Title page for ETD etd-12092010-163513


Type of Document Dissertation
Author Shin, Hyun
Author's Email Address hyshin@vt.edu
URN etd-12092010-163513
Title Life-Cycle Cost-Based Optimal Seismic Design of Structures with Energy Dissipation Devices
Degree PhD
Department Civil Engineering
Advisory Committee
Advisor Name Title
Plaut, Raymond H. Committee Co-Chair
Singh, Mahendra P. Committee Co-Chair
Charney, Finley A. Committee Member
Kapania, Rabesh K. Committee Member
Roberts-Wollmann, Carin L. Committee Member
Keywords
  • Life-Cycle Cost
  • Structural Optimization
  • Passive Device
Date of Defense 2010-11-16
Availability restricted
Abstract
Seismic designs of building structures are currently made based on the design criterion

of life-safety and this requires that the structures do not collapse to compromise safety

of people in the structure, but they can be designed to experience some damage.

However, this design approach has allowed large economic losses primarily due to the

damage to the nonstructural components at relatively moderate levels of seismic

intensities. This led to a new thinking about design approach called performance-based

design approach that satisfies the life-safety objective at the same time, reduces the

economic loss to an acceptable level. The performance-based design approaches are

multi-level design that addresses several different levels of structural performances

under different levels of seismic intensities. In this study, we have investigated the use

of energy dissipating damping devices to achieve the performance of a building

structure in a desirable manner over all levels of seismic intensity. Since the initial

motivation of performance-based design was reducing economic loss, the life-cycle

cost-based optimization is considered in this study to obtain the optimal designs with

different damping devices. For the optimal design, three types of devices are used in this

study: fluid viscous dampers, solid visco-elastic dampers, and yielding metallic

dampers. The combinations of two different types of dampers are also examined in this

study. The genetic algorithm (GA) approach is adopted as an optimizer that searches for

the optimal solution in an iterative manner. Numerical results from the application of

the optimal design to the selected model building are presented to demonstrate the

iii

applicability of the developed approach and to estimate the effectiveness of the obtained

optimal design with each device. It is shown in the results that the optimal design with

each individual damping devices or the combination of two different types of damping

devices are very effective in reducing the expected failure cost as well as the

displacement response quantities and fragilities. The results also show that the optimal

designs focus relatively more on reducing economic losses for the lower but more

frequent excitation intensities as these intensities contribute most to the failure costs.

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