The damped outrigger concept for tall buildings

Smith, Rob; Willford, Michael

doi:10.1002/tal.413

Cited by 196 publications

(104 citation statements)

References 12 publications

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“…While the best way to get information about damping is to go on site and measure it, there have been some efforts to develop empirical predictive tools for damping estimation based on full-scale observations [6,18]. Tamura and Yoshida [19] presented a damping predictor for tall buildings that is dependent on the vibrations amplitude.…”

Section: Modeling Of the Buildingmentioning

confidence: 99%

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Proposed Configurations for the Use of Smart Dampers with Bracings in Tall Buildings

Aly

Zasso

Resta

2012

Smart Materials Research

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This paper presents wind-induced response reduction in a very slender building using smart dampers with proposed bracingslever mechanism system. The building presents a case study of an engineered design that is instructive. The paper shows that shear response and flexural response of tall buildings present two very different cases for vibration suppression. Smart dampers are implemented optimally in the building to reduce its response in the lateral directions for both structural safety and occupant comfort concerns. New bracings-lever mechanism configurations are proposed for the dampers to improve their performance. The study shows how the proposed configurations can enable application to flexural response and scenarios where the interstory drift is not enough for dampers to work effectively. In addition, a decentralized bang-bang controller improved the performance of the smart dampers.

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Section: Modeling Of the Buildingmentioning

confidence: 99%

“…Viscous dampers and semiactive dampers can be used as alternatives to overcome the difficulties associated with the application of TMDs and ATMDs. These devices do not require frequency tuning [6]. It is therefore sometimes possible to damp several modes with one device.…”

Section: Introductionmentioning

confidence: 99%

Proposed Configurations for the Use of Smart Dampers with Bracings in Tall Buildings

Aly

Zasso

Resta

2012

Smart Materials Research

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“…More recently viscous dampers with similar behaviour have been installed in the two St. Francis Shangri-La Towers in Manila, Philippines, each rising to 213 m. In this case, 32 viscous dampers (Figure 7) are installed into the towers structure according to an Arup newly developed and patented configuration [24,25]. A wide laboratory testing campaign was carried out, aimed at verifying the behaviour of fluid viscous dampers during both wind storms and earthquake [23].…”

Section: Applications In Buildings Outside Italymentioning

confidence: 99%

Recent applications of Italian anti-seismic devices

Castellano

Infanti

2009

WIT Transactions on the Built Environment

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In the last three decades anti-seismic devices, in particular those implementing the passive control of structural response through seismic isolation and energy dissipation, have undergone great development, finding many applications in both new and existing structures. Since the 1970s Italy has been giving a strong contribution to said development, so that it soon became the country with the largest number of seismically isolated bridges (over 150 bridges and over 100 km by 1992). The application of passive control techniques in Italian buildings was slow at the beginning; however in last five years, due to the change of seismic code in 2003, many buildings benefited from different types of antiseismic devices. New buildings, in particular strategic buildings such as hospitals, are more and more often protected by seismic isolation, which guarantees their full functionality even immediately after a strong earthquake. Seismic isolation has also been implemented to retrofit existing buildings. More often existing RC framed buildings, in particular schools, have been retrofitted through dissipative bracings, exploiting their capability to reduce the ductility request of structural members and thus the damage. Since the late 1980s, Italian anti-seismic devices have been applied in other countries too -ranging from Mediterranean seismic-prone countries to the USA, from Bangladesh to South America. Some of the outstanding projects in which Italian anti-seismic devices have been used are the Rion-Antirion Bridge in Greece, the Taipei 101 skyscraper in Taipei, the Stonecutters Bridge in Hong Kong, the St. Francis Shangri-La Towers in Manila, etc. Some recent applications of Italian antiseismic devices are described in this paper.

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“…Smith and Willford (2007) proposed a similar outrigger damping system to Jeremlah (2006) and applied the outrigger damping system successfully to a high rise building in the Philippines (Willford et al 2008). …”

Section: Introductionmentioning

confidence: 99%

Semi-active Outrigger Damping System for Seismic Protection of Building Structure

Kim

Kang

2017

Journal of Asian Architecture and Building Engineering

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The outrigger structural system is one of the most widely used lateral load-resisting structural systems for high-rise buildings. To increase the energy dissipation capacity of the outrigger system, an outrigger damping system has been proposed as a novel energy dissipation system. In this system, the outrigger and perimeter columns are separate and vertical viscous dampers are equipped between the outrigger and perimeter columns. In this study, the control performance of a semi-active outrigger damping system for the seismic protection of a building structure was investigated. Semi-active damping devices, such as magnetorheological (MR) dampers instead of passive dampers, are installed vertically between the outrigger and perimeter columns to achieve large and adaptable energy dissipation. A fuzzy logic control algorithm was used to generate a command voltage sent to the semi-active MR dampers. A genetic algorithm was used to optimize the fuzzy logic controller. An artificial earthquake load was generated for the numerical simulation and a simplified numerical model of a damped outrigger system was developed. Numerical analyses showed that the semi-active damped outrigger system could effectively reduce both the displacement and acceleration responses of the tall buildings compared to a passive outrigger damper system.

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The damped outrigger concept for tall buildings

Cited by 196 publications

References 12 publications

Proposed Configurations for the Use of Smart Dampers with Bracings in Tall Buildings

Proposed Configurations for the Use of Smart Dampers with Bracings in Tall Buildings

Recent applications of Italian anti-seismic devices

Semi-active Outrigger Damping System for Seismic Protection of Building Structure

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