Title page for ETD etd-03242003-155023


Type of Document Master's Thesis
Author Oesterle, Michael Gerhardt
Author's Email Address moesterl@vt.edu
URN etd-03242003-155023
Title Use of Incremental Dynamic Analysis to Assess the Performance of Steel Moment-Resisting Frames with Fluid Viscous Dampers
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Charney, Finley A. Committee Chair
Murray, Thomas M. Committee Member
Plaut, Raymond H. Committee Member
Keywords
  • Fluid Viscous Damping
  • Incremental Dynamic Analysis
  • Near-Field Earthquakes
  • Residual Displacements
Date of Defense 2003-03-17
Availability unrestricted
Abstract
This thesis presents the results of a study that uses Incremental Dynamic Analysis to assess the seismic performance of steel moment-resisting frames with fluid viscous dampers subjected to earthquake ground motions. The study systematically investigated the effects of linear and nonlinear dampers on the response of steel moment-resisting frames to earthquakes that varied in intensity and type. Both near-field and far-field motions were considered. Two different types of nonlinear dampers were investigated; one had a hardening and the other had a softening force-velocity relationship. The nonlinear dampers were calibrated to the linear dampers so that there was a basis of comparison. Maximum damper displacement is one of the parameters of the calibration, and it was varied to investigate its effect on structural response. Several nonlinear inelastic time history analyses were performed to obtain responses, such as peak base shear, peak interstory drift, or residual displacement index, which were plotted versus earthquake intensity to create individual IDA curves. Sets of related IDA curves provide a useful summary of the structural behavior for a wide range of variables. IDA curves for the tests with different damping types are presented. The results show that for both near-field and far-field ground motions the nonlinear dampers with a hardening force-velocity relationship are best suited to reduce undesirable drifts and residual displacements; however, these reductions come at the cost of high base shear forces.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  AppendixA-VerificationofPerform.pdf 319.80 Kb 00:01:28 00:00:45 00:00:39 00:00:19 00:00:01
  AppendixB-IDAPlots.pdf 1.72 Mb 00:07:58 00:04:06 00:03:35 00:01:47 00:00:09
  Chapter1-Introduction.pdf 107.35 Kb 00:00:29 00:00:15 00:00:13 00:00:06 < 00:00:01
  Chapter2-Background.pdf 303.39 Kb 00:01:24 00:00:43 00:00:37 00:00:18 00:00:01
  Chapter3-ModelsandProcedures.pdf 614.73 Kb 00:02:50 00:01:27 00:01:16 00:00:38 00:00:03
  Chapter4-ResultsandDiscussion.pdf 745.65 Kb 00:03:27 00:01:46 00:01:33 00:00:46 00:00:03
  Chapter5-Conclusions.pdf 152.33 Kb 00:00:42 00:00:21 00:00:19 00:00:09 < 00:00:01
  FrontMatter.pdf 162.59 Kb 00:00:45 00:00:23 00:00:20 00:00:10 < 00:00:01
  References.pdf 109.88 Kb 00:00:30 00:00:15 00:00:13 00:00:06 < 00:00:01

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