EXPERIMENTAL INVESTIGATION OF CONCRETE COUPLED WALL SYSTEMS WITH POST-TENSIONED STEEL COUPLING BEAM
Post-tensioned coupled shear wall system is characterized by good seismic specifications like a self-centering capability and an ability to sustain large nonlinear lateral de...
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| Format: | Article |
| Language: | fas |
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Sharif University of Technology
2021-02-01
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| Series: | مهندسی عمران شریف |
| Subjects: | |
| Online Access: | https://sjce.journals.sharif.edu/article_21840_9c537cc33f395332f493ed2713774c07.pdf |
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| author | M. S. Zareian M.R. Esfahani A. Hosseini |
| author_facet | M. S. Zareian M.R. Esfahani A. Hosseini |
| author_sort | M. S. Zareian |
| collection | DOAJ |
| description | Post-tensioned coupled shear wall system is characterized by good seismic
specifications like a self-centering capability and an ability to sustain large
nonlinear lateral deformations with little damage and negligible residual
deformation. In this system, the coupling beam is not embedded into the walls,
and coupling of concrete walls is performed by posttensioning beam to the walls
using unbonded post-tensioning (PT) steel strands. In this paper, the seismic
behavior of hybrid coupled wall systems with post-tensioned steel coupling beam
was investigated experimentally. In order to dissipate seismic energy and
reduce displacements of system, two friction dampers were used in the
beam-to-wall connection region. To study the behavior of the system, a friction
damper was first tested at different frequencies; then, four 2/3-scale
posttensioned hybrid coupled wall sub-assemblages equipped with friction
dampers were tested subjected to reversed-cyclic lateral loading. Each
sub-assemblage included a half-length steel coupling beam and the adjacent
concrete wall region at a floor level. The test specimens consisted of one
control specimen without friction damper and three specimens equipped with
friction \ dampers with \ various damper \ normal \ forces and \ different \ initial beam post-tensioning (PT) \ steel stresses. The test results showed that the system had very good lateral stiffness, strength, and ductility with little damage up
to 8\% lateral drift. The nonlinear deformation in this system occurs because of
the gap opening at the beam-to-wall interface. The friction damper uses these
gap opening displacements to provide supplemental energy dissipation. Friction
dampers provide considerable energy dissipation at the system, while the
self-centering capability of the system remains. The restoring effect of the
post-tensioning steel strands causes closing the gap upon unloading and
provides a self-centering behavior and flag-shaped hysteresis loops for
specimens equipped with friction dampers. Based on the test results, the
system, even after a severe earthquake, suffers limited damage and requires
little repair. |
| first_indexed | 2024-03-12T13:48:06Z |
| format | Article |
| id | doaj.art-7380fb046802419cac563992e8fea9bc |
| institution | Directory Open Access Journal |
| issn | 2676-4768 2676-4776 |
| language | fas |
| last_indexed | 2024-03-12T13:48:06Z |
| publishDate | 2021-02-01 |
| publisher | Sharif University of Technology |
| record_format | Article |
| series | مهندسی عمران شریف |
| spelling | doaj.art-7380fb046802419cac563992e8fea9bc2023-08-23T07:51:24ZfasSharif University of Technologyمهندسی عمران شریف2676-47682676-47762021-02-0136.24.19310510.24200/j30.2020.54221.262121840EXPERIMENTAL INVESTIGATION OF CONCRETE COUPLED WALL SYSTEMS WITH POST-TENSIONED STEEL COUPLING BEAMM. S. Zareian0M.R. Esfahani1A. Hosseini2Dept. of Civil Engineering Ferdowsi University of MashhadDept. of Civil Engineering Ferdowsi University of MashhadDept. of Civil Engineering University of TehranPost-tensioned coupled shear wall system is characterized by good seismic specifications like a self-centering capability and an ability to sustain large nonlinear lateral deformations with little damage and negligible residual deformation. In this system, the coupling beam is not embedded into the walls, and coupling of concrete walls is performed by posttensioning beam to the walls using unbonded post-tensioning (PT) steel strands. In this paper, the seismic behavior of hybrid coupled wall systems with post-tensioned steel coupling beam was investigated experimentally. In order to dissipate seismic energy and reduce displacements of system, two friction dampers were used in the beam-to-wall connection region. To study the behavior of the system, a friction damper was first tested at different frequencies; then, four 2/3-scale posttensioned hybrid coupled wall sub-assemblages equipped with friction dampers were tested subjected to reversed-cyclic lateral loading. Each sub-assemblage included a half-length steel coupling beam and the adjacent concrete wall region at a floor level. The test specimens consisted of one control specimen without friction damper and three specimens equipped with friction \ dampers with \ various damper \ normal \ forces and \ different \ initial beam post-tensioning (PT) \ steel stresses. The test results showed that the system had very good lateral stiffness, strength, and ductility with little damage up to 8\% lateral drift. The nonlinear deformation in this system occurs because of the gap opening at the beam-to-wall interface. The friction damper uses these gap opening displacements to provide supplemental energy dissipation. Friction dampers provide considerable energy dissipation at the system, while the self-centering capability of the system remains. The restoring effect of the post-tensioning steel strands causes closing the gap upon unloading and provides a self-centering behavior and flag-shaped hysteresis loops for specimens equipped with friction dampers. Based on the test results, the system, even after a severe earthquake, suffers limited damage and requires little repair.https://sjce.journals.sharif.edu/article_21840_9c537cc33f395332f493ed2713774c07.pdfhybrid coupled wallsteel coupling beampost-tensioningfriction damperself-centering. |
| spellingShingle | M. S. Zareian M.R. Esfahani A. Hosseini EXPERIMENTAL INVESTIGATION OF CONCRETE COUPLED WALL SYSTEMS WITH POST-TENSIONED STEEL COUPLING BEAM مهندسی عمران شریف hybrid coupled wall steel coupling beam post-tensioning friction damper self-centering. |
| title | EXPERIMENTAL INVESTIGATION OF CONCRETE COUPLED WALL SYSTEMS WITH POST-TENSIONED STEEL COUPLING BEAM |
| title_full | EXPERIMENTAL INVESTIGATION OF CONCRETE COUPLED WALL SYSTEMS WITH POST-TENSIONED STEEL COUPLING BEAM |
| title_fullStr | EXPERIMENTAL INVESTIGATION OF CONCRETE COUPLED WALL SYSTEMS WITH POST-TENSIONED STEEL COUPLING BEAM |
| title_full_unstemmed | EXPERIMENTAL INVESTIGATION OF CONCRETE COUPLED WALL SYSTEMS WITH POST-TENSIONED STEEL COUPLING BEAM |
| title_short | EXPERIMENTAL INVESTIGATION OF CONCRETE COUPLED WALL SYSTEMS WITH POST-TENSIONED STEEL COUPLING BEAM |
| title_sort | experimental investigation of concrete coupled wall systems with post tensioned steel coupling beam |
| topic | hybrid coupled wall steel coupling beam post-tensioning friction damper self-centering. |
| url | https://sjce.journals.sharif.edu/article_21840_9c537cc33f395332f493ed2713774c07.pdf |
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