Application of Direction Optimized-Friction Pendulum System to Seismic Mitigation of Sensitive Equipment

2007 ◽  
Author(s):  
C. S. Tsai ◽  
Wen-Shin Chen ◽  
T. C. Chiang ◽  
Yung-Chang Lin
Keyword(s):  
Seismic Energy ◽  
Shaking Table ◽  
High Tech ◽  
Radius Of Curvature ◽  
Pendulum System ◽  
Displacement Capacity ◽  
Base Isolator ◽  
Earthquake Resistant ◽  
Control Devices ◽  
Friction Pendulum

In the recent years, earthquake proof devices have been used to promote the earthquake resistant capabilities of many structures and public constructions. In addition, the high-tech industries are an important key to economic development in some earthquake prone areas, and many historical relics are also located in these areas. Therefore, how to protect the critical equipments from earthquake damage is an important issue. Among many control devices, sliding type isolators such as the FPS, MFPS and TFPS, ect. Isolators are used to lengthen the natural periods of equipment, and to isolate the seismic energy trying to impart to structures. However, the frequency and displacement capacity have been predefined when the radius of curvature of the concave surface or stiffness of base isolator is once determined. In this study, the base isolator with variable frequencies and displacement capacities has been proposed, and several shaking table tests of critical sensitive equipment with the proposed isolators have been carried out in Feng Chia University. The experimental results illustrated that the most responses of tested equipment have been reduced during earthquake.

Seismic Behavior of High-Tech Facility Isolated With a Trench Friction Pendulum System

2006 ◽  
Author(s):  
C. S. Tsai ◽  
Yung-Chang Lin ◽  
Wen-Shin Chen
Keyword(s):  
High Efficiency ◽  
Base Isolation ◽  
Good Choice ◽  
Earthquake Damage ◽  
Shaking Table ◽  
High Tech ◽  
Isolation System ◽  
Pendulum System ◽  
Friction Pendulum ◽  
Friction Pendulum System

Seismic mitigation of high-tech facilities is a very important issue in earthquake prone areas such as Taiwan, Japan, U.S.A., etc. In order to lessen vulnerability of earthquake damage of high-tech equipment, base isolation seems to be a good choice. This paper mainly explores the possibility of using a new base isolation system named the trench friction pendulum system (TFPS) to reduce seismic responses of high-tech facilities. The main reasons, from a engineer’s point of view, to use this system for protecting high-tech equipment from earthquake damage are high efficiency and low cost. A series of shaking table tests for a high-tech facility isolated with TFPS isolators were carried out in the Department of Civil Engineering, Feng Chia University, Taichung, Taiwan, ROC. The experimental results show that the proposed system provides a good protection for the high-tech facility during strong earthquakes.

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.

Mechanical Modeling of Multiple Trench Friction Pendulum System With Multi-Intermediate Sliding Plates

2009 ◽  
Author(s):  
C. S. Tsai ◽  
Yung-Chang Lin ◽  
Wei-Chan Tsai
Keyword(s):  
Natural Frequency ◽  
Shaking Table ◽  
Mechanical Modeling ◽  
Shaking Table Tests ◽  
Pendulum System ◽  
Strong Earthquakes ◽  
Damping Effect ◽  
Base Isolator ◽  
Friction Pendulum ◽  
Friction Pendulum System

In order to upgrade the seismic resistibility of structures and enhance the functionality of an isolator, a new sliding type base isolator system called the multiple trench friction pendulum system (MTFPS) with multi-intermediate sliding plates is proposed. The MTFPS isolator is composed of a trench concave surface and numbers of intermediate sliding plates in each of two orthogonal directions. Mathematical formulations have been derived to examine its characteristics of the proposed MTFPS isolator. Based on mathematical formulations, it can be inferred that the natural frequency and damping effect of the MTFPS isolator change continually during earthquakes. Furthermore, results from shaking table tests demonstrate that the proposed isolator provides good protection to structures for preventing damage from strong earthquakes.

Component and shaking table tests for full-scale multiple friction pendulum system

2006 ◽  
Vol 35 (13) ◽  
pp. 1653-1675 ◽  
Author(s):  
C. S. Tsai ◽  
Wen-Shin Chen ◽  
Tsu-Cheng Chiang ◽  
Bo-Jen Chen
Keyword(s):  
Full Scale ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Pendulum System ◽  
Friction Pendulum ◽  
Friction Pendulum System

Finite element formulation and shaking table tests of direction-optimized-friction-pendulum system

2008 ◽  
Vol 30 (9) ◽  
pp. 2321-2329 ◽  
Author(s):  
C.S. Tsai ◽  
Po-Ching Lu ◽  
Wen-Shin Chen ◽  
Tsu-Cheng Chiang ◽  
Chen-Tsung Yang ◽  
...  
Keyword(s):  
Finite Element ◽  
Shaking Table ◽  
Finite Element Formulation ◽  
Element Formulation ◽  
Shaking Table Tests ◽  
Pendulum System ◽  
Friction Pendulum ◽  
Friction Pendulum System

Seismic Mitigation Assessment of Building Using Multiple Direction Optimized-Friction Pendulum System

2008 ◽  
Author(s):  
C. S. Tsai ◽  
Wen-Shin Chen ◽  
Yung-Chang Lin ◽  
Chi-Lu Lin
Keyword(s):  
Finite Element ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Finite Element Formulation ◽  
Element Formulation ◽  
Natural Period ◽  
Pendulum System ◽  
Friction Pendulum ◽  
Seismic Mitigation ◽  
Friction Pendulum System

In order to prevent a building near a fault from earthquake damage, in this study an advanced base isolation system called the multiple direction optimized-friction pendulum system (Multiple DO-FPS or MDO-FPS) is proposed and examined to address its mechanical behavior through the finite element formulation and evaluate its efficiency in seismic mitigation through a series of shaking table tests. On the basis of the finite element formulation, it is revealed that the natural period, the capacity of the bearing displacement and damping effect for the Multiple Direction Optimized-Friction Pendulum System (Multiple DO-FPS) change continually during earthquakes. Therefore, the MDO-FPS isolator can avoid possibility of resonance of enriched frequencies from ground motions and provide an efficient capacity of the bearing displacement and damping during the earthquakes. Simultaneously, the shaking table test results also illustrate that the Multiple DO-FPS isolator possesses an outstanding seismic mitigation capabilities.

Shaking Table Tests of Static Dynamics Interchangeable-Ball Pendulum System for Motion Sensitive Equipment

2008 ◽  
Author(s):  
C. S. Tsai ◽  
Wen-Shin Chen ◽  
Ching-Pei Tsou ◽  
Chen-Tsung Yang
Keyword(s):  
Stress Concentration ◽  
Economic Loss ◽  
Shaking Table ◽  
High Tech ◽  
Sliding Surface ◽  
Shaking Table Tests ◽  
High Tech Industry ◽  
Pendulum System ◽  
Industrial Buildings ◽  
Key Industry

Recently, the high-tech industry has become a key industry for economic development in many countries. However, motion sensitive equipments located in these industrial buildings are vulnerable during earthquakes, which may cause huge economic loss. In this study, an isolator for safeguarding the motion sensitive equipment, namely, the static dynamics interchangeable–ball pendulum system (SDI-BPS) is proposed and investigated to examine its protective capability for the motion sensitive equipment during earthquakes through a series of shaking table tests. The experimental results illustrate that the SDI-BPS isolator can provide significant damping to reduce the large bearing displacement and size, and avoid the stress concentration, which can cause damage or scratches on the sliding surface of the isolator, to prolong its life span of service. The SDI-BPS isolator also provides excellent capability in protecting the motion sensitive equipment and exhibits a stable behavior under long terms of service loadings and earthquakes.

Characteristics and Modeling of Multiple Direction Optimized-Friction Pendulum System With Numerous Sliding Interfaces Subjected to Multidirectional Excitations

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
C. S. Tsai ◽  
H. C. Su ◽  
Yung-Chang Lin
Keyword(s):  
Simple Manner ◽  
Natural Period ◽  
Pendulum System ◽  
Damping Effect ◽  
Proposed Model ◽  
Base Isolator ◽  
Sliding Interfaces ◽  
Friction Pendulum ◽  
Bounding Surfaces ◽  
Friction Pendulum System

In this paper, a base isolator called a multiple direction optimized-friction pendulum system (Multiple DO-FPS) with numerous sliding interfaces is proposed. To understand the mechanical behavior of the Multiple DO-FPS isolator under multidirectional excitations, an analytical model called the multiple yield and bounding surfaces model is proposed. On the basis of the derived mathematical formulations for simulation of the characteristics of the Multiple DO-FPS isolation bearing, it is revealed that the natural period and damping effect of the Multiple DO-FPS isolator are a function of the sliding displacement and sliding direction. By virtue of the proposed model, the phenomena of the sliding motions of the Multiple DO-FPS isolator with numerous sliding interfaces subjected to multidirectional excitations can be understood in a simple manner. The analytical results indicate that the natural frequency and damping effect of the Multiple DO-FPS isolator with numerous concave sliding interfaces change continually during earthquakes and are controllable through appropriate designs.

Characteristic and Modeling of Multiple Direction Optimized-Friction Pendulum System With Numerous Sliding Interfaces Subjected to Multi-Directional Excitations

2010 ◽  
Author(s):  
C. S. Tsai ◽  
Yung-Chang Lin ◽  
H.-C. Su
Keyword(s):  
Natural Period ◽  
Pendulum System ◽  
Damping Effect ◽  
Sliding Direction ◽  
Proposed Model ◽  
Base Isolator ◽  
Sliding Interfaces ◽  
Friction Pendulum ◽  
Bounding Surfaces ◽  
Friction Pendulum System

In this paper, a base isolator call the multiple direction optimized-friction pendulum system (Multiple DO-FPS) with numerous sliding interfaces is proposed. For understanding the mechanical behavior of the Multiple DO-PFS isolator under multi-directional excitations, an analytical model called the multiple yield and bounding surfaces model is also proposed. On the basis of the derived mathematical formulations for the simulation of the characteristic of the Multiple DO-FPS isolation bearing, it is revealed that the natural period and damping effect for a Multiple DO-FPS is a function of the sliding displacement and sliding direction. By virtue of the proposed model, the phenomena of the sliding motions of the Multiple DO-FPS isolator with numerous sliding interfaces subjected to multi-directional excitations can be simply understood. Analytical results infer that the natural frequency and damping effect of the Multiple DO-PFS isolator with numerous concave sliding interfaces change continually during earthquakes and are controllable through appropriate designs.

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