Inquiry Into Characteristic of Multiple Friction Pendulum System With Multiple Sliding Surfaces Under Bidirectional Loadings

2013 ◽  
Author(s):  
C. S. Tsai ◽  
Y. M. Wang ◽  
H. C. Su
Keyword(s):  
Earthquake Engineering ◽  
Steel Structure ◽  
Shaking Table ◽  
Isolation System ◽  
Pendulum System ◽  
Ground Shaking ◽  
Sliding Surfaces ◽  
Friction Pendulum ◽  
Stiffness And Damping ◽  
Friction Pendulum System

In order to investigate the bidirectional characteristic of a multiple friction pendulum system (MFPS) with multiple sliding surfaces, a series of component tests were performed by using the shaking table in the National Center for Research on Earthquake Engineering, Taipei, Taiwan. The multiple friction pendulum system with multiple sliding surfaces consists of double concave surfaces, more than one intermediate sliding plates and one articulated slider located between the concave surfaces and intermediate sliding plates. These devices can continuously change their horizontal stiffness, damping, and displacement capacities during ground shaking by virtue of the properties such as radii and friction coefficients of multiple sliding surfaces. In this study, both uni- and bidirectional component tests of a multiple friction pendulum system with three and four sliding surfaces were carried out to investigate its mechanical characteristic. Furthermore, results obtained from the shaking table tests of an isolated steel structure demonstrate that the MFPS isolation system with multiple sliding surfaces could properly change its stiffness and damping effect, and effectively reduce the excitation force during ground shaking.

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.

Applications of Multiple Trench Friction Pendulum System to Seismic Mitigation of Structures

2008 ◽  
Author(s):  
C. S. Tsai ◽  
Jeng-Wen Lin ◽  
Yung-Chang Lin ◽  
Chia-Chi Chen
Keyword(s):  
Base Isolation ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Natural Period ◽  
Isolation System ◽  
Pendulum System ◽  
Base Isolation System ◽  
Friction Pendulum ◽  
Seismic Mitigation ◽  
Friction Pendulum System

In order to promote seismic resistance capability of structures and simplify the manufacturing processes of an isolator, a new base isolation system called the multiple trench friction pendulum system (MTFPS) is proposed. The investigations for the proposed isolator have been carried out to address its mechanical characteristics and to assess its performance in seismic mitigation through a series of shaking table tests in this study. The MTFPS isolator can provide different natural periods, displacement capacities and damping effects in any two independent directions. The natural period and damping effect for a MTFPS isolator change continually during earthquakes. Results from the shaking table tests on a scaled three-story structure isolated with MTFPS isolators illustrate that the proposed MTFPS isolator can isolate most earthquake induced energy and provide good protection for structures from earthquake damage. In addition, the mathematical formulations for the MTFPS isolator have also been derived to examine its characteristics.

Finite Element Formulations and Experimental Study for Direction Optimized-Friction Pendulum System

2007 ◽  
Author(s):  
C. S. Tsai ◽  
T. C. Chiang ◽  
Wen-Shin Chen ◽  
Chen-Tsung Yang ◽  
Jian-Liang Lin
Keyword(s):  
Nonlinear Behavior ◽  
Steel Structure ◽  
Shaking Table ◽  
Pendulum System ◽  
Seismic Engineering ◽  
Fixed Base ◽  
Near Fault Earthquakes ◽  
Friction Pendulum ◽  
Base Structure ◽  
Friction Pendulum System

The Friction Pendulum System (FPS) invented by V. A. Zayas in 1987 has been widely used in the seismic engineering all over the world. The efficiency for upgrading the earthquake-proof capability of a fixed base structure has been proved either from theoretical studies or experimental efforts. However, the seismic responses of the FPS-isolated structure are always significant as subjected to near fault earthquakes and strong ground motions with long predominant periods. In order to overcome the drawback of the FPS, a new base isolator named as the Direction Optimized Friction Pendulum System (DO-FPS) has been proposed in this study. The proposed device is mainly composed of a spherical sliding surface, a trench concave surface and an articulated slider. By using the special design, the isolation period is a function of the angle between the directions of the resultant displacement. Therefore, the undesirable phenomenon of resonance could always be prevented. In order to verify the functionality of the proposed device, the shaking table tests of a three story steel structure with DOFPS base isolators have been performed. The test results reveal that the proposed device can effectively upgrade the seismic resistibility of a conventionally fixed base structure. Furthermore, the comparisons between the numerical and the experimental results show that the theory proposed in this study could predict the nonlinear behavior of the DO-FPS with good accuracy.

Shaking Table Tests of a Building Isolated With Trench Friction Pendulum System

2006 ◽  
Author(s):  
C. S. Tsai ◽  
Po-Ching Lu ◽  
Wen-Shin Chen
Keyword(s):  
Seismic Isolation ◽  
Steel Structure ◽  
Shaking Table ◽  
Engineering Practice ◽  
Shaking Table Tests ◽  
Pendulum System ◽  
Promising Tool ◽  
Friction Pendulum ◽  
Design And Manufacture ◽  
Friction Pendulum System

It has been proven that the seismic isolation technology is a very promising tool to lessen damage caused by earthquakes. In order to provide a cheap and efficient base isolator for engineering practice, a new isolator named the trench friction pendulum system (TFPS), which is easy to design and manufacture, is proposed in this study. A series of shaking table tests of a scaled steel structure equipped with TFPS isolators were performed in the Department of Civil Engineering, Feng Chia University, Taichung, Taiwan. Experimental results demonstrate that the TFPS isolator can isolate most of earthquake induced energy trying to impart into the superstructure and that the device is not only cheap but also efficient for seismic mitigation.

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.

Multiple Yield and Bounding Surfaces Model for Analysis of Multiple Friction Pendulum System

2009 ◽  
Author(s):  
C. S. Tsai ◽  
Yung-Chang Lin ◽  
H.-C. Su
Keyword(s):  
Mechanical Characteristic ◽  
Isolation System ◽  
Pendulum System ◽  
Damping Effect ◽  
Proposed Model ◽  
Sliding Interfaces ◽  
In Series ◽  
Friction Pendulum ◽  
Bounding Surfaces ◽  
Friction Pendulum System

In order to systematically investigate the mechanical characteristic of a multiple friction pendulum system with more than two concave sliding interfaces and one articulated slider located between these concave sliding interfaces, on the basis of the plasticity theory, a plasticity model called the multiple yield and bounding surfaces model is proposed in addition to analytical formulations derived from the proposed concept of subsystems in this study. The proposed model has two separate groups of multiple yield and bounding surfaces. The first group is adopted to describe the mechanical behavior of the subsystem including the concave sliding interfaces above the articulated slider and the second group is used for modeling the sliding characteristic of the subsystem representing the concave sliding interfaces below the articulated slider. The connection of these two subsystems in series forms the mechanical characteristic of the entire MFPS isolation system. By virtue of the proposed model, the phenomena of the sliding motions of the MFPS isolator with multiple concave sliding interfaces under cyclical loadings can be clearly understood. Analytical results infer that the natural frequency and damping effect of the MFPS isolator with multiple concave sliding interfaces change continually during earthquakes and are controllable through appropriate designs.

Theoretical study of the double concave friction pendulum system under variable vertical loading

2019 ◽  
Vol 22 (8) ◽  
pp. 1998-2005 ◽  
Author(s):  
Fangyuan Zhou ◽  
Weilin Xiang ◽  
Kun Ye ◽  
Hongping Zhu
Keyword(s):  
Theoretical Study ◽  
Earthquake Excitation ◽  
Friction Coefficients ◽  
Pendulum System ◽  
Vertical Loading ◽  
Sliding Surfaces ◽  
Vertical Ground ◽  
The Difference ◽  
Friction Pendulum ◽  
Friction Pendulum System

The double concave friction pendulum system has been recognized as an efficient device for decreasing the seismic response of a structure during an earthquake excitation. Previous studies have focused mainly on the properties of the double concave friction pendulum system under constant vertical loading, and the width of the hysteretic loop changed by the vertical ground motion is less considered. In view of this, a theoretical study of the double concave friction pendulum system under variable vertical loading is conducted in this article. Meanwhile, the properties of the hysteretic loops of the double concave friction pendulum system with different friction coefficients between the articulated slider with the upper and lower sliding surfaces are investigated. The results show that the hysteretic loops of the double concave friction pendulum system will be affected by the variation of the vertical loading and the difference of the friction coefficients between the articulated slider with the upper and lower sliding surfaces.

Seismic Responses of a Building Isolated With Multiple Friction Pendulum System Subjected to Multi-Directional Excitations

2010 ◽  
Author(s):  
C. S. Tsai ◽  
Yung-Chang Lin ◽  
H. C. Su
Keyword(s):  
Base Isolation ◽  
Numerical Analyses ◽  
Good Tool ◽  
Isolation System ◽  
Pendulum System ◽  
Sliding Interfaces ◽  
Base Isolation System ◽  
Structural Responses ◽  
Friction Pendulum ◽  
Friction Pendulum System

In order to prevent a building from earthquake damage, a base isolation system called the multiple friction pendulum system (MFPS) which has numerous concave sliding interfaces is proposed to isolate a building from its foundation. Mathematical formulations have been derived to simulate the characteristic of the MFPS isolation system subjected to multi-directional excitations. By virtue of the derived mathematical formulations, the phenomena of the sliding motions of the MFPS isolator with several concave sliding interfaces under multi-directional earthquakes can be clearly understood. Also, numerical analyses of a building isolated with the MFPS isolator with several sliding interfaces have been conducted in this study to evaluate the efficiency of the proposed system in seismic mitigation. It has been proved through numerical analyses that structural responses have been reduced significantly and that the proposed system is a good tool to insure the safety of structures during earthquakes.

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