{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/80025"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/80025","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Concrete Shear Walls Retrofit by Weakening Through Vertical Cuts and Self-Centering","abstract":"M.S.","abstract_html":"M.S.","abstract_has_math":false,"creators":["Iturburu, Lissette"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Okumus, Pinar","Civil, Structural and Environmental Engineering"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-07-30T15:11:56Z","date_published":"2019-07-30T15:11:56Z","updated_at":"2026-07-27T19:05:23Z","subjects":["civil engineering"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/80025","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Okumus, Pinar","Civil, Structural and Environmental Engineering"]},{"key":"dc:creator","label":"Author","values":["Iturburu, Lissette"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-07-30T15:11:56Z","2019","2019-05-17 11:47:22"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["civil engineering"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/80025"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["M.S.","This thesis explores seismic retrofit of poorly detailed reinforced concrete shear walls by weakening them through vertical and/or horizontal cuts and by adding self-centering through unbonded post-tensioning. Weakening is used to shift failure from brittle to ductile modes. Unbonded post-tensioning is used to reduce residual displacements after an earthquake. Finite element analyses were used to understand the impact of vertical and/or horizontal cuts and of unbonded post-tensioning. These analyses were validated with results of tests on conventional shear walls from the literature. Two walls with different failure mechanisms were analyzed: a lightly reinforced wall that failed with shear-slip and a shear critical wall. Analyses were used to study parameters such as gap between walls, initial post-tensioning force levels and confinement at walls toes that may play a role in structural response of retrofitted walls. The results of this investigation showed promising results in modifying the brittle response of these wall, to a more flexural response. The analysis showed that the drift at peak capacity increased at least 70% for both configurations (with steel confinement) in the shear critical wall and the lightly reinforced wall, when compared to their respective original wall. It was found that by using these method, the strength of the wall could be partially recovered and that the crushing of concrete that was experienced in the original walls along with the extension of the cracking could be mitigated, with the use of an optimum post-tensioning force level. For the first weakening configuration, the lightly reinforced wall with the vertical cut and 2.8% Agf’c of post-tensioning force level, the wall recovered 82% of its original peak strength. For the shear-dominated wall, the wall recovered 50% of its peak strength, with 5% of the Agf’c. For the second configuration, the rocking wall for the lightly reinforced wall and 2.8% Agf’c of post-tensioning force level, the wall recovered 70% of its original peak strength. For the shear-dominated wall with the rocking configuration, the wall recovered 30% of its peak strength, with 15% of the Agf’c."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Concrete Shear Walls Retrofit by Weakening Through Vertical Cuts and Self-Centering"]}]}],"canonical_facts":{"dc:contributor":["Okumus, Pinar","Civil, Structural and Environmental Engineering"],"dc:creator":["Iturburu, Lissette"],"dc:date":["2019-07-30T15:11:56Z","2019","2019-05-17 11:47:22"],"dc:description":["M.S.","This thesis explores seismic retrofit of poorly detailed reinforced concrete shear walls by weakening them through vertical and/or horizontal cuts and by adding self-centering through unbonded post-tensioning. Weakening is used to shift failure from brittle to ductile modes. Unbonded post-tensioning is used to reduce residual displacements after an earthquake. Finite element analyses were used to understand the impact of vertical and/or horizontal cuts and of unbonded post-tensioning. These analyses were validated with results of tests on conventional shear walls from the literature. Two walls with different failure mechanisms were analyzed: a lightly reinforced wall that failed with shear-slip and a shear critical wall. Analyses were used to study parameters such as gap between walls, initial post-tensioning force levels and confinement at walls toes that may play a role in structural response of retrofitted walls. The results of this investigation showed promising results in modifying the brittle response of these wall, to a more flexural response. The analysis showed that the drift at peak capacity increased at least 70% for both configurations (with steel confinement) in the shear critical wall and the lightly reinforced wall, when compared to their respective original wall. It was found that by using these method, the strength of the wall could be partially recovered and that the crushing of concrete that was experienced in the original walls along with the extension of the cracking could be mitigated, with the use of an optimum post-tensioning force level. For the first weakening configuration, the lightly reinforced wall with the vertical cut and 2.8% Agf’c of post-tensioning force level, the wall recovered 82% of its original peak strength. For the shear-dominated wall, the wall recovered 50% of its peak strength, with 5% of the Agf’c. For the second configuration, the rocking wall for the lightly reinforced wall and 2.8% Agf’c of post-tensioning force level, the wall recovered 70% of its original peak strength. For the shear-dominated wall with the rocking configuration, the wall recovered 30% of its peak strength, with 15% of the Agf’c."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/80025"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["civil engineering"],"dc:title":["Concrete Shear Walls Retrofit by Weakening Through Vertical Cuts and Self-Centering"],"dc:type":["Text","Thesis"]},"updated_at":"2026-07-27T19:05:23Z"}