Active Moment Connection System for Mitigating Wind-Induced Building Vibrations
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Bibliografische Angaben
Autor(en): |
Sebastian Mendes
(Thornton Tomasetti, Boston, MA, USA)
Anurag Bura (Thornton Tomasetti, New York, NY, USA) |
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Medium: | Tagungsbeitrag | ||||
Sprache(n): | Englisch | ||||
Tagung: | IABSE Symposium: Challenges for Existing and Oncoming Structures, Prague, Czech Republic, 25-27 May 2022 | ||||
Veröffentlicht in: | IABSE Symposium Prague 2022 | ||||
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Seite(n): | 203-209 | ||||
Anzahl der Seiten (im PDF): | 7 | ||||
DOI: | 10.2749/prague.2022.0203 | ||||
Abstrakt: |
Modern tall buildings are increasingly being built in slender and complex forms. Limiting wind- induced vibrations of these buildings to meet serviceability criteria is increasingly challenging due to their flexibility. Tuned mass dampers (TMDs) are often incorporated into tall buildings for mitigating excessive wind-induced vibrations. However, traditional TMDs have several disadvantages including the necessity of an immense mass, occupation of a significant volume of interior space, and effectiveness over only a narrow band of vibration frequencies. This paper describes a proposed alternative system for alleviating wind-induced vibrations using a network of active moment connections. For buildings with a moment frame lateral force-resisting system, in- frame stiffness is concentrated at the fixity of the beam-to-column connections. The rotational stiffness of conventional bolted or welded moment connections is nominally static; the proposed active moment connections possess rotational stiffness that can be adjusted in response to a signal. Adjustment of the rotational stiffness of multiple beam-to-column moment connections positioned throughout a moment frame can allow for alteration of the global frame lateral stiffness, allowing greater control over a building’s dynamic response to wind loading. The proposed system envisions a network of active moment connections installed strategically throughout a building’s moment frame. The active moment connections are controlled by a central processing unit (CPU) that regulates the stiffness of the frame in real-time in response to input from external sensors mounted to the building, such as anemometers or wind pressure sensors. In this way, wind-induced vibrations can be mitigated by the CPU constantly regulating the global moment frame lateral stiffness. A numerical case study is presented for a portal-framed structure possessing active moment connections and loaded under service-level wind loads. The dynamic performance of the frame with and without the active moment connections is compared to demonstrate the effectiveness of the proposed system for alleviating wind-induced vibrations. |
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Copyright: | © 2022 International Association for Bridge and Structural Engineering (IABSE) | ||||
Lizenz: | Die Urheberrechte (Copyright) für dieses Werk sind rechtlich geschützt. Es darf nicht ohne die Zustimmung des Autors/der Autorin oder Rechteinhabers/-in weiter benutzt werden. |