Seismic response reduction of high rise steel-concrete composite buildings equipped with base isolation system

Reduction of seismic response of mechanical system is important problem for aseismic design. Some types of base isolation systems are developed and used in actual base of buildings and floors in buildings for reduction of seismic response of mechanincal system. In this paper, a base isolation system utilizing bearing with friction and restoring force of bearing is proposed. Friction bearing consists of two plates having spherical concaves and oval type metal or spherical metal with rubber. First, effectiveness of the base isolation system is examined experimentally. Using artificial time histories, the isolated table is shaken on the shaking table. The maximum value of response is reduced and sum of squares of response is significantly reduced. Power spectrum is significantly reduced in almost of all frequency regions, except for very low frequency region. Next, in order to examine reduction of seismic response of actual mechanical system, a console rack is set on the isolated plate. Seismic response is also significantly reduced. Finally, obtained results of experiment are examined by simulation method. An analytical model considering friction and restoring force is used. From simulation method, effectiveness of the proposed base isolation system is demonstrated.

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Research on Seismic Response of Base-Isolated Nuclear Island Building considering FSI Effect of PCS Water Tank

Advances in Civil Engineering ◽

10.1155/2020/8878507 ◽

2020 ◽

Vol 2020 ◽

pp. 1-15

Author(s):

Chenning Song ◽

Chao Wei ◽

Zhi Zhang

Keyword(s):

Seismic Response ◽

Base Isolation ◽

Numerical Models ◽

Horizontal Displacement ◽

Reduction Ratio ◽

Isolation Effect ◽

Water Tank ◽

Isolation System ◽

Base Isolation System ◽

Natural Frequency Analysis

Base isolation can be used to reduce seismic response of structure and protect the structure from damage subjected to earthquake. To study the isolation effect of new PWR nuclear power plant with a base isolation system, considering FSI (fluid-structure interaction) effect by the simplified model, two 3D numerical models (one nonisolated model and one isolated model) were established. After natural frequency analysis, one artificial ground motion was chosen to analyze isolation effect qualitatively. Based on the results, the accelerations and relative displacements of nuclear island building under ten natural ground motions were statistically analyzed to evaluate the isolation effect quantitatively. The results show that the base isolation system can reduce the natural frequencies of nuclear island building. Horizontal accelerations can be reduced effectively, but the isolation effect is not obvious in vertical direction. The acceleration reduction ratio of the top is about 70%–90%, and the acceleration reduction ratio of the lower part is about 20%–60%. Horizontal displacement of the isolated model is far larger than that of the nonisolated model, and horizontal displacement will become larger considering FSI effect. These conclusions could provide some references for studies on the isolation system of nuclear island building.

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Active-passive base isolation system for seismic response controlled structures

10.2514/6.1995-1088 ◽

1995 ◽

Cited By ~ 2

Author(s):

Murat Sener ◽

Senol Utku

Keyword(s):

Seismic Response ◽

Base Isolation ◽

Isolation System ◽

Base Isolation System ◽

Controlled Structures

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Base isolation system and seismic response control system of building structures.

JOURNAL OF THE JAPAN WELDING SOCIETY ◽

10.2207/qjjws1943.57.564 ◽

1988 ◽

Vol 57 (8) ◽

pp. 564-574

Author(s):

Yutaka Inoue

Keyword(s):

Control System ◽

Seismic Response ◽

Base Isolation ◽

Building Structures ◽

Response Control ◽

Isolation System ◽

Seismic Response Control ◽

Base Isolation System

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A new form of steel base isolation system for seismic high-rise building

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/732/1/012010 ◽

2020 ◽

Vol 732 ◽

pp. 012010

Author(s):

T Rochman ◽

N Rasidi ◽

S Sumardi ◽

F Purnomo

Keyword(s):

Base Isolation ◽

Isolation System ◽

High Rise ◽

High Rise Building ◽

Steel Base ◽

Base Isolation System ◽

New Form

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21112 Vibration analysis of small base isolation system using friction bearings : Effects of eccentricity on seismic response

The Proceedings of Conference of Kanto Branch ◽

10.1299/jsmekanto.2013.19.519 ◽

2013 ◽

Vol 2013.19 (0) ◽

pp. 519-520

Author(s):

Katsumi Kurita ◽

Shigeru Aoki ◽

Yuji Nakanishi ◽

Kazutoshi Tominaga ◽

Mitsuo Kanazawa ◽

...

Keyword(s):

Seismic Response ◽

Vibration Analysis ◽

Base Isolation ◽

Isolation System ◽

Base Isolation System ◽

Small Base ◽

Friction Bearings

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Influence of the Strain Hardening of HDRBs in the Evaluation of the Seismic Response of a RC Base Isolated Structure

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.602-604.1546 ◽

2012 ◽

Vol 602-604 ◽

pp. 1546-1554

Author(s):

Donato Cancellara ◽

Fabio de Angelis ◽

Mario Pasquino

Keyword(s):

Strain Hardening ◽

Seismic Response ◽

Base Isolation ◽

Cyclic Behavior ◽

Hysteretic Model ◽

Isolation System ◽

Limit Value ◽

Hardening Effect ◽

Base Isolation System ◽

Rubber Bearings

In this paper we have analyzed the influence of the strain hardening behavior of High Damping Rubber Bearings (HDRBs) adopted for a base isolation system of a Reinforced Concrete (RC) isolated structure. For the modeling of the rubber isolators we have adopted an evolution of the Bouc-Wen’s hysteretic model taking into account the incremental hardening effect which appears when the shear strain of the HDRB exceeds the limit value around 100% usually adopted in design practice. The incremental hardening effect is sometimes neglected in the design but it is an important aspect because it ensures a seismic protection of the base isolated structure also in presence of exceptional seismic events for intensity or frequency content. In this paper we have highlighted the significant influence of this phenomenon in the seismic response of the isolated structure by reporting the cyclic behavior of a HDRB respectively neglecting and considering this aspect.

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