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

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.

Experimental Study of a Full Scale Building Isolated With Multiple Friction Pendulum System With Multiple Sliding Interfaces

2011 ◽  
Author(s):  
C. S. Tsai ◽  
Y. M. Wang ◽  
H. C. Su
Keyword(s):  
Full Scale ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Pendulum System ◽  
Residual Displacements ◽  
Fixed Base ◽  
Sliding Interfaces ◽  
Friction Pendulum ◽  
Base Structure ◽  
Friction Pendulum System

Presented in this paper is the performance evaluation of the multiple friction pendulum system (MFPS) with multiple sliding interfaces on seismic mitigation through a series of shaking table tests of a full scale MFPS-isolated building. In the tests, a three-story steel building of 40 tons in total weight, 3m and 4.5m in two horizontal directions and 9m in height, was equipped with MFPS isolators each with 4 sliding interfaces and subjected to various types of earthquakes to examine the efficiency of the isolators in reducing seismic response of a structure. Experimental results from shaking table tests tells that the roof accelerations, base shears, column shear forces have been significantly lessened with negligible residual displacements in the isolators while compared to the responses of a fixed-base structure.

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.

Experimental Investigation on Performance of Multiple Direction Optimized-Friction Pendulum System With Multiple Sliding Interfaces in Mitigating Structural Responses During Earthquakes

2011 ◽  
Author(s):  
C. S. Tsai ◽  
C. I. Hsueh ◽  
H. C. Su
Keyword(s):  
Experimental Tests ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Shear Forces ◽  
Pendulum System ◽  
Steel Building ◽  
Sliding Interfaces ◽  
Structural Responses ◽  
Friction Pendulum ◽  
Friction Pendulum System

This paper is aimed at the performance evaluation of the multiple direction-optimized friction pendulum system (MDO-FPS) with multiple sliding interfaces on seismic mitigation through a series of shaking table tests of a full scale building isolated with MDO-FPS isolators. Experimental tests of a three-story steel building of 40 tons in total weight, 3m and 4.5m in length and width, respectively, in two horizontal directions and 9m in height, subjected to various types of earthquakes were carried out to investigate the efficiency of the isolators in reducing structural responses during earthquakes. Results obtained from the shaking table tests demonstrate that the roof accelerations, base shears, column shear forces have been remarkably reduced while compared to the responses of a traditionally designed structure.

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.

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.

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