Facade-Integrated Semi-Active Vibration Control for Wind-Excited Super-Slender Tall Buildings

Zhang, Yangwen; Schauer, Thomas; Wernicke, Laurenz; Wulff, Wulf; Bleicher, Achim

doi:10.1016/j.ifacol.2020.12.1585

Cited by 8 publications

(5 citation statements)

References 11 publications

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“…Under wind loads, the overturning moment at the building base differs in proportion to the square of the height of the building; therefore, supertall slender towers are much more susceptible to these loads (Zhang et al. , 2020; Jafari and Alipour, 2021b).…”

Section: Resultsmentioning

confidence: 99%

“…The median for tubular towers was around 8, the lowest in China Resources Tower with 6.6 and the highest in 432 Park Avenue with 15. Under wind loads, the overturning moment at the building base differs in proportion to the square of the height of the building; therefore, supertall slender towers are much more susceptible to these loads (Zhang et al, 2020;Jafari and Alipour, 2021b). Outriggered frame system is commonly used in tall slender towers to provide lateral stiffness against overturning.…”

Section: Interrelations Of Slenderness Ratio and Main Design Criteriamentioning

confidence: 99%

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Interrelations of slenderness ratio and main design criteria in supertall buildings

Ilgın

2022

IJBPA

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PurposeTo date, there are no studies in the literature that provide a comprehensive understanding of the interrelationships between the slenderness ratio and the main design criteria in supertall towers (=300 m). In this paper, this important issue was explored using detailed data collected from 75 cases.Design/methodology/approachThis paper was carried out with a comprehensive literature review including the database of the Council on Tall Buildings and Urban Habitat(CTBUH) (CTBUH, 2022), peer-reviewed journals, MSc theses and PhD dissertations, conference proceedings, fact sheets, architectural and structural magazines and other Internet sources. In this study, the case study method was also used to gather and consolidate information about supertall towers to analyze the interrelationships. Cases were 75 supertall buildings in various countries [44 from Asia (37 from China), 16 from the Middle East (6 from Dubai, the United Arab Emirates), 11 from the United States of America and 3 from Russia, 1 from the UK].FindingsThe paper's findings highlighted as follows: (1) for buildings in the height range of 300–399 m, the slenderness ratio was usually between 7 and 7.9 and megatall towers were frequently built at a slenderness ratio of 10–15; (2) the median slenderness ratio of buildings in the 400–599 m height ranges was around 8.6; (3) a trend towards supertall slender buildings (=8) was observed in Asia, the Middle East and North America; (4) residential, office and mixed-use towers had a median slenderness ratio of over 7.5; (5) all building forms were utilized in the construction of slender towers (>8); (6) the medium slenderness ratio was around 8 for supertall buildings constructed with outriggered frame and tube systems; (7) especially concrete towers reached values pushing the limits of slenderness (>10) and (8) since the number of some supertall building groups (e.g. steel towers) was not sufficient, establishing a scientific relationship between aspect ratio and related design criteria was not possible.Originality/valueTo date, there are no studies in the literature that provide a comprehensive understanding of the interrelationships between the slenderness ratio and the main design criteria in supertall towers (=300 m). This important issue was explored using detailed data collected from 75 cases.

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Section: Resultsmentioning

confidence: 99%

Section: Interrelations Of Slenderness Ratio and Main Design Criteriamentioning

confidence: 99%

Interrelations of slenderness ratio and main design criteria in supertall buildings

Ilgın

2022

IJBPA

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“…The rolling friction is opposite the direction of the relative velocity x fr,i . Modal reduction (Zhang, Schauer, Wernicke, Wulff , & Bleicher, 2020) is carried out to reduce the model complexity, which speeds up the optimization of the system introduced in the next section. Wind loads only excite the lower modes, mainly the fi rst mode, because of the phenomenon of lock-in in vortex-induced vibration.…”

Section: System Modellingmentioning

confidence: 99%

“…Distributed-Multiple Tuned Façade Damping System (d-MTFD) with innovative parallel moveable connections is proposed by (Zhang, Schauer, Wernicke, Wulff, & Bleicher, 2020), and its performance for reducing wind-induced oscillation has been intensively studied. Using parallel connection, the façade is fixed in the direction perpendicular to the primary structure but moveable in the direction parallel to the primary structure.…”

Section: Introductionmentioning

confidence: 99%

Powerskin Conference Proceedings

Auer¹,

Knaack

Schneider

2021

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The building skin has evolved enormously over the past decades. The energy performance and environmental quality of both the interior and exterior of buildings are primarily determined by the building envelope. The façade has experienced a change in its role as an adaptive climate control system that leverages the synergies between form, material, mechanical and energy systems towards an architectural integration of energy generation. The PowerSKIN Conference aims to address the role of building skins to accomplish a carbonneutral building stock. The focus of the PowerSKIN issue 2021 deals with the question of whether simplicity and robustness stay in contradiction to good performance of buildings skins or whether they even complement each other: simplicity vs performance? As an international scientific event - usually held at the BAU trade fair in Munich - the PowerSKIN Conference builds a bridge between science and practice, between research and construction, and between the latest developments and innovations for the façade of the future. Topics such as building operation, embodied energy, energy generation and storage in the context of the three conference sessions envelope, energy and environment are considered: – Envelope: The building envelope as an interface for the interaction between indoor and outdoor environment. This topic is focused on function, technical development and material properties. – Energy: New concepts, accomplished projects, and visions for the interaction between building structure, envelope and energy technologies. – Environment: Façades or elements of façades, which aim to provide highly comfortable surroundings where environmental control strategies as well as energy generation and/or storage are an integrated part of an active skin. The Technical University of Munich, TU Darmstadt, and TU Delft are signing responsible for the organisation of the conference. It is the third event of a biennial series: April 9th 2021, architects, engineers, and scientists present their latest developments and research projects for public discussion and reflection. For the first time, the conference will be a virtual event. On the one hand, this is a pity, as conferences are also about meeting people and social interaction; on the other hand, it offers the possibility that we can reach more people who connect from all over the world.

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“…This makes the concept also interesting for retrofitting. In conclusion, we named it distributed multiple tuned facade damping (d-MTFD) system (Zhang 2020).…”

Section: Introduction -Problem and Aimmentioning

confidence: 99%

How to Exploit the Glass Mass for Damping a Building?

Engelmann

Wulff

Lorenz

et al. 2022

CGC

Self Cite

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The worlds spectacular skylines host tall and slender buildings to create a maximum of office, residential and commercial space on a minimized footprint. These structures need to cope with increasing wind forces at height and are additionally affected by wind-induced vibration due to their lower natural frequencies. The resulting vibrations make users uncomfortable. Therefore, heavy tuned mass dampers are installed in structures and occupy valuable space especially in the costliest top-floors. As an example, Taipei 101’s steel damper is located between the 87th and 91st floor and weights astonishing 660 metric tons. This raises the need for additional reinforcement which increases cost and carbon footprint.Most buildings in expensive metropolises are cladded with remarkable glass facades. Therefore, we asked the question if it was possible to use the existing mass – more specifically the glass mass in a Double‑Skin Facade – to dampen the building’s movement, create a comfortable space for the user, exploit more floor area for the investor and finally to minimize the amount of building material to reduce carbon footprint for society. The idea was realized in a collaborative research effort of TU Berlin, BTU Cottbus-Senftenberg and Josef Gartner GmbH that resulted in a full-scale mock-up of a Double‑Skin Facade. Its outer skin can move laterally on a guide rail system. As the building starts to move, the facade's inner skin remains fixed to the base structure while the outer skin follows the building’s movement in a delayed manner due to its mass inertia. The fixed inner skin and the moveable outer skin are connected by a spring system that is tuned to the first natural frequency of the base structure. During the motion of the facade’s outer skin, the spring system redirects the relative movement and generates a stabilizing force for the base structure in the opposite direction. Additionally, an electrical machine is placed in between to provide an adjustable damping effect for semi-active and passive control. It also serves the purpose of a generator to study the opportunity to harvest energy. The paper shows the structural design options for the novel facade concept in the context of a project review of Double-Skin and Closed-Cavity Facades. The function of a full-scale mock-up, its fabrication and installation are described to show feasibility and ongoing challenges. First test results reveal a close match between theoretical assumptions and the applied testing. This engineering-driven and experimentally validated design opens a new field of architectural options in sustainable facade design which is focused on tuning physical parameters that affect the damping properties of the global structure.

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Facade-Integrated Semi-Active Vibration Control for Wind-Excited Super-Slender Tall Buildings

Cited by 8 publications

References 11 publications

Interrelations of slenderness ratio and main design criteria in supertall buildings

Interrelations of slenderness ratio and main design criteria in supertall buildings

Powerskin Conference Proceedings

How to Exploit the Glass Mass for Damping a Building?

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