Cyclic performance of self-centering post-tensioned steel beam-column connections using shape memory alloy energy dissipators
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Chowdhury, Md Arman
issued: 2018-11-26T20:45:42Z
issued: 2018
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Driven by a need to reduce repair costs and downtime in structures following a major earthquake, self-centering (SC) systems have been introduced. Post-tensioned (PT) high strength steel strands have shown promising results in providing the SC capability in steel frames, where the beams are compressed to columns. In this study, the lateral cyclic performance of the SC connections is assessed through finite element analysis. At the beginning, the lateral load-deformation behavior of previously tested experimental specimens is validated with three-dimensional finite element models. The validated models are then modified accordingly to investigate the applicability of other techniques, i.e. stiffened angle connection, or other types of materials, i.e. shape memory alloy (SMA). Through design of experiment methodology, parametric studies in component level, i.e. stiffened angle, are conducted to provide some insight into the effect of different stiffener sizes on the strength and energy dissipation capacity of the connection. Afterward, four different techniques of incorporating SMA in the SC connections are proposed based on extensive parametric studies. Segmented PT connection is possible with shorter length SMA strand which can even sustain higher drift demand compared to the SC connections with steel strand. Hybrid strand, i.e. combination of steel strand and SMA strand, can further reduce the amount of SMA material in the connection. The use of SMA angles as energy dissipaters will remove the need for the replacement of the energy dissipating elements due to damage. Lastly, the applicability of SMA bolts in end-plate based interior and exterior connections are investigated through a parametric study.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/67887
note: CYCLIC PERFORMANCE OF SELF-CENTERING POST-TENSIONED STEEL BEAM-COLUMN CONNECTIONS USING SHAPE MEMORY ALLOY ENERGY DISSIPATORS by Md Arman Chowdhury B.Sc., Ahsanullah University of Science and Technology, 2013 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in The College of Graduate Studies (Civil Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) November 2018 © Md Arman Chowdhury, 2018 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis entitled: CYCLIC PERFORMANCE OF SELF-CENTERING POST TENSIONED STEEL BEAM COLUMN CONNECTIONS USING SHAPE MEMORY ALLOY ENERGY DISSIPATORS Submitted by Md Arman Chowdhury in partial fulfillment of the requirement of the degree of Master of Applied Science Dr. M. Shahria Alam, Associate Professor, School of Engineering, UBC Supervisor Dr. Solomon Tesfamariam, Professor, School of Engineering, UBC Supervisory Committee Member Dr. Abbas S. Milani, Professor, School of Engineering, UBC Supervisory Committee Member Dr. Homayoun Najjaran, Professor, School of Engineering, UBC University Examiner iii Abstract Driven by a need to reduce repair costs and downtime in structures following a major earthquake, self-centering (SC) systems have been introduced. Post-tensioned (PT) high strength steel strands have shown promising results in providing the SC capability in steel frames, where the beams are compressed to columns. In this study, the lateral cyclic performance of the SC connections is assessed through finite element analysis. At the beginning, the lateral load-deformation behavior of previously tested experimental specimens is validated with three-dimensional finite element models. The validated models are then modified accordingly to investigate the applicability of other techniques, i.e. stiffened angle connection, or other types of materials, i.e. shape memory alloy (SMA). Through design of …
has type: Thesis/Dissertation
date issued: 2019-02
is shown at: 10.14288/1.0374225
language: eng
degree discipline: Civil Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/67887