scholarly journals SHAKING TABLE TESTS ON RESPONSE CHARACTERISTICS OF SEISMIC ISOLATION SYSTEMS FOR HOUSES SUBJECTED TO 3-DIMENSIONAL EARTHQUAKE MOTIONS

2004 ◽  
Vol 69 (578) ◽  
pp. 27-35 ◽  
Author(s):  
Masanori IIBA ◽  
Mitsumasa MIDORIKAWA
Keyword(s):  
Seismic Isolation ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
3 Dimensional ◽  
Response Characteristics ◽  
Isolation Systems ◽  
Seismic Isolation Systems

scholarly journals Experimental Approach for the Failure Mode of Small Laminated Rubber Bearings for Seismic Isolation of Nuclear Components

2021 ◽  
Vol 12 (1) ◽  
pp. 125
Author(s):  
Sang-Jin Ma ◽  
Tae-Myung Shin ◽  
Ju-Seung Ryu ◽  
Jin-Hyeong Lee ◽  
Gyeong-Hoi Koo
Keyword(s):  
Seismic Isolation ◽  
Response Spectrum ◽  
Shaking Table ◽  
Intensity Level ◽  
Shaking Table Tests ◽  
Response Characteristics ◽  
Water Jet Cutting ◽  
Total Failure ◽  
Rubber Bearings ◽  
Partial Damage

Response characteristics of small-sized laminated rubber bearings (LRBs) with partial damage and total failure were investigated. For nuclear component seismic isolation, ultimate response characteristics are mainly reviewed using a beyond design basis earthquake (BDBE). Static tests, 3D shaking table tests, and verification analyses were performed using optional LRB design prototypes. During the static test, the hysteresis curve behavior from buckling to potential damage was observed by applying excessive shear deformation. The damaged rubber surface of the laminated section inside the LRB was checked through water jet cutting. A stress review by response spectrum analysis was performed to simulate the dynamic tests and predict seismic inputs’ intensity level that triggers LRB damage. Shaking table tests were executed to determine seismic response characteristics with partial damage and to confirm the stability of the superstructure when the supporting LRBs completely fail. Shear buckling in LRBs by high levels of BDBE may be quickly initiated via partial damage or total failure by the addition of torsional or rotational behavior caused by a change in the dynamic characteristics. Furthermore, the maximum seismic displacement can be limited within the range of the design interface due to the successive slip behavior, even during total LRB failure.

scholarly journals Comparing Rubber Bearings and Eradi-Quake System for Seismic Isolation of Bridges

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5247
Author(s):  
Chang Beck Cho ◽  
Young Jin Kim ◽  
Won Jong Chin ◽  
Jin-Young Lee
Keyword(s):  
Seismic Isolation ◽  
New Technology ◽  
Isolation System ◽  
Seismic Safety ◽  
Response Characteristics ◽  
Rubber Bearing ◽  
Seismic Force ◽  
Isolation Systems ◽  
Rubber Bearings ◽  
Seismic Isolation Systems

Seismic isolation systems have been used worldwide in bridge structures to reduce vibration and avoid collapse. The seismic isolator, damper, and Shock Transmission Unit (SUT) are generally adopted in the seismic design of bridges to improve their seismic safety with economic efficiency. There are several seismic isolation systems, such as Natural Rubber Bearing (NRB), Lead Rubber Bearing (LRB), and the Eradi-Quake System (EQS). EQS as a new technology is expected to effectively reduce both seismic force and displacement, but there is still some need to verify whether it might provide an economical and practical strategy for a bridge isolation system. Moreover, it is important to guarantee consistent performance of the isolators by quality control. A comparative evaluation of the basic properties of the available seismic isolators is thus necessary to achieve a balance between cost-effectiveness and the desired performance of the bridge subjected to extreme loading. Accordingly, in this study, the seismic response characteristics of the seismic isolation systems for bridges were investigated by conducting compressive test and compressive-shear test on NRB, LRB, and EQS.

Shaking Table Tests on a Spherical Tank Mock-Up Provided With Seismic Isolation and Flexible Piping Connections

2006 ◽  
Author(s):  
Massimo Forni ◽  
Alessandro Poggianti ◽  
Giulia Bergamo ◽  
Fabrizio Gatti
Keyword(s):  
Seismic Isolation ◽  
Shaking Table ◽  
Seismic Protection ◽  
Piping System ◽  
Fiber Reinforced ◽  
Shaking Table Tests ◽  
Fixed Base ◽  
High Damping Rubber ◽  
Isolation Systems ◽  
Rubber Bearings

The Project INDEPTH (Development of INnovative DEvices for Seismic Protection of PeTrocHemical Facilities), supported by the European Commission, has the objective of developing and applying innovative seismic isolation and/or dissipation systems for critical structures at petrochemical facilities. In the framework of INDEPTH, integrated seismic protection systems have been conceived, developed and tested. They are aimed at protecting liquid-filled structures (product storage, spherical and LNG tanks), with new devices (fiber-reinforced isolators, buckling reinforced braces) specific for each application and new flexible piping couplings, to compensate the displacements resulting from the use of isolation systems. The research program has been focused on the selection of critical structures, the design and manufacturing of the devices, the numerical assessment and the experimental validation through shaking table tests [1–4]. A quantification of technical/economical/safety benefits with respect to the conventional state-of-the-art measures presently adopted and potential application to retrofitting has been performed. This paper describes the validation through shaking table tests of the effectiveness of the isolation systems on a spherical mock-up and the related piping system equipped with flexible joints. Different configurations of the mock-up have been tested, such as: fixed base, isolated base with High Damping Rubber Bearings, Fiber Reinforced Rubber Bearings and Lead Rubber Bearings. Furthermore, each configuration has been tested for three different level of filling to verify the sloshing behavior in the sphere and the effectiveness of the isolation systems at filling levels different from the design one (full sphere).

Shaking Table Tests on a Spherical Tank Mock-Up Provided With Seismic Isolation and Flexible Piping Connections

2005 ◽  
Author(s):  
Massimo Forni
Keyword(s):  
Seismic Isolation ◽  
Shaking Table ◽  
Seismic Protection ◽  
Piping System ◽  
Fiber Reinforced ◽  
Shaking Table Tests ◽  
Time Histories ◽  
High Damping Rubber ◽  
Isolation Systems ◽  
Rubber Bearings

The Project INDEPTH (Development of INnovative DEvices for Seismic Protection of PeTrocHemical Facilities), supported by the European Commission, has the objective of developing and applying innovative seismic isolation and/or dissipation devices for critical structures at petrochemical facilities. In the framework of INDEPTH, integrated seismic protection systems have been conceived, developed and tested. They are aimed at protecting liquid-filled structures (product storage, spherical and LNG tanks), with new devices (fiber-reinforced isolators, buckling reinforced braces) specific for each application and new flexible piping couplings, to compensate the displacements resulting from the use of isolation systems. The research program has been focused on the selection of critical structures, the design and manufacturing of the devices, the numerical assessment and the experimental validation through shaking table tests. A quantification of technical/economical/safety benefits with respect to the conventional state-of-the-art measures presently adopted and potential application to retrofitting has been performed. Validation through shaking table tests of the effectiveness of the isolation systems on the spherical mock-up (Figure 1), and the related piping system equipped with flexible joints (Figure 2), had been performed. Two types of seismic input have been applied, both synthesized from the 5% damping spectra of EC8 (medium and soft soils); the target peak acceleration value of the time histories was 0.4 g. Different configurations of the mock-up have been tested, such as: fixed base, isolated base with High Damping Rubber Bearings, Fiber Reinforced Rubber Bearings and Lead Rubber Bearings. Furthermore, each configuration has been tested for both time histories and at three different level of filling to verify the sloshing behavior in the sphere and the effectiveness of the isolation systems at levels of filling different from the design one (full sphere). Comparison among all the above mentioned conditions could be done. The presentation will show the main results of the shaking table campaign.

Analyses of Seismic Isolation Systems in Kyrgyzstan

2002 ◽  
Author(s):  
Tynymbek O. Ormonbekov ◽  
Ulugbek T. Begaliev
Keyword(s):  
Active Zone ◽  
Seismic Isolation ◽  
Seismic Protection ◽  
Kyrgyz Republic ◽  
Isolation Systems ◽  
Seismic Isolation Systems

The purpose of the present work is the analysis of existing methods of seismoisolation in the Kyrgyz Republic at which 95% of territory has seismically active zone with intensity 8, 9 and more. Also an opportunity of application of system seismic protection as rubber-metal bearings.

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