scholarly journals Nonlinear dynamic analysis of a structure with a friction-based seismic base isolation system

2007 ◽  
Vol 50 (3) ◽  
pp. 523-538 ◽  
Author(s):  
H. M. R. Suy ◽  
R. H. B. Fey ◽  
F. M. B. Galanti ◽  
H. Nijmeijer
Keyword(s):  
Dynamic Analysis ◽  
Nonlinear Dynamic ◽  
Base Isolation ◽  
Nonlinear Dynamic Analysis ◽  
Isolation System ◽  
Base Isolation System ◽  
Seismic Base Isolation

A New Passive Seismic Control Device for Protection of Structures under Anomalous Seismic Events

2011 ◽  
Vol 82 ◽  
pp. 651-656 ◽  
Author(s):  
Donato Cancellara ◽  
Mario Pasquino
Keyword(s):  
Dynamic Analysis ◽  
Nonlinear Dynamic ◽  
Base Isolation ◽  
Nonlinear Dynamic Analysis ◽  
Control Device ◽  
Hysteretic Behavior ◽  
Isolation System ◽  
Seismic Control ◽  
Seismic Isolator ◽  
Seismic Force

In this paper, the possibility offered by the Base Isolation System, designed according to the strategy of limitation seismic force, in order to ensure a significant level of robustness to the isolated superstructure, has been analyzed. In according to the strategy of limitation seismic force, a new seismic isolator called HDHSI (High Damping Hybrid Seismic Isolator) is proposed, obtained by the assembly in series of a LRB (Lead Rubber Bearing) and a FS (Friction Slider) with high friction coefficient. The HDHSI device is in contrast to the R-FBI (Resilient-Friction Base Isolation) isolator and is the optimization of the EDF (Electricité De France) system. A modeling with HDHSI devise has been presented by using nonlinear finite elements NLlink (Nonlinear link) and nonlinear dynamic analysis for a SDOF system with harmonic force, in order to characterize the cycle-hysteretic behavior of the device for different levels of shear deformation, are performed. Nonlinear dynamic analysis for a RC structure, base isolated by the proposed devices, are performed. As seismic actions, have been adopted the following registrations: an anomalous earthquakes for intensity and in particular El Centro earthquake (N00W component, 1940) with different amplification factors; an anomalous earthquake for frequency content and in particular Erzincan earthquake (N90W component, 1992).

scholarly journals PENGARUH PENGGUNAAN SEISMIC BASE ISOLATION SYSTEM TERHADAP RESPONS STRUKTUR GEDUNG HOTEL IBIS PADANG.

2012 ◽  
Vol 8 (1) ◽  
pp. 45
Author(s):  
Febrin Anas Ismail
Keyword(s):  
Base Isolation ◽  
Isolation System ◽  
Base Isolation System ◽  
Seismic Base Isolation

Sumatera Barat merupakan daerah rawan gempa. Hal ini dikarenakan daerah sumatera barat terletak di zona subduksi dan zona transformasi yang akan sering menimbulkan gempa bumi. Terjadinya gempa bumi dapat mengakibatkan terjadinya kerusakan pada gedung. Kerusakan tersebut dapat berupa kerusakan elemen non-struktural seperti kerusakan dinding maupun kerusakan elemen struktural seperti balok dan kolom, hingga terjadinya kegagalan struktur yang menyebabkan robohnya bangunan. Pasca gempa 30 September 2009 yang lalu, banyak bangunan bertingkat, bangunan pemerintah maupun swasta mengalami rusak berat. Salah satu contoh gedung tersebut adalah rubuhnya hotel ambacang dan kerusakan berat pada hotel bumi Minang. Untuk mengurangi kerusakan yang diakibatkan oleh gempa bumi, biasanya bangunan diperkuat dengan meningkatkan kekuatan/kekakuan bangunan. Pendekatan lain adalah dengan menggunakan sistem “seismic base isolation system” yaitu suatu sistem yang fleksibel dimana kekakuan bangunan diisolasi dari pondasi di atas tanah sehingga mengurangi aliran “shock” dari gempa ke bangunan di atasnya. Pada penelitian ini mengkaji pengaruh penggunaan seismic base isolation system pada gedung Hotel ibis Padang. Pengaruh yang ditinjau adalah respons struktur gedung terhadap beban gempa. Respon struktural yang menjadi objek adalah gaya dalam dan perpindahan/ displacement Struktur dan lantai. Hal ini dimaksudkan untuk mengetahui berapa besar reduksi gaya dalam dan perpindahan dengan penggunaan seismic base isolation system. Keywords: gempa, kerusakan gedung akibat gempa, seismic base isolation system, respon struktur

Improvement of the polyurethane spring isolation device for HV post insulators and its evaluation by fragility curves

2021 ◽  
pp. 875529302098196
Author(s):  
Tansu Gökçe ◽  
Engin Orakdöğen ◽  
Ercan Yüksel
Keyword(s):  
Seismic Isolation ◽  
Base Isolation ◽  
Numerical Models ◽  
Fragility Curves ◽  
Low Cost ◽  
Steel Plates ◽  
Isolation System ◽  
Base Isolation System ◽  
Isolation Device ◽  
Seismic Base Isolation

A novel seismic base isolation system has been developed for high-voltage (HV) porcelain post insulators. The seismic isolation device consists of two steel plates, four polyurethane springs, and a steel rod, which are low-cost components compared to the post insulators. Two alternative designs of the device are experimentally and numerically assessed in this article. A simple and robust numerical model consisting of linear line elements and nonlinear springs was generated, and subsequently validated using the experimental results. Incremental dynamic analyses (IDAs) were then performed to obtain fragility curves. Ten historical earthquake profiles, scaled to intensities between 0.1 and 2.0 g, were then applied to the numerical models. The fragility curves, generated according to the latest version of IEEE-693, demonstrate that the seismic isolation devices are highly effective in diminishing the base moment of the porcelain insulator. It should be noted that relatively large displacements at the top of the pole must be accounted for by ensuring adequate slackness in the flexible conductors.

A Novel Seismic Base Isolation System Consisting of a Lead Rubber Bearing in Series with a Friction Slider. Part I: Nonlinear Modeling of the System

2012 ◽  
Vol 256-259 ◽  
pp. 2185-2192
Author(s):  
Donato Cancellara ◽  
Fabio de Angelis ◽  
Mario Pasquino
Keyword(s):  
Base Isolation ◽  
Nonlinear Modeling ◽  
Isolation System ◽  
Nonlinear Finite Elements ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
Base Isolator ◽  
Base Isolation System ◽  
In Series ◽  
Seismic Base Isolation

In this paper a new seismic base isolator, called High Damping Hybrid Seismic Isolator (HDHSI), is proposed. It is obtained by the assembly in series of a Lead Rubber Bearing (LRB) and a Friction Slider (FS) with a high friction coefficient. The HDHSI device is in contrast with the Resilient-Friction Base Isolator (R-FBI) with the aim of optimizing the Electricité De France (EDF) system. The mathematical model of a structure base isolated by a HDHSI system is analyzed with a two Degree of Freedom System (2-DOF) in which the superstructure is assimilated to a rigid body. Nonlinear finite elements are adopted for modeling the HDHSI device. A dynamic nonlinear analysis is performed and the hysteretic cycles are derived and evaluated for the single components and for the innovative HDHSI device.

URANUS: Korean Lead-Bismuth Cooled Small Modular Fast Reactor Activities

2011 ◽  
Author(s):  
Sungyeol Choi ◽  
Il Soon Hwang ◽  
Jae Hyun Cho ◽  
Chun Bo Shim
Keyword(s):  
Fast Reactor ◽  
Nuclear Power ◽  
Base Isolation ◽  
Cooling System ◽  
Natural Circulation ◽  
High Level Waste ◽  
Isolation System ◽  
Base Isolation System ◽  
Enriched Uranium ◽  
Seismic Base Isolation

Since 1994, Seoul National University (SNU) has developed an innovative future nuclear power based on LBE cooling advanced Partitioning and Transmutation (P&T) approach that leaves no high-level waste (HLW) behind with transmutation reactor named as Proliferation-resistant, Environment-friendly, Accident-tolerant, Continual, and Economical Reactor (PEACER). A small modular lead-bismuth cooled reactor has been designated as Ubiquitous, Robust, Accident-forgiving, Nonproliferating and Ultra-lasting Sustainer (URANUS-40) with a nominal electric power rating of 40 MW (100 MW thermal) that is well suited to be used as a distributed power source in either a single unit or a cluster for electricity, heat supply, and desalination. URANUS-40 is a pool type fast reactor with and an array of heterogeneous hexagonal core, fueled by proven low-enriched uranium dioxide fuels. The primary cooling system is designed to be operated by natural circulation. 3D seismic base isolation system is introduced underneath the entire reactor building allowing an earthquake of 0.5g zero period acceleration (ZPA) for the Safe Shutdown Earthquake (SSE). Also, the proliferation risk can be effectively managed by capsulized core design and a long refueling period (25yr).

scholarly journals Development of active seismic base isolation system with mechanical controller (Proposal of the concept, demonstration experiment and parameter study)

2015 ◽  
Vol 81 (823) ◽  
pp. 14-00450-14-00450 ◽  
Author(s):  
Yasuo AOKI ◽  
Akinori HIRAMATSU ◽  
Tempai WACHI ◽  
Takashi AOKI ◽  
Kouichi KAJIWARA ◽  
...  
Keyword(s):  
Base Isolation ◽  
Parameter Study ◽  
Isolation System ◽  
Demonstration Experiment ◽  
Base Isolation System ◽  
Seismic Base Isolation

On Development of a New Seismic Base Isolation System

2012 ◽  
pp. 574-581 ◽  
Author(s):  
Sanjukta Chakraborty ◽  
Koushik Roy ◽  
Chetan Chinta Arun ◽  
Samit Ray Chaudhuri
Keyword(s):  
Base Isolation ◽  
Isolation System ◽  
Base Isolation System ◽  
Seismic Base Isolation
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