Earthquake Observation Record in the Building Using Three-Dimensional Seismic Base Isolation System

2012 ◽  
Author(s):  
Tetsuya Tomizawa ◽  
Osamu Takahashi ◽  
Junji Suhara ◽  
Keiichi Okada ◽  
Yasuo Tsuyuki ◽  
...  
Keyword(s):  
Base Isolation ◽  
Three Dimensional ◽  
Isolation System ◽  
Base Isolation System ◽  
Earthquake Observation ◽  
Seismic Base Isolation

Dynamic Nonlinear Analysis of an Hybrid Base Isolation System with Viscous Dampers and Friction Sliders in Parallel

2012 ◽  
Vol 234 ◽  
pp. 96-101 ◽  
Author(s):  
Donato Cancellara ◽  
Fabio de Angelis
Keyword(s):  
Nonlinear Analysis ◽  
Base Isolation ◽  
Three Dimensional ◽  
Time History ◽  
Seismic Action ◽  
Viscous Dampers ◽  
Isolation System ◽  
Fixed Base ◽  
Base Isolation System ◽  
Dynamic Nonlinear Analysis

In the present work we have analyzed a particular base isolation system for the seismic protection of a multi-storey reinforced concrete (RC) building. The viscous dampers and friction sliders are the devices adopted in parallel for realizing the base isolation system. The base isolation structure has been designed and verified according to European seismic code EC8 and by considering for the friction sliders the influence of the sliding velocity on the value of the friction coefficient. A dynamic nonlinear analysis for a three-dimensional base isolated structure has been performed. Recorded accelerograms for bi-directional ground motions have been used which comply with the requirements imposed by EC8 for the representation of a seismic action in a time history analysis. In this paper a comparative analysis is presented between the base isolated structure with the described hybrid base isolation system and the traditional fixed base structure.

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

Three Dimensional Seismic Isolation System for Next-Generation Nuclear Power Plant With Rolling Seal Type Air Spring and Hydraulic Rocking Suppression System

2005 ◽  
Author(s):  
Takahiro Shimada ◽  
Junji Suhara ◽  
Kazuhiko Inoue
Keyword(s):  
Dynamic Loading ◽  
Nuclear Power ◽  
Seismic Isolation ◽  
Base Isolation ◽  
Three Dimensional ◽  
Loading Test ◽  
Isolation System ◽  
Ability Test ◽  
Base Isolation System ◽  
Suppression System

Three dimensional (3D) seismic isolation devices have been developed to use for the base isolation system of the heavy building like a nuclear reactor building. The developed seismic isolation system is composed of rolling seal type air springs and the hydraulic type springs with rocking suppression system for vertical base isolation device. In horizontal direction, the same laminated rubber bearings are used as horizontal isolation device for these systems. The performances and the applicability have already been evaluated by the technical feasibility tests and performance tests for each system. In this study, it was evaluated that the performance of the 3D base isolation system with rolling seal type air springs combined with hydraulic rocking suppression devices. A 1/7 scaled model of the 3D base isolation devices were manufactured and some performance test were executed for each device. For the rolling seal type air springs, dynamic loading test was executed with a vibration table, and pressure resistant ability test was executed for reinforced air springs. In the dynamic loading test, it is confirmed that the natural period and damping performance were verified. In the pressure resistant ability test, it is confirmed that the air springs had sufficient strength. For the hydraulic rocking suppression system, forced dynamic loading test was carried out in order to measure the frictional and oil flow resistance force on each cylinder. And the vibration table tests were carried out with supported weight of 228 MN in order to evaluate and to confirm the horizontal and vertical isolation performance, rocking suppression performance, and the applicability of the this seismic isolation system as the combined system. 4 rolling seal type air springs and 4 hydraulic load-carrying cylinders with rocking suppression devices supported the weight. As a result, the proposed system was verified that it could be applied to the actual nuclear power plant building to be target.

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).

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