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Full-Scale Testing and Improvements to the Design and Use of the Gapped-Inclined Bracing System.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Full-Scale Testing and Improvements to the Design and Use of the Gapped-Inclined Bracing System./
Author:	Salmon, Jeffrey.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	425 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-01, Section: A.
Contained By:	Dissertations Abstracts International83-01A.
Subject:	Engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28415820
ISBN:	9798522944438

Full-Scale Testing and Improvements to the Design and Use of the Gapped-Inclined Bracing System.
Salmon, Jeffrey.

Full-Scale Testing and Improvements to the Design and Use of the Gapped-Inclined Bracing System. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 425 p.

Source: Dissertations Abstracts International, Volume: 83-01, Section: A.

Thesis (Ph.D.)--University of Toronto (Canada), 2021.

This item must not be sold to any third party vendors.

The gapped-inclined bracing (GIB) system is an innovative retrofitting device that was developed to improve the performance and prevent the collapse of reinforced concrete (RC) soft-storey buildings during earthquakes. The GIB system was designed to increase the displacement capacity of the soft ground floor without increasing the overall lateral resistance of the building. During an earthquake, the ground floor of GIB-retrofitted structures acts as an isolation layer protecting the upper floors of the building while maintaining the integrity and gravity-load-carrying capacity of the soft ground floor; this is accomplished using the geometry and gap element of the GIB system.This dissertation presents five contributions to the development of the GIB system. First, a four-phase, full-scale experimental programme of the device was completed. In the second phase of testing, the reversed cyclic response of two single storey, single bay, RC planar frames was studied: a conventional soft-storey and a GIB-retrofitted soft-storey. These frames represented the ground-floor of existing seismically vulnerable structures. The lateral displacement mechanism of the frames was governed by flexural hinging at the top and bottom of the columns, representing a common soft-storey failure. The results confirmed the improved seismic performance of GIB-retrofitted structures and revealed a stable GIB-only rocking response at extreme lateral drifts, which acts as a collapse-prevention system and a viable mechanism for post-earthquake performance.Second, these experiments were modelled using three computer software: OpenSees, VecTor2, and ATENA. Because damage of the structure was governed by flexural hinging, OpenSees was found to best represent the response of the experimental specimens.Third, the limit states of common GIB-to-structure connections were identified. Detailed finite-element analyses were performed to highlight potential failure modes and suggest strengthening options to increase the capacity of the connection.Fourth, the limits of stability for the bidirectional response of GIB-retrofitted structures were identified. Finally, with an improved understanding of the GIB system, a step-by-step design procedure for the retrofit of soft-storey buildings using the GIB system was proposed. The design procedure was exemplified for a 5-storey case-study structure. The effects of including supplemental damping in parallel with the GIB system was also investigated.

ISBN: 9798522944438Subjects--Topical Terms:

586835
Engineering.
Subjects--Index Terms:

Full-scale experiments

Full-Scale Testing and Improvements to the Design and Use of the Gapped-Inclined Bracing System.
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245 1 0 $a Full-Scale Testing and Improvements to the Design and Use of the Gapped-Inclined Bracing System.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2021
300 $a 425 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-01, Section: A.
500 $a Advisor: Christopoulos, Constantin.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2021.
506 $a This item must not be sold to any third party vendors.
520 $a The gapped-inclined bracing (GIB) system is an innovative retrofitting device that was developed to improve the performance and prevent the collapse of reinforced concrete (RC) soft-storey buildings during earthquakes. The GIB system was designed to increase the displacement capacity of the soft ground floor without increasing the overall lateral resistance of the building. During an earthquake, the ground floor of GIB-retrofitted structures acts as an isolation layer protecting the upper floors of the building while maintaining the integrity and gravity-load-carrying capacity of the soft ground floor; this is accomplished using the geometry and gap element of the GIB system.This dissertation presents five contributions to the development of the GIB system. First, a four-phase, full-scale experimental programme of the device was completed. In the second phase of testing, the reversed cyclic response of two single storey, single bay, RC planar frames was studied: a conventional soft-storey and a GIB-retrofitted soft-storey. These frames represented the ground-floor of existing seismically vulnerable structures. The lateral displacement mechanism of the frames was governed by flexural hinging at the top and bottom of the columns, representing a common soft-storey failure. The results confirmed the improved seismic performance of GIB-retrofitted structures and revealed a stable GIB-only rocking response at extreme lateral drifts, which acts as a collapse-prevention system and a viable mechanism for post-earthquake performance.Second, these experiments were modelled using three computer software: OpenSees, VecTor2, and ATENA. Because damage of the structure was governed by flexural hinging, OpenSees was found to best represent the response of the experimental specimens.Third, the limit states of common GIB-to-structure connections were identified. Detailed finite-element analyses were performed to highlight potential failure modes and suggest strengthening options to increase the capacity of the connection.Fourth, the limits of stability for the bidirectional response of GIB-retrofitted structures were identified. Finally, with an improved understanding of the GIB system, a step-by-step design procedure for the retrofit of soft-storey buildings using the GIB system was proposed. The design procedure was exemplified for a 5-storey case-study structure. The effects of including supplemental damping in parallel with the GIB system was also investigated.
590 $a School code: 0779.
650 4 $a Engineering. $3 586835
650 4 $a Civil engineering. $3 860360
650 4 $a Strain gauges. $3 3563166
650 4 $a Friction. $3 650299
650 4 $a Propagation. $3 3680519
650 4 $a Manufacturing. $3 3389707
650 4 $a Masonry. $3 685951
650 4 $a Buildings. $3 861672
650 4 $a Concrete. $3 666349
650 4 $a Design. $3 518875
650 4 $a Earthquakes. $3 535233
650 4 $a Seismic engineering. $3 3561056
650 4 $a Reinforced concrete. $3 861675
650 4 $a Viscoelasticity. $3 718183
650 4 $a Boundary conditions. $3 3560411
650 4 $a Shear strength. $3 3680813
653 $a Full-scale experiments
653 $a Gapped-inclined brace
653 $a Numerical modelling
653 $a Seismic retrofit
653 $a Soft-storey buildings
690 $a 0537
690 $a 0543
690 $a 0389
710 2 $a University of Toronto (Canada). $b Civil Engineering. $3 2104053
773 0 $t Dissertations Abstracts International $g 83-01A.
790 $a 0779
791 $a Ph.D.
792 $a 2021
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28415820