Application of Isolation to High-Rise Buildings: A Japanese Design Case Study through a U.S. Design Code Lens

Becker, Tracy C.; Yamamoto, Shunji; Hamaguchi, Hiroki; Higashino, Masahiko; Nakashima, Masayoshi

doi:10.1193/052813eqs136m

Cited by 34 publications

(15 citation statements)

References 10 publications

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“…The guidelines recommended by the Japanese code are relatively clear regarding design of high‐rises with isolation devices. On the contrary, the recommendations prescribed in other design codes, especially in the American standard, make the adoption of isolation systems difficult for high‐rise buildings 11 . The use of base‐isolation systems in Japan has been for more than couple of decades, wherein the target design requires enhanced performance as compared to the general structural design.…”

Section: Design Of Base‐isolation System For High‐rise Buildingmentioning

confidence: 99%

“…The use of base‐isolation devices in high‐rise buildings is widely recognized in Japan, where more than 20% of the super‐high‐rise buildings are base‐isolated, and more than 80% of the base‐isolated buildings are condominium in the Osaka city of Japan 10 . Yet, utilization of this advanced technique is uncommon in most parts of the world, 11 and as a result, research has not been fully explored to investigate the performance of the isolation devices in high‐rise buildings under earthquakes and winds. Initially, Ariga et al 12 investigated the behavior of base‐isolated high‐rise buildings under long‐period ground motions.…”

Section: Introductionmentioning

confidence: 99%

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Multihazard framework for investigating high‐rise base‐isolated buildings under earthquakes and long‐duration winds

Roy

Saito

Matsagar

2020

Earthq Engng Struct Dyn

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Japan experiences a considerable number of low to medium earthquake shocks and long‐duration winds throughout the year, which is relatively more as compared to other different regions of the world. Considering this multihazard scenario, structures designed using the existing guidelines may have significant chances to underestimate the induced distress level in the structure as well as in the energy dissipation devices, which are designed based on traditional peak variables neglecting accumulation of damage. To overcome the shortcoming of the existing assessment technique, a multihazard framework is formulated that deals in estimating probable number of earthquakes and long‐duration winds likely to occur in the design life of a structure. The sequence of design earthquakes and long‐duration winds obtained through the proposed methodology is subsequently implemented in base‐isolated high‐rise buildings of two different heights, which are designed based on Japanese standard. Responses are addressed in terms of displacement and acceleration at isolation and top floor level, force‐deformation and fatigue damage induced in the isolation devices under individual and multihazard scenarios. Results show that a particular range of building exists that is governed by both earthquake and wind events, and it is recommended that design of such building types should include the effects of both hazards. Moreover, the series of events likely to occur in design life of the buildings induce significant damage in the isolators as compared to the individual hazard event, thereby emphasizing a strong need to develop multihazard framework, where the occurrence rate of such extreme events is relatively higher.

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Section: Design Of Base‐isolation System For High‐rise Buildingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multihazard framework for investigating high‐rise base‐isolated buildings under earthquakes and long‐duration winds

Roy

Saito

Matsagar

2020

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…While it may be challenging to incorporate nonlinear bracing systems to the base of RC high‐rise buildings, the application of base isolations for high‐rise buildings has been used in Japan for decades. However, base isolation is still of limited use for high‐rise buildings, due to its reduced effectiveness in period shifting for such structures, as well as the technical challenges related to designing for high tensile and compressive loading that is related to significant OTMs at the base 19–22 . The latter may be alleviated by allowing heavily loaded exterior isolators to uplift, 23 rocking of the core wall system above the isolation layer, 24 or by replacing conventional base isolation systems with an uncoupled rocking and rolling megacolumn base‐mechanism to control both base OTM and shear demands 25 .…”

Section: Introductionmentioning

confidence: 99%

Shear‐controlling rocking‐isolation podium system for enhanced resilience of high‐rise buildings

Zhong

Christopoulos

2022

Earthq Engng Struct Dyn

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Rapid urban growth has been paired with a rapid increase in the demand for high‐rise buildings, and has accelerated the need for developing more resilient high‐rise buildings in earthquake‐prone regions. Current best practices for the seismic design of high‐rise buildings follow a performance‐based design approach that allows the designer to use innovative structural systems, select performance objectives, and verify seismic performances targeted at multiple levels of seismic intensity. As shortcomings in conventional code‐designed high‐rise buildings continue to be revealed by strong earthquakes, the importance of more resilient high‐rise systems is increasingly evident. Several high‐performance systems have been proposed to limit the excessive seismic demands attributed to higher‐mode effects in high‐rise buildings. However, these systems still face design challenges associated with distributed damage and residual deformations. This paper proposes a novel self‐centering base mechanism for high‐rise buildings that independently limits both shear forces and overturning moments at the base to mitigate higher‐mode effects, while eliminating residual deformations and controlling concentrated stresses within the structure that otherwise would need to be designed for. The schematic overview of the proposed system is first introduced, followed by the detailed design of a physical embodiment developed based on a reference 42‐story RC core wall building. Results of a numerical case‐study comparison confirm that an enhanced seismic performance is achieved through the proposed system with minimum damage and negligible residual deformations even following major seismic loading. The proposed system, with further investigations, also has the potential to be applied to a wider range of structural systems.

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“…For flexible (long-period) structures, structures located on soft-soil profiles, and those subjected to near-filed ground motions, the effectiveness of base isolation depends on many parameters such as the relationship between the periods of the non-isolated structure, the isolated counterpart, the dominant period of the ground motion, and the damping provided by the isolation system. In these cases, seismic isolation could still be an effective approach for seismic protection, but design and application of this technique needs particular care [4,[11][12][13][14][15][16]. Several techniques have been developed that can be used to insert base isolation under existing buildings with some additional costs which might be justified, especially in the case of historic buildings with extremely high or even inestimable value (e.g., [17][18][19][20][21][22]).…”

Section: Introductionmentioning

confidence: 99%

Integrated Solution-Base Isolation and Repositioning-for the Seismic Rehabilitation of a Preserved Strategic Building

2021

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This paper deals with the design of the seismic rehabilitation of a case-study building located in Florence, Italy. The particular reinforced concrete building hosts an important operational center of the main company that manages the Italian highway network. It is composed of the juxtaposition of three reinforced concrete edifices standing out from a common basement. The design of the interventions for the seismic rehabilitation of this case study posed different challenges, some even in contrast with each other. The main design challenge was to reach the seismic retrofitting, due to the strategic role of the activities hosted herein, safeguarding as much as possible the peculiarity of the architectural elements. Moreover, the design was made harder by the presence of existing thermal joints between adjacent edifices which were inadequate to prevent the latter from pounding upon each other during an earthquake. This outcome yielded the need to intervene by enlarging the gap between the adjacent buildings. This latter intervention was in stark contrast with the explicit request of the client to bring the least possible disturbance to the strategic activities carried out within it; in fact, the joints are crossed by optical fibers and other technological systems which can be damaged easily. The need to fulfill all these design constraints brought the development of an original design strategy based on the employment of base-isolation in a rather unusual configuration. The details of the design procedure, along with the innovative aspects and the designed devices, are presented. With the objective to refine the adopted strategy in view of its possible repeatability by colleague engineers, the paper also presents a fair discussion of every aspect with regards to both the design and the realization phases. Possible ideas for new research and developments are also highlighted.

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Application of Isolation to High-Rise Buildings: A Japanese Design Case Study through a U.S. Design Code Lens

Cited by 34 publications

References 10 publications

Multihazard framework for investigating high‐rise base‐isolated buildings under earthquakes and long‐duration winds

Multihazard framework for investigating high‐rise base‐isolated buildings under earthquakes and long‐duration winds

Shear‐controlling rocking‐isolation podium system for enhanced resilience of high‐rise buildings

Integrated Solution-Base Isolation and Repositioning-for the Seismic Rehabilitation of a Preserved Strategic Building

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