Title page for ETD etd-254122839711171

Type of Document Dissertation
Author Velasco, Cesar A. Morales
Author's Email Address cvelasco@vt.edu
URN etd-254122839711171
Title Substructure Synthesis Analysis and Hybrid Control Design for Buildings under Seismic Excitation
Degree PhD
Department Engineering Science and Mechanics
Advisory Committee
Advisor Name Title
Heller, Robert E.
Singh, Mahendra P.
Thangjitham, Surot
VanLandingham, Hugh F.
Meirovitch, Leonard Committee Chair
  • substructure synthesis
  • base isolation
  • structural control
  • hybrid control
  • earthquake engineering
Date of Defense 1997-04-18
Availability unrestricted
We extend the application of the substructure synthesis method to more complex

structures, and establish a design methodology for base isolation and active

control in a distributed model of a building under seismic excitation. Our

objective is to show that passive and active control complement each other in

such an advantageous manner for the case at hand, that simple devices for both

types of control are sufficient to achieve excellent response characteristics with

very low control forces.

The Rayleigh-Ritz based substructure synthesis method proved to be highly

successful in analyzing a structure more complex than the ones previously

analyzed with it. Comparing the responses of the hybridly controlled building

and the conventional fixed building under El Centro excitation, we conclude that

the stresses are reduced by 99.6 %, the base displacement is reduced by 91.7 %

and the required control force to achieve this is 1.1 % of the building weight.

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