RADAS Device Technology for Retrofitting Damaged Structures in 921 Chi-Chi Earthquake

2002 ◽  
Author(s):  
C. S. Tsai ◽  
C. S. Chen ◽  
B. J. Chen ◽  
W. S. Pong
Keyword(s):  
Structural Control ◽  
Shaking Table ◽  
Severe Damage ◽  
Seismic Hazard Mitigation ◽  
Richter Scale ◽  
Earthquake Resistant ◽  
New Type ◽  
Control Technologies ◽  
Energy Absorbing ◽  
Device Technology

The 921 Chi-Chi earthquake was the most destructive earthquake for Taiwan in the twentieth century. The earthquake caused severe damage or collapse to residential and public structures. In addition to the use of traditional earthquake-resistant technologies for retrofitting damaged structures, new structural control technologies have been also adopted. The RADAS (Reinforced Added Damping and Stiffness) device is a new type of earthquake-proof technology. The RADAS device has been proved as a very reliable energy-absorbing device for seismic hazard mitigation through shaking table tests. In this paper, we will present the application of RADAS devices to damaged structures in the 921 Chi-Chi earthquake. It is also illustrated in this study that new structures equipped with RADAS Devices can enhance seismic resistibility, even if earthquakes exceed ML 7.3 magnitude on the Richter scale. Therefore, it is a sensible choice to use RADAS devices to retrofit damaged structures and to enhance the earthquake-resistant capacity of new structures.

Experimental Study of MFPS-Isolated Sensitive Equipment

2005 ◽  
Author(s):  
C. S. Tsai ◽  
C. K. Cheng ◽  
M. J. Chen ◽  
S. H. Yu
Keyword(s):  
Structural Damage ◽  
Structural Control ◽  
High Technology ◽  
Shaking Table ◽  
Input Energy ◽  
Shaking Table Tests ◽  
Pendulum System ◽  
Earthquake Resistant ◽  
The Rich ◽  
Friction Pendulum

After observations of many seismic disasters, let is found that many structures were just damaged slightly or even without any damage such as hospitals, high technology factories, computer generator rooms, but huge damage to internal installations was caused by earthquakes. Therefore, in addition to promoting the earthquake-resistant capacity of a structure, it is also important to ensure the safety of ancient objects and instruments in the structure. Structural control has been recognized as an effective and attractive method for preventing structural damage from earthquakes. In this study, shaking table tests of the high-end server equipment equipped with the multiple friction pendulum system (MFPS) were carried out to study the earthquake-proof benefit of the MFPS isolator. The MFPS isolator can not only shift the natural periods of high-end server equipments away from the rich period contents of earthquake motions, but also provide considerable hysteretic friction damping to absorb the input energy of earthquakes to insure the sensitive equipments unharmed during earthquakes.

Experimental Study for a New Energy Dissipation Device: Multiple-Direction Damper

2002 ◽  
Author(s):  
C. S. Tsai ◽  
L. L. Chung ◽  
T. C. Chiang ◽  
B. J. Chen ◽  
W. S. Chen
Keyword(s):  
Energy Dissipation ◽  
Passive Control ◽  
Steel Structure ◽  
Experimental Results ◽  
Shaking Table ◽  
New Energy ◽  
Seismic Loadings ◽  
Control Technologies ◽  
Energy Dissipation Devices ◽  
Energy Absorbing

The way of passive control technologies has been recognized as an excellent method to mitigate seismic responses of structures during seismic excitations. In general, the energy dissipation devices based on their own mechanical property can be divided into two categories, which are velocity-dependent and displacement-dependent devices. In this study, a new displacement-dependent device which is called multiple-direction damper is proposed. The proposed damper has numerous advantages: (1) the fabrication of this energy-absorbing device is effortless; (2) the construction of the energy-absorbing system is easy; (3) it is simple to install the device into a structure; (4) the material used for this damper is easy to obtain; and (5) if any damage occurs in this damper during strong excitations, this energy-absorbing device can be replaced easily to recover its energy dissipation capacity. Experimental results from component tests show that the proposed damper provides significant energy-absorbing capacity. Furthermore, the multiple-direction dampers have also been equipped into a 5-story steel structure to demonstrate its efficiency on seismic mitigation. The experimental results from shaking table tests indicate that most of earthquake-induced energy imparted into the structure is dissipated by the proposed dampers. In the meanwhile, the seismic loadings imposing on the structure with devices can be reduced effectively as compared with those of the bare structure. Therefore, the multiple-direction damper can be recognized as an effective tool to assure the safety of structure under strong ground motions.

Shaking Table Test Analysis of Bottom-Business Multi-Story Masonry Structure in Small and Middle Towns in the Southward

2014 ◽  
Vol 580-583 ◽  
pp. 1463-1466
Author(s):  
Yong Duo Liang ◽  
Xun Guo ◽  
Hua Wei Yi ◽  
Yong Zhen Li ◽  
Jin Zheng Jiang
Keyword(s):  
Shaking Table Test ◽  
Masonry Structure ◽  
Shaking Table ◽  
Earthquake Simulation ◽  
Seismic Capacity ◽  
Test Analysis ◽  
Earthquake Resistant ◽  
Scale Models ◽  
Longitudinal Wall ◽  
Reduced Scale

Bottom-business multi-story masonry structure is widely used in small and middle towns in the southward in China. In the downtown of Beichuan county which affected by Wenchuan earthquake, more than 80% of this kind of building collapsed. But the Apartment of Beichuan Telecommunication Bureau behaved well earthquake resistant capacity with a moderate damage in the earthquake. The obvious difference between this building and others is the setting of winged columns in the front longitudinal wall of the first floor. For proving the influence of these members in the structure seismic capacity, the earthquake simulation shaking table test of 2 1/5 reduced scale models were designed and carried out. The models dynamic response, acceleration, displacement and strain were measured and collected, that model with winged columns behave well was testified. And the reinforcement method of balancing stiffness and increasing ductility is put forward. The results provide a foundation for the retrofitting design of the existing houses.

Geotechnical Seismic Isolation System - Experimental Study

2010 ◽  
Vol 163-167 ◽  
pp. 4449-4453
Author(s):  
Wei Xiong ◽  
Hing Ho Tsang ◽  
S.H. Lo ◽  
Shou Ping Shang ◽  
Hai Dong Wang ◽  
...  
Keyword(s):  
Seismic Isolation ◽  
Dynamic Performance ◽  
Testing Procedure ◽  
Shaking Table ◽  
Isolation System ◽  
Isolation Technique ◽  
Sand Mixture ◽  
Seismic Hazard Mitigation ◽  
Constituent Material ◽  
Different Levels

In this study, an experimental investigation program on a newly proposed seismic isolation technique, namely “Geotechnical Seismic Isolation (GSI) system”, is conducted with an aim of simulating its dynamic performance during earthquakes. The testing procedure is three-fold: (1) A series of cyclic simple shear tests is conducted on the key constituent material of the proposed GSI system, i.e., rubber-sand mixture (RSM) in order to understand its behavior under cyclic loadings. (2) The GSI system is then subjected to a series of shaking table tests with different levels of input ground shakings. (3) By varying the controlling parameters such as percentage of rubber in RSM, thickness of RSM layer, coupled with the weight of superstructure, a comprehensive parametric study is performed. This experimental survey demonstrates the excellent performance of the GSI system for potential seismic hazard mitigation.

scholarly journals Community Based Tourism Tantangan Dusun Nglepen dalam Pengembangan Desa Wisata

2018 ◽  
Vol 5 (1) ◽  
pp. 42-55
Author(s):  
Dhimas Setyo Nugroho
Keyword(s):  
Community Participation ◽  
Positive Impact ◽  
Severe Damage ◽  
Community Based ◽  
Village Community ◽  
Earthquake Resistant ◽  
In The Beginning ◽  
The Impact ◽  
The Village ◽  
Tourism Community

ABSTRAK Masyarakat Dusun Nglepen pada awalnya adalah masyarakat pedesaan yang mayoritas menggantungkan mata pencaharian sebagai petani. Setelah bencana gempa bumi 5,9 skala richter yang menimbulkan kerusakan parah pada Sabtu 27 Mei 2006, Dusun Nglepen direlokasi ke wilayah lain, dibangun dengan bangunan rumah tahan gempa berbentuk kubah (dome). Keunikan desain rumah dome justru menjadi daya tarik desa wisata yang sangat diminati. Disisi lain, peralihan sosio-kultural masyarakat Dusun Nglepen menjadi masyarakat pariwisata sangat menarik untuk diamati. Artikel ini menyajikan gambaran tantangan dalam pengembangan Community Based Tourism Dusun Nglepen yang dikaji berdasarkan teori partisipasi masyarakat melalui analisis deskriptif kualitatif. Hasil menunjukan bahwa semakin tinggi partisipasi warga, maka semakin tinggi dampaknya tehadap masyarakat. Dampak yang ditemukan cenderung bernilai positif bagi masyarkat baik secara ekonomi maupun sosial budaya. Selanjutnya dampak positif yang dirasakan masyarakat cenderung mempengaruhi tingkat partisipasi dalam pengembangan pariwisata. Kata kunci : Community-Based Tourism, Desa Wisata, Partisipasi Masyarakat ABSTRACT In the beginning, the community of the village dwellers that worked as a farmer. After the disastrous earthquake of a 5.9 magnitude earthquake that caused severe damage on Saturday, May 27, 2006, the village relocated to other areas, houses constructed with earthquake resistant with the shape of a dome (dome). The uniqueness of the design of the House, thus becoming an attraction. On the other hand, the transition of social-cultural into tourism community is very interesting to observe. This article presents an overview of the challenges in the development of community-based tourism, based on the theory of community participation through a descriptive qualitative analysis. The results showed that the higher the participation of citizens, then the higher the impact on the community. The impact positive for society, both economically, socially and culturally. In addition, the positive impact affected the level of community participation in tourism development. Key words : Community-Based Tourism, Tourism Village, Community Participation

Shaking Table Tests of Full Scale Base-Isolated Structures

2002 ◽  
Author(s):  
C. S. Tsai ◽  
B. J. Chen ◽  
T. C. Chiang
Keyword(s):  
Structural Control ◽  
Control Strategies ◽  
Steel Structure ◽  
Seismic Energy ◽  
Full Scale ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Natural Period ◽  
Rubber Bearing ◽  
Rubber Bearings

Conventional earthquake resistant designs depend on strengthen and ductility of the structural components to resist induced forces and to dissipate seismic energy. However, this can produce permanent damage to the joints as well as the larger interstory displacements. In recently years, many studies on structural control strategies and devices have been developed and applied in U. S. A., Europe, Japan, and New Zealand. The rubber bearing belongs to one kind of the earthquake-proof ideas of structural control technologies. The installation of rubber bearings can lengthen the natural period of a building and simultaneously reduce the earthquake-induced energy trying to impart to the building. They can reduce the magnitude of the earthquake-induced forces and consequently reduce damage to the structures and its contents, and reduce danger to its occupants. This paper is aimed at studying the mechanical behavior of the stirrup rubber bearings (SRB) and evaluating the feasibility of the buildings equipped with the stirrup rubber bearings. Furthermore, uniaxial, biaxial, and triaxial shaking table tests are conducted to study the seismic response of a full-scale three-story isolated steel structure. Experimental results indicate that the stirrup rubber bearings possess higher damping ratios at higher strains, and that the stirrup rubber bearings provide good protection for structures. It has been proved through the full-scale tests on shaking table that the stirrup rubber bearing is a very promising tool to enhance the seismic resistibility of structures.

Shaking Table Tests of Critical Equipment With Simple Isolators

2006 ◽  
Author(s):  
C. S. Tsai ◽  
Wen-Shin Chen ◽  
Shih-Hsien Yu ◽  
Chen-Tsung Yang
Keyword(s):  
Shaking Table ◽  
Original Position ◽  
Economic Losses ◽  
High Tech ◽  
Shaking Table Tests ◽  
Restoring Force ◽  
Ground Acceleration ◽  
Maximum Displacement ◽  
Natural Period ◽  
Energy Absorbing

Because the earthquake is one kind of non-predictable calamity and happens suddenly, its disaster and consequence are larger than other calamities. Mankind must face not only the emotional effects caused by earthquakes, but also the damage to the structure and substructure systems. The fire, damaged pipeline systems cased by earthquake and the destruction of the semiconductor, equipment or microelectronics in high-tech factories will cause an enormous and a chain of economic losses. Therefore, there is a need of an economical and efficient method to protect equipments from earthquake damage. Namely, in addition to promoting the earthquake-resistant capacity of structures, it is also important to ensure the safety of the expensive equipment and facilities. In this study, it is aimed at developing a new simple isolator with appropriate damping for critical equipment. The basic principle of the simple isolator is to lengthen the natural period of equipment, and simultaneously to reduce the earthquake-induced energy and the displacement of the isolator by additional damping. A series of shaking table tests for critical equipment isolated with simple isolators were carried out in the Department of Civil Engineering, Feng Chia University, Taichung, Taiwan. From these test results, it is illustrated that the simple isolator can reduce more than 80% responses of accelerations under earthquakes with peak ground acceleration of above 0.450g. Therefore, the simple isolator can be recognized as a feasible and promising way in mitigating the seismic responses of equipment. In addition, the simple isolator possesses enough energy absorbing capacity to reduce its maximum displacement and the restoring force to bring the isolator back to the original position without significant residual displacement.

scholarly journals Static Pull Testing of a New Type of Large Deformation Cable with Constant Resistance

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Zhigang Tao ◽  
Shihui Pang ◽  
Yijun Zhou ◽  
Haijiang Zhang ◽  
Yanyan Peng
Keyword(s):  
Large Deformation ◽  
Static Friction ◽  
Deformation Energy ◽  
Resistance Force ◽  
Constant Resistance ◽  
New Type ◽  
Field Static ◽  
Energy Absorbing ◽  
Pull Tests ◽  
Pull Testing

A new type of energy-absorbing cable, Constant-Resistance Large Deformation cable (CRLD cable) with three different specifications, has been recently developed and tested. An effective cable should occupy the ability of absorbing deformation energy from these geodisaster loads and additionally must be able to yield with the sliding mass movements and plastic deformation over large distances at high displacement rates. The new cable mainly consists of constant-resistance casing tube and frictional cone unit that transfers the load from the slope. When experiencing a static or dynamic load and especially the load exceeding the constant resistance force (CR-F, a static friction force derived from the movement of frictional cone unit in casing tube) of CRLD cable, the frictional cone unit will move in the casing tube along the axis and absorb deformation energy, accordingly. In order to assess the performance of three different specified cables in situ, a series of field static pull tests have been performed. The results showed that the first type of CRLD cable can yield 2000 mm displacement while acting 850 kN static pull load, which is superior to that of other two types, analyzing based on the length of the displacement and the level of static pull load.

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