Enhancing Friction Pendulum Isolation Systems Using Passive and Semi-Active Dampers
Friction pendulum systems (FPSs) are a common solution for isolating civil engineering structures under ground movements. The result is a base-isolated structure in which the base exhibits low shear stiffness in such a way that the input energy of the earthquake is concentrated and dissipated into i...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-08-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/10/16/5621 |
| _version_ | 1797558365051682816 |
|---|---|
| author | Christian A. Barrera-Vargas Iván M. Díaz José M. Soria Jaime H. García-Palacios |
| author_facet | Christian A. Barrera-Vargas Iván M. Díaz José M. Soria Jaime H. García-Palacios |
| author_sort | Christian A. Barrera-Vargas |
| collection | DOAJ |
| description | Friction pendulum systems (FPSs) are a common solution for isolating civil engineering structures under ground movements. The result is a base-isolated structure in which the base exhibits low shear stiffness in such a way that the input energy of the earthquake is concentrated and dissipated into it, leaving the superstructure free of damage. As a consequence, large displacements of the FPS may be demanded depending on the earthquake intensity and the fundamental period of the FPS. To accommodate these displacements, large-size isolators with high friction coefficients are usually required. However, the FPS will then exhibit poor re-centering capacity and the risk of future shocks will increase due to previous residual displacements, especially for low-intensity earthquakes. An alternative solution is to include a semi-active damper to the FPS, keeping the friction coefficient low and achieving both, limited base displacement under high-intensity earthquakes and good re-centering capacity under low-intensity ones. Thus, this work presents a design methodology for base isolators formed by an FPS with a damper added. The design methodology is applied to an FPS with a passive damper and to an FPS with a semi-active damper. Two ON-OFF control strategies are studied: (i) a fairly simple phase control, and (ii), a mechanical energy-predictive based algorithm. The advantages of semi-active FPSs with low friction coefficients with respect to FPS with high friction coefficients are demonstrated. The results with the designed semi-active FPS are compared with the single FPS and the FPS with a passive damper. Finally, the use of semi-active FPS allows us to enhance the FPS performance as the isolator size can be reduced while keeping the capacity to cope with low and high-intensity earthquakes without residual displacements. |
| first_indexed | 2024-03-10T17:29:28Z |
| format | Article |
| id | doaj.art-376e054eb41a4caea5d4d662583f6252 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T17:29:28Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-376e054eb41a4caea5d4d662583f62522023-11-20T10:03:41ZengMDPI AGApplied Sciences2076-34172020-08-011016562110.3390/app10165621Enhancing Friction Pendulum Isolation Systems Using Passive and Semi-Active DampersChristian A. Barrera-Vargas0Iván M. Díaz1José M. Soria2Jaime H. García-Palacios3Department of Continuum Mechanics and Theory of Structures, ETS Ingenieros Caminos, Canales y Puertos, Universidad Politécnica de Madrid, 28040 Madrid, SpainDepartment of Continuum Mechanics and Theory of Structures, ETS Ingenieros Caminos, Canales y Puertos, Universidad Politécnica de Madrid, 28040 Madrid, SpainDepartment of Continuum Mechanics and Theory of Structures, ETS Ingenieros Caminos, Canales y Puertos, Universidad Politécnica de Madrid, 28040 Madrid, SpainDepartment of Hydraulics, Energy and Environmental Engineering, ETS Ingenieros Caminos, Canales y Puertos, Universidad Politécnica de Madrid, 28040 Madrid, SpainFriction pendulum systems (FPSs) are a common solution for isolating civil engineering structures under ground movements. The result is a base-isolated structure in which the base exhibits low shear stiffness in such a way that the input energy of the earthquake is concentrated and dissipated into it, leaving the superstructure free of damage. As a consequence, large displacements of the FPS may be demanded depending on the earthquake intensity and the fundamental period of the FPS. To accommodate these displacements, large-size isolators with high friction coefficients are usually required. However, the FPS will then exhibit poor re-centering capacity and the risk of future shocks will increase due to previous residual displacements, especially for low-intensity earthquakes. An alternative solution is to include a semi-active damper to the FPS, keeping the friction coefficient low and achieving both, limited base displacement under high-intensity earthquakes and good re-centering capacity under low-intensity ones. Thus, this work presents a design methodology for base isolators formed by an FPS with a damper added. The design methodology is applied to an FPS with a passive damper and to an FPS with a semi-active damper. Two ON-OFF control strategies are studied: (i) a fairly simple phase control, and (ii), a mechanical energy-predictive based algorithm. The advantages of semi-active FPSs with low friction coefficients with respect to FPS with high friction coefficients are demonstrated. The results with the designed semi-active FPS are compared with the single FPS and the FPS with a passive damper. Finally, the use of semi-active FPS allows us to enhance the FPS performance as the isolator size can be reduced while keeping the capacity to cope with low and high-intensity earthquakes without residual displacements.https://www.mdpi.com/2076-3417/10/16/5621base isolationfriction pendulum systemsemi-active controlphase controlenergy-predictive-based control |
| spellingShingle | Christian A. Barrera-Vargas Iván M. Díaz José M. Soria Jaime H. García-Palacios Enhancing Friction Pendulum Isolation Systems Using Passive and Semi-Active Dampers Applied Sciences base isolation friction pendulum system semi-active control phase control energy-predictive-based control |
| title | Enhancing Friction Pendulum Isolation Systems Using Passive and Semi-Active Dampers |
| title_full | Enhancing Friction Pendulum Isolation Systems Using Passive and Semi-Active Dampers |
| title_fullStr | Enhancing Friction Pendulum Isolation Systems Using Passive and Semi-Active Dampers |
| title_full_unstemmed | Enhancing Friction Pendulum Isolation Systems Using Passive and Semi-Active Dampers |
| title_short | Enhancing Friction Pendulum Isolation Systems Using Passive and Semi-Active Dampers |
| title_sort | enhancing friction pendulum isolation systems using passive and semi active dampers |
| topic | base isolation friction pendulum system semi-active control phase control energy-predictive-based control |
| url | https://www.mdpi.com/2076-3417/10/16/5621 |
| work_keys_str_mv | AT christianabarreravargas enhancingfrictionpendulumisolationsystemsusingpassiveandsemiactivedampers AT ivanmdiaz enhancingfrictionpendulumisolationsystemsusingpassiveandsemiactivedampers AT josemsoria enhancingfrictionpendulumisolationsystemsusingpassiveandsemiactivedampers AT jaimehgarciapalacios enhancingfrictionpendulumisolationsystemsusingpassiveandsemiactivedampers |