scholarly journals USED TIRE AS BASE ISOLATOR TIRE FOR EARTHQUAKE RESISTANT HOUSES

2011 ◽  
Vol 7 (1) ◽  
pp. 37
Author(s):  
Inggemar Särfors
Keyword(s):  
Base Isolation ◽  
Load Ratio ◽  
Earthquake Resistance ◽  
Horizontal Load ◽  
Hydraulic Jack ◽  
Earthquake Energy ◽  
Base Isolator ◽  
Earthquake Resistant ◽  
Earthquake Load ◽  
Better Than

The investigation of foundation on tires for absorbing the earthquake energy on houses structure is described here. The foundations are cut cone in shape. There are two tests have been conducted to investigate the shaking energy absorption. First, the foundation is placed on the sand filled tire. The second one, the double tires support round foundation. For comparison purpose, the foundation on sand test without tire is also conducted. The laboratory tests are performed using double hydraulic jack to generate the applied loads. The first jack is used to give the vertical load on the top of foundation to simulate the house load. The other jack is used to produce the load in the horizontal direction to replicate the earthquake load. The results of the tests are plotted in the terms of horizontal load and displacement corves. The double tires foundation shows the higher horizontal displacement-load ratio compared to the others. It indicates that the double tire based foundation absorbing the earthquake energy better than the others. It is concluded that the tired based foundation can be installed to support in the earthquake resistant houses. Keywords: foundation, earthquake resistance, base isolation

Dynamic Analysis of the Base Isolator Structure

2010 ◽  
Vol 143-144 ◽  
pp. 832-836
Author(s):  
Ying Li Liu ◽  
Chun Miao Li ◽  
Te Liang Yan
Keyword(s):  
Base Isolation ◽  
New Technology ◽  
Time History ◽  
Social Benefits ◽  
Earthquake Response ◽  
Computing Model ◽  
Base Isolator ◽  
Earthquake Resistant ◽  
Realistic Significance ◽  
Base Isolators

Isolators are included in the new earthquake-resistant standard. This article analyses some questions on base-isolators and presents a non-linear dynamic computing-model for the time-history. A corresponding computer program is also compiled. With the program, the earthquake response of a isolated structure including the displacement, acceleration and the shear force of each floor are calculated and compared with those of the same structure without base-isolation. It has been found that base-isolation has important realistic significance in mitigating earthquake disaster effectively and has enormous economic and social benefits. Therefore it is a kind of extremely popularizing and applying new technology.

scholarly journals Pengaruh Penggunaan Base Isolation High Damping Rubber Bearing Pada Struktur Beton Bertulang

2020 ◽  
Vol 6 (2) ◽  
pp. 181-194
Author(s):  
Syahnandito ◽  
Reni Suryanita ◽  
Ridwan
Keyword(s):  
Base Isolation ◽  
Isolation System ◽  
Rubber Bearing ◽  
High Damping Rubber Bearing ◽  
Base Isolator ◽  
Base Isolation System ◽  
High Damping Rubber

Salah satu cara yang dapat dilakukan adalah menggunakan peredam beban gempa dengan sistem isolasi dasar (base isolation system). Penggunaan base isolation system  pada bangunan dapat mengisolasi perambatan getaran akibat gempa dari tanah ke struktur atas bangunan menggunakan komponen berbahan karet. Tujuan penelitian ini adalah untuk menganalisis pengaruh penggunaan sistem isolasi dasar berupa High Damping Rubber Bearing pada periode dan gaya geser dasar  struktur beton bertulang. Objek penelitian adalah bangunan hotel 15 lantai dengan ketinggian 62,9 m. Penelitian diawali dengan pemodelan struktur menggunakan aplikasi ETABS v2016 sehingga didapatkan periode dan gaya geser dasar struktur fixbase. Tahap selanjutnya memberikan gaya pada model struktur dengan isolasi dasar High Dumper Rubber Bearing sehingga didapatkan periode dan gaya geser dasar struktur dengan base isolator. Hasil analisis pada struktur fixbase didapatkan periode sebesar 4,212 detik, dengan gaya geser dasar didapatkan sebesar 1470,725 ton. Sedangkan hasil analisis pada struktur dengan base isolator didapatkan periode sebesar 5,500 detik, dengan gaya geser dasar didapatkan sebesar 1286,071 ton. Maka dapat disimpulkan bahwa pada struktur dengan base isolator terjadi peningkatan periode sebesar 30,58 %, sedangkan gaya geser dasar terjadi penurunan 12,56 %.

A Characteristic Seismic Study and Development of Earthquake Resistant Techniques in Existing Structures

2014 ◽  
Vol 983 ◽  
pp. 396-399
Author(s):  
Mochida Yasuhide ◽  
Hanumantharayappa Yashwanth
Keyword(s):  
Base Isolation ◽  
Cost Ratio ◽  
Safety Measures ◽  
Characterization Methods ◽  
Existing Structures ◽  
Isolation Techniques ◽  
Earthquake Resistant ◽  
Temporary Support ◽  
Quality Check ◽  
Geotechnical Risk

The characteristic methods involved in underpinning construction are studied in this research. The analysis of the structure is performed with respect to the geotechnical risk and possible retrofitting techniques. In the past several decades, a number of studies mainly focused on base isolation techniques to preserve the structure, but the merits of underpinning technique, geotechnical risk involved, temporary support for safety measures and cost ratio induced were unexpressed. The second generation of research evaluates the measure to reduce ground risk with characterization methods and detailed quality check through construction management system. Current research has pointed out the crucial features of underpinning construction process and its scope in restricted locations and geotechnical perils.

SCALING LAW OF EARTHQUAKE ENERGY: A MODIFICATION IN THE VIEW OF BROAD FREQUENCY BAND

Fractals ◽  
1994 ◽  
Vol 02 (04) ◽  
pp. 583-588 ◽  
Author(s):  
ZHONGLIANG WU ◽  
YUAN GAO
Keyword(s):  
Frequency Band ◽  
Scaling Law ◽  
Earthquake Energy ◽  
Broad Frequency Band ◽  
Better Than

We analyzed the NEIC broadband energy catalogue and found that the scaling law of earthquake energy deduced from Gutenberg-Richter's law is not valid. The analysis of broadband energy, however, shows a scaling law even better than expected from "classical magnitudes".

scholarly journals ANALISIS KOMPARASI RASIO KAPASITAS KOLOM GEDUNG BERTINGKAT RENDAH PADA 23 KABUPATEN DI PROVINSI ACEH BERDASARKAN SNI 03-1726-2002 DAN SNI 03-1726-2012

2018 ◽  
Vol 1 (4) ◽  
pp. 184-191
Author(s):  
Fakhrurrazi Fakhrurrazi ◽  
Taufik Saidi ◽  
Muttaqin Muttaqin
Keyword(s):  
Earthquake Resistance ◽  
Building Structures ◽  
Building Structure ◽  
Earthquake Intensity ◽  
Minimum Reinforcement ◽  
Aceh Province ◽  
Rock Bed ◽  
Earthquake Load ◽  
The Government ◽  
Earthquake Resilience

In 2002, through the national standardization agency, the Indonesian government issued SNI 03-1726-2002 on Earthquake Resilience Planning Standard for Building Structure to anticipate the effects of earthquake on building. However, after the standard has been issued there have been several other major earthquakes that rendered it necessary to revise the existing standards. Therefore, in 2012 the government issued SNI 03-1726-2012 on Procedures for Earthquake Resistance Planning for Building and Non Building Structures. When viewed from both these standards, it can be seen that Aceh province is one of the provinces with high earthquake intensity so it is necessary to do a research to observe the effect of changes of both standards to the ratio of column capacity and minimum reinforcement requirements for buildings constructed in Aceh province. Based on the results of the research, the average column capacity ratio against the load in SNI 03-1726-2012 has increased by 45.02% and the average minimum reinforcement requirement available is only 54.5%. The increase is due to an increase in primacy factor from 1.0 to 1.5, causing increased structural load. In addition, there was an increase in the combined burden in the form of 30% additional redundant factors as well as the addition of earthquake load due to an increase in rock bed acceleration factors in some regencies. Thus it can be concluded that the building under review has not fulfilled the requirements of SNI 03-1726-2012 and is recommended for planning by adding a shear wall to reduce the structural load.

scholarly journals Dynamic tests on laminated rubber bearings

1977 ◽  
Vol 10 (3) ◽  
pp. 143-150
Author(s):  
R. G. Tyler
Keyword(s):  
Shear Strain ◽  
Base Isolation ◽  
Torsional Oscillation ◽  
Dynamic Mode ◽  
Dynamic Tests ◽  
Earthquake Resistant ◽  
Rubber Bearings

Simulated dynamic tests in shear on laminated rubber bearings are described. The purpose of the tests was to check the performance of the bearings when used as mounts for base isolating buildings against earthquake attack. Over 1,000 cycles were applied to the bearings, mostly at
 50% shear strain at a frequency in the range 0.2 to 0.9Hz. Values of damping were checked by carrying out separate torsional oscillation tests. It is concluded that the bearings are suitable for use in the dynamic mode for the purpose of achieving base isolation in earthquake resistant buildings. Damping is likely to be 2 to 3% of critical. Possibly greater values occur at faster speeds and under cold conditions. The use of separate lead or steel damping elements to prevent the build-up of damaging horizontal oscillations is considered necessary.

scholarly journals Influence at Mass of the Base Isolation System in Affecting the Higher Modes of Vibration

2021 ◽  
Vol 12 (2) ◽  
pp. 1809-1815
Author(s):  
Cici Jennifer Raj J, Et. al.
Keyword(s):  
Seismic Waves ◽  
Base Isolation ◽  
Mode Shapes ◽  
Isolation System ◽  
Higher Modes ◽  
Remarkable Effect ◽  
Base Isolator ◽  
Key Factor ◽  
Modes Of Vibration ◽  
Base Isolation System

Base Isolation is a technology of mitigating the effects due to earthquakes with the aspect of dissipating the seismic waves away from the superstructure, by isolating the superstructure from the ground.This concept is widely essential to be implemented in structures(buildings) irrespective of many factors. There are several materials which could be implemented as base isolator, however the need in reduction of the number of the isolators is essential dueto various factors which a developing country finds difficult to implement. In this paper, a three-storey unsymmetrical building to be considered for the study is isolated by varying the mass of the foundation beam, (Transfer beam) thereby reducing the number of isolators in the building.Furthermore,the mode shapes and  frequencies of the structure without base isolation and with base isolation considering mass of the base isolation system as a key factor were analysed and compared and hence the variation in the mass of the isolation system has a promising effect in altering the higher modes of vibration. The analysis is prolonged using  another methd using UBC-1997 provisions and compared. In both the methods, the influence of the mass of the isolation system has a remarkable effect in altering the higher modes of vibration.

scholarly journals Seismic Isolation Performance Evaluation for a Class of Inerter-Based Low-Complexity Isolators

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Fei Cao ◽  
Michael Z. Q. Chen ◽  
Yinlong Hu
Keyword(s):  
Performance Optimization ◽  
Seismic Isolation ◽  
Base Isolation ◽  
Low Complexity ◽  
Mass Ratio ◽  
Mass Damper ◽  
H2 Performance ◽  
Seismic Base Isolation ◽  
Isolation Performance ◽  
Better Than

In this paper, the seismic base isolation problem for all low-complexity networks containing one inerter, one spring, and one damper is studied based on a multi-degree-of-freedom model. The analytical solutions for the H2 performance optimization are derived, and the traditional tuned mass damper (TMD) is employed for comparison. Extensive numerical simulations are performed to verify the effectiveness of the obtained results. The results show that for different seismic wave excitations, some isolators are better than TMD in controlling the displacement of the main structure. Moreover, with the increase of the TMD mass ratio, the isolation performances of the inerter-based isolators are increasingly better than that of TMD.

Exact Solution of the Base-Isolated Structure With Sliding Type Base Isolator

2004 ◽  
Author(s):  
C. S. Tsai ◽  
Tsu-Cheng Chiang ◽  
Bo-Jen Chen
Keyword(s):  
Exact Solution ◽  
Seismic Response ◽  
Earthquake Engineering ◽  
Degrees Of Freedom ◽  
Good Accuracy ◽  
Base Isolation ◽  
Time History ◽  
Relative Deformation ◽  
History Analysis ◽  
Base Isolator

The use of base isolation for enhancing the seismic resistibility has been proved as an efficiency way from experimental efforts and theoretical studies. It is usual to insert a flexible device in horizontal direction to permit the most relative deformation at this level. Because of the rigidity of the superstructure is much higher than that of the base isolator underneath the structure, therefore, the behavior of the superstructure can be idealized as a rigid body during earthquakes. In general, hundreds of degrees of freedom and a step-by-step time history analysis are the basic requisitions for calculating the seismic response of a base isolated structure under earthquakes. In order to develop a simple tool which can be easily adopted for calculating the sliding displacement and the shear force of the base isolator, an exact solution for predicting the seismic responses of base isolated structures has been derived in this study. The comparison between the experimental results conducted at National Center for Research on Earthquake Engineering (NCREE) in Taiwan and the analytical results obtained from the exact solution show that the exact formulation derived in this study can predict the seismic response of the base isolated structure with very good accuracy.

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