An Innovative Application of Base Isolation Technology

Dutta, Anindya; Sumnicht, John F.; Mayes, Ronald L.; Hamburger, Ronald O.; Citipitioglu, Ahmet

doi:10.1061/41084(364)77

Cited by 7 publications

(4 citation statements)

References 1 publication

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“…Some examples are the Iidiabashi 1st Building, Shiodome Sumitomo Building, Nakanoshima Festival Tower, Tekko Building, and Roppongi Ground Tower [2,3,[6][7][8][9][10]. Only in a few cases has the IIS has been adopted for expanding vertically existing buildings, as in Berry St. in San Francisco, USA [11,12], and the Musashino City Disaster Prevention and Safety Centre in Tokyo, Japan [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…This paper examines the interesting idea of utilizing the IIS to extend vertically existing buildings for addressing the increasing demand for real estate in contemporary cities with almost no land take [2,3,11,12,[31][32][33][34][35][36][37]. In earthquake-prone zones, IIS can prevent any increase in seismic effects, despite the increase in mass due to the vertical extension.…”

Section: Introductionmentioning

confidence: 99%

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Intermediate Isolation System with Nonlinear Lower Structure and Isolation System

et al. 2023

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This paper reports a study on the Intermediate Isolation System (IIS) applied to existing buildings. This kind of application is particularly suitable when a vertical addition is planned for buildings in seismic zones; in such a case, an isolation system can be placed at the base of the extension to prevent the increase, or, better, to reduce the seismic demand on the existing structure. In previous works, parametric response spectrum analyses have been carried out on lumped mass models by varying the period of the isolation system. As a result, a sort of IIS design spectrum has been derived and used for selecting design solutions for the vertical extension that minimize the overall seismic response. In this paper, the above design indications are assessed in the light of nonlinear time history analyses, accounting for the hysteretic response of the existing structure and the nonlinear behaviour of the isolation system. The IIS configurations are analysed and the results are discussed and compared in terms of peak response. In light of the obtained analysis results, the effectiveness and robustness of IIS applications for vertical extensions are discussed, and design implications are suggested.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Intermediate Isolation System with Nonlinear Lower Structure and Isolation System

et al. 2023

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“…Some examples of inter-storey isolation are as follows: the Shiodome Sumitomo Building (Tasaka et al 2008) and the Iidabashi First Building (Zhang et al 2017) in Tokyo, which are two multipurpose high-rise buildings consisting of a substructure and superstructure with different structural shapes; a building complex in Beijing (Zhou et al 2004), where 50 base-isolated residential buildings (seven-or nine-storey RC frames) were built on top of a two-storey platform, covering a railway area of ∼3 km 2 ; the 185 Berry St. building in the China Basin area of San Francisco (Dutta et al 2009), which is the first example in the U.S. of an isolated building (two-storey steel structure) built on top of an existing building (three-storey RC structure); the nine-storey pre-cast RC building in the National Taiwan University campus (Loh et al 2013), which has an inter-storey isolation system between the second and third floors, also equipped with viscous dampers.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of optimal FVDs for inter-storey isolation systems based on surrogate performance models

Donà

Bernardi

Zonta

et al. 2021

Bull Earthquake Eng

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Inter-storey seismic isolation is increasingly gaining attention. One of the main related issues is the need to limit the relative displacement between substructure and superstructure, while maintaining a good seismic performance of the superstructure. As shown in some studies, fluid viscous dampers (FVDs) mounted in isolation systems are effective in reducing isolator deflection but can be harmful by amplifying inter-storey drifts and floor accelerations. Additionally, the effectiveness of FVDs for inter-storey applications was investigated only recently, and specific approaches for their optimisation and performance evaluation are missing. Therefore, this paper proposes a method for the optimal multi-objective design of FVDs, based on the definition of appropriate surrogate response models, which allows for rationally comparing the FVD effects for a wide range of dampers and structures. In particular, the optimal FVD parameters are provided in a dimensionless form, so that they can be predicted by design equations of general validity within the range of the structures analysed. This method is applied to a stock of regular structures with various vibration periods of superstructure, isolation and substructure, examining a linear and a non-linear isolation system and a set of natural records, in order to comprehensively assess the effects of FVDs and their non-linearity on the seismic performance of these structures. Finally, prediction models of optimal FVD parameters are provided based on the results obtained and are applied to three case studies as an example.

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“…In addition, midlevel seismic isolation systems can provide more architectural flexibility, needed in multi‐use applications where office space is combined with condominium or hotel space, because transitions between different structural systems are common in these types of applications. In this same vein, midlevel isolation can facilitate the addition of new stories on top of existing buildings while minimally increasing seismic demands on the existing building structure .…”

Section: Introductionmentioning

confidence: 99%

Hybrid shake table testing method: Theory, implementation and application to midlevel isolation

Schellenberg

Becker

Mahin

2016

Struct. Control Health Monit.

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A 2 m by 6 m unidirectional shake table was constructed at the University of California, Berkeley and combined with a real-time hybrid simulation system creating a hybrid shake table. A series of tests were carried out to examine the viability of real-time hybrid simulation techniques to perform experimental simulations of buildings with midlevel seismic isolation. The isolation system and superstructure were physically tested on the table while the portion of the building below the isolation plane was numerically modeled. OpenFresco was used to interface the numerical model with the control system. The isolated superstructure consisted of a two-story steel moment frame on six triple friction pendulum bearings, which exhibit significant nonlinear velocity-dependent behavior, necessitating real-time testing. Shear building models with a range of periods were used to represent the portion of the building below the isolation plane. Increasing the number of degrees of freedom increased the control difficulty as higher modes were excited in the numerical model because of experimental errors caused predominantly by feedback noise and table tracking. Nonetheless, the results illustrate that hybrid shake table tests are indeed an economical and reasonably accurate method to assess the seismic behavior of midlevel isolation systems installed in a range of building configurations. Results showed that midlevel isolation was beneficial for the superstructure and, to a smaller extent, the substructure. However, to achieve maximum benefits, it is recommended that the effective period of the isolation system be sufficiently longer than the period of the substructure.

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An Innovative Application of Base Isolation Technology

Cited by 7 publications

References 1 publication

Intermediate Isolation System with Nonlinear Lower Structure and Isolation System

Intermediate Isolation System with Nonlinear Lower Structure and Isolation System

Evaluation of optimal FVDs for inter-storey isolation systems based on surrogate performance models

Hybrid shake table testing method: Theory, implementation and application to midlevel isolation

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