom Systems with Arbitrary Excitations

Periodic Excitations

Transient Excitations

Random Excitations

Earthquake Responses of SDOF Linear Systems

Linear Proportionally Damped Multi-Degree-of-Freedom Systems

Undamped MDOF Systems

Proportionally Damped MDOF Systems

Modal Participation and Truncation

Base Shear and Lateral Force

Natural Frequency and Mode Shape Estimation

Coefficient Matrix for Proportional Damping

Multi-Degree-of-Freedom Systems with General Damping

State Equation and Conventional Treatment

Damper Design for Nonproportionally Damped Systems

Overdamped Subsystems

Responses of Generally Damped Systems and the Design Spectra

Modal Participations and Modal Criteria

PRINCIPLES AND GUIDELINES FOR DAMPING CONTROL

Principles of Damper Design

Modeling of Damping

Rectangular Law, Maximum Energy Dissipation per Device

Damping Adaptability

Design and Control Parameters

Damping Force-Related Issues

System Nonlinearity and Damping of Irregular Structures

Nonlinear Systems

Irregular MDOF System

Minimizing Damping Nonproportionality

Role of Damping in Nonlinear Systems

DESIGN OF SUPPLEMENTAL DAMPING

Linear Damping Design

Overview of Design Approaches

MSSP Systems Simplified Approach

Proportionally Damped MDOF Systems Approach

Design of Generally Damped Systems

Damper Design Issues

Damper Design Codes

Brief Summary of Damping Design of Linear Systems

Nonlinear Damping

Overview of Design Approaches

Equivalent Linear Systems Approach with Bilinear Dampers

Equivalent Linear Systems Approach with Sublinear Dampers

Nonlinear Response Spectra Approach with Sublinear Dampers

Nonlinear Response Spectra Approach with Bilinear Dampers

Index

Chapters include a summary and references.

Author Bio

Dr. Zach Liang is a research professor in the Department of Mechanical and Aerospace Engineering at the State University of New York at Buffalo.

Dr. George C. Lee is a SUNY Distinguished Professor in the Department of Civil, Structural and Environmental Engineering at the State University of New York at Buffalo.

Dr. Gary F. Dargush is Professor and Chair of the Department of Mechanical and Aerospace Engineering (MAE) at the State University of New York at Buffalo.

Dr. Jianwei Song is a senior research scientist in the Multidisciplinary Center for Earthquake Engineering Research in the Department of Civil, Structural and Environmental Engineering at the State University of New York at Buffalo.

Name: Structural Damping: Applications in Seismic Response Modification (Hardback)CRC Press 
Description: By Zach Liang, George C. Lee, Gary F. Dargush, Jianwei Song. 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...
Categories: Structural Engineering, Georisk & Hazards