Optimized Strengthening Based on Concrete Jacketing for Minimum Eccentricity
The coupled lateral-torsional response is observed in building structures subjected to dynamic excitation due to lack of symmetry in terms of mass/stiffness in any of the stories’ plan views; such structural systems are called eccentric. Much damage and even collapse are concerned with building stru...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-04-01
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| Series: | Frontiers in Built Environment |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fbuil.2022.856380/full |
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| author | Chara Ch. Mitropoulou Iordanis A. Naziris Iordanis A. Naziris Nikos Ath. Kallioras Nikos D. Lagaros |
| author_facet | Chara Ch. Mitropoulou Iordanis A. Naziris Iordanis A. Naziris Nikos Ath. Kallioras Nikos D. Lagaros |
| author_sort | Chara Ch. Mitropoulou |
| collection | DOAJ |
| description | The coupled lateral-torsional response is observed in building structures subjected to dynamic excitation due to lack of symmetry in terms of mass/stiffness in any of the stories’ plan views; such structural systems are called eccentric. Much damage and even collapse are concerned with building structures with asymmetric plan views. Combined torsional-translational vibration of their structural system results in higher ductility demands, especially to vertical structural elements located at the perimeter of the plan view. This study examines the minimization problem of the torsional response of an eccentric, multi-story reinforced concrete (RC) building by strengthening its vertical structural elements with RC jackets. The problem of minimizing the eccentricity between mass and rigidity centers for all story layouts and the corresponding minimization problem of the eccentricity between mass and strength centers for all stories are considered two separate formulations for the reduction of the torsional response optimization problem. Based on recent studies, the center of strength is preferable for assessing the torsional response of buildings in case of inelastic response. The imperialist competitive algorithm (ICA), a member of the family of evolutionary search algorithms, is used to solve the two optimization problems. The optimization problems are formulated for the case study building considered after assessing its structural behavior and capacity through nonlinear static analyses before and after strengthening. The later process was implemented to meet code requirements and examine the improvements achieved through optimization. |
| first_indexed | 2024-12-10T13:17:18Z |
| format | Article |
| id | doaj.art-3edc330bd5d542cda55b1613741743e8 |
| institution | Directory Open Access Journal |
| issn | 2297-3362 |
| language | English |
| last_indexed | 2024-12-10T13:17:18Z |
| publishDate | 2022-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Built Environment |
| spelling | doaj.art-3edc330bd5d542cda55b1613741743e82022-12-22T01:47:29ZengFrontiers Media S.A.Frontiers in Built Environment2297-33622022-04-01810.3389/fbuil.2022.856380856380Optimized Strengthening Based on Concrete Jacketing for Minimum EccentricityChara Ch. Mitropoulou0Iordanis A. Naziris1Iordanis A. Naziris2Nikos Ath. Kallioras3Nikos D. Lagaros4Institute of Structural Analysis and Antiseismic Research, School of Civil Engineering, National Technical University of Athens, Athens, GreeceInstitute of Structural Analysis and Antiseismic Research, School of Civil Engineering, National Technical University of Athens, Athens, GreeceSpecial Service of European Union Structural Funds for the Ministry of Maritime Affairs and Insular Policy, Piraeus, GreeceInstitute of Structural Analysis and Antiseismic Research, School of Civil Engineering, National Technical University of Athens, Athens, GreeceInstitute of Structural Analysis and Antiseismic Research, School of Civil Engineering, National Technical University of Athens, Athens, GreeceThe coupled lateral-torsional response is observed in building structures subjected to dynamic excitation due to lack of symmetry in terms of mass/stiffness in any of the stories’ plan views; such structural systems are called eccentric. Much damage and even collapse are concerned with building structures with asymmetric plan views. Combined torsional-translational vibration of their structural system results in higher ductility demands, especially to vertical structural elements located at the perimeter of the plan view. This study examines the minimization problem of the torsional response of an eccentric, multi-story reinforced concrete (RC) building by strengthening its vertical structural elements with RC jackets. The problem of minimizing the eccentricity between mass and rigidity centers for all story layouts and the corresponding minimization problem of the eccentricity between mass and strength centers for all stories are considered two separate formulations for the reduction of the torsional response optimization problem. Based on recent studies, the center of strength is preferable for assessing the torsional response of buildings in case of inelastic response. The imperialist competitive algorithm (ICA), a member of the family of evolutionary search algorithms, is used to solve the two optimization problems. The optimization problems are formulated for the case study building considered after assessing its structural behavior and capacity through nonlinear static analyses before and after strengthening. The later process was implemented to meet code requirements and examine the improvements achieved through optimization.https://www.frontiersin.org/articles/10.3389/fbuil.2022.856380/fullstrength eccentricitystiffness eccentricitymetaheuristicscolumn strengtheningconcrete jacketingoptimization |
| spellingShingle | Chara Ch. Mitropoulou Iordanis A. Naziris Iordanis A. Naziris Nikos Ath. Kallioras Nikos D. Lagaros Optimized Strengthening Based on Concrete Jacketing for Minimum Eccentricity Frontiers in Built Environment strength eccentricity stiffness eccentricity metaheuristics column strengthening concrete jacketing optimization |
| title | Optimized Strengthening Based on Concrete Jacketing for Minimum Eccentricity |
| title_full | Optimized Strengthening Based on Concrete Jacketing for Minimum Eccentricity |
| title_fullStr | Optimized Strengthening Based on Concrete Jacketing for Minimum Eccentricity |
| title_full_unstemmed | Optimized Strengthening Based on Concrete Jacketing for Minimum Eccentricity |
| title_short | Optimized Strengthening Based on Concrete Jacketing for Minimum Eccentricity |
| title_sort | optimized strengthening based on concrete jacketing for minimum eccentricity |
| topic | strength eccentricity stiffness eccentricity metaheuristics column strengthening concrete jacketing optimization |
| url | https://www.frontiersin.org/articles/10.3389/fbuil.2022.856380/full |
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