Research about Rolling Friction Pendulum Seismic Isolation System on Ellipse Track

2012 ◽  
Vol 594-597 ◽  
pp. 1749-1752
Author(s):  
Jiang Pan ◽  
Nan Ge ◽  
Li Ting Yao
Keyword(s):  
Seismic Isolation ◽  
Lagrange Equation ◽  
Rolling Friction ◽  
Bottom Plate ◽  
Isolation System ◽  
Friction Forces ◽  
Pendulum System ◽  
Vibration Period ◽  
Building Model ◽  
Friction Pendulum

A theoretical analyzing approach about a class of seismic isolation system RFPS (Rolling Friction Pendulum System) is presented.. It starts from the Lagrange equation in multiply body dynamics. This system consists of a roller which is placed in the vicinity of two ellipse concave slides. Computation results for ellipse slide show that it has the three kinds of necessary functions required for an effective isolation system. The relatively long vibration period provides the necessary isolation capability, the gravity provides the reposition capability, and the friction couple, formed with the rolling friction forces at the contacting surface on the top and bottom plate respectively, provides the energy dissipation capability. The evaluation results for a practical building model shows that RFPS has a satisfactory seismic isolation effect.

Research about Efficiency for Double Slipping-Surfaced FPS Seismic Isolating System

2013 ◽  
Vol 353-356 ◽  
pp. 2114-2118
Author(s):  
Ya Xi Yan ◽  
Xing Guo Wang ◽  
Qi Liu ◽  
Nan Ge
Keyword(s):  
Governing Equation ◽  
Seismic Isolation ◽  
Lagrange Equation ◽  
Seismic Action ◽  
Isolation System ◽  
Pendulum System ◽  
Interstorey Drift ◽  
Friction Plate ◽  
Friction Pendulum ◽  
Plate System

Numerical analyzing approach about a novel seismic isolation system, DFPS (Double Slippingsurfaced Friction Plate System), is presented in this paper. It starts from Lagrange equation, its governing equation is similar to that of the FPS friction pendulum system with single slipping surface. Result shows that storey drift resulted from seismic action tend to be even along the height, and interstorey drift, storey velocity and acceleration are significantly decreased on buildings equipped with DFPS system. An optimistic combination of them could exhibit good seismic isolation efficiency. It could reach 70% for μ=0.05, r=3.5m.

Seismic Isolation Retrofit of an Office Building Using Friction Pendulum System

2014 ◽  
Vol 578-579 ◽  
pp. 1361-1365
Author(s):  
Lin Liu ◽  
Xuan Min Li ◽  
Wei Tian
Keyword(s):  
Seismic Isolation ◽  
Base Isolation ◽  
Time History ◽  
Nonlinear Behavior ◽  
Office Building ◽  
Nonlinear Time History Analysis ◽  
Isolation System ◽  
Pendulum System ◽  
Nonlinear Time History ◽  
Friction Pendulum

Friction Pendulum Systems have been used as base isolation systems for both new construction and retrofit around the world. This paper presented its implementation in an office building located in Shanghai. To evaluate its impact on seismic performance of the retrofitted structure, models are needed to capture the intricate nonlinear behavior of both structural components and isolator elements. Nonlinear time history analysis of the building for the original and retrofitted cases was conducted to assess the efficiency of the isolation system at the high earthquake level. The numerical results indicate that the retrofitted structure experiences significantly less damage and less deformation due to the shake isolation and energy dissipation through the isolators.

Research on Seismic Isolation Properties for DFPS System

2010 ◽  
Vol 163-167 ◽  
pp. 4342-4345
Author(s):  
Nan Ge ◽  
Hai Bin Chen ◽  
Xing Guo Wang
Keyword(s):  
Friction Coefficient ◽  
Seismic Isolation ◽  
Optimum Combination ◽  
Seismic Action ◽  
Isolation System ◽  
Pendulum System ◽  
Slipping Friction ◽  
Friction Plate ◽  
Friction Pendulum ◽  
Plate System

A theoretical analyzing approach about a novel seismic isolation system, DFPS (Double Slipping-Surfaced Friction Plate System), is presented in this paper. Its governing equation is similar to that of the FPS friction pendulum system with single slipping surface. It is shown that the inter-storey drift resulted from seismic action could be drastically decreased on buildings equipped with DFPS system. If an optimum combination of slide radius and slipping friction coefficient is adopted, the seismic isolation effectiveness could be as high as 90%.

A Simple Pendulum Technique for Achieving Seismic Isolation

1990 ◽  
Vol 6 (2) ◽  
pp. 317-333 ◽  
Author(s):  
Victor A. Zayas ◽  
Stanley S. Low ◽  
Stephen A. Mahin
Keyword(s):  
Seismic Isolation ◽  
Building Design ◽  
Seismic Resistance ◽  
Existing Buildings ◽  
Pendulum Motion ◽  
Isolation System ◽  
Pendulum System ◽  
Technical Performance ◽  
Environmental Deterioration ◽  
Friction Pendulum

An innovative seismic isolation system, the Friction Pendulum System (FPS), offers improvements in strength, versatility and ease of installation as compared to previous systems. Moreover, the approach offers several inherent performance benefits not available before. The FPS uses geometry and gravity to achieve the desired seismic isolation results. It is based on well known engineering principles of pendulum motion, and is constructed of materials with demonstrated longevity and resistance to environmental deterioration. The desirable isolation characteristics exhibited by FPS components hold the promise of an effective and practical system for significantly increasing the seismic resistance of new and existing buildings. This paper summarizes results of a comprehensive research and testing program to assess the technical performance of the FPS. In addition, an example building design using the FPS is given.

scholarly journals A comparative study of base isolation devices in light rail transit structure featured with lead rubber bearing and friction pendulum system

2018 ◽  
Vol 195 ◽  
pp. 02013
Author(s):  
Santi Nuraini ◽  
Asdam Tambusay ◽  
Priyo Suprobo
Keyword(s):  
Seismic Isolation ◽  
Time History ◽  
Light Rail ◽  
Rail Transit ◽  
Light Rail Transit ◽  
Pendulum System ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
Friction Pendulum ◽  
Friction Pendulum System

Advanced nonlinear analysis in light rail transit (LRT) structures has been undertaken to examine the influence of seismic isolation devices for reducing seismic demand. The study employed the use of two types of commercially available bearings, namely lead rubber bearing (LRB) and friction pendulum system (FPS). Six LRT structures, designed to be built in Surabaya, were modelled using computer-aided software SAP2000, where each of the three structures consisted of three types of LRB and FPS placed onto the pier cap to support the horizontal upper-structural member. Nonlinear static pushover and dynamic time history analysis with seven improved ground motion data was performed to gain improved insights on the behavioural response of LRT structures, allowing one to fully understand the supremacy of seismic isolations for protecting the structure against seismic actions. It is shown that both devices manage to isolate seismic forces, resulting in alleviation of excessive base shear occurring at the column. In addition, it is noticeable that the overall responses of LRB and FPS shows marginal discrepancies, suggesting both devices are interchangeable to be used for LRT-like structures.

scholarly journals The Roball

2002 ◽  
Vol 35 (3) ◽  
pp. 204-207 ◽  
Author(s):  
William H. Robinson
Keyword(s):  
Seismic Isolation ◽  
Inverted Pendulum ◽  
Experimental Results ◽  
Flat Plates ◽  
Isolation System ◽  
Friction Forces ◽  
New Device ◽  
System A ◽  
Full Scale Tests ◽  
User Friendly

Robinson Seismic's latest developments in seismic isolation includes a new device, the RoballTM, for seismically isolating structures during earthquakes. This advance is a new concept for seismic isolation based on the principle of the inverted pendulum. It consists of 'friction balls' or 'Roballs' moving between upper and lower spherical like cavities or flat plates. The Roballs are filled with a material which is able to provide the friction forces required to absorb the energy from numerous earthquakes while supporting the structure. The Roball technique is expected to enable light and in the future possibly heavy structures to be more economically seismically isolated. As part of a program to develop a user friendly 'seismic isolation system' a series of full-scale tests have been carried out on a number of possible designs including three approaches for vertical pressures of -1 MPa resulting in coefficients of friction of -0.1 to -0.4. In this paper we present the preliminary experimental results.

scholarly journals Comparative analysis of conventional and new seismically isolated structure

2021 ◽  
Vol 64 (3) ◽  
pp. 185-193
Author(s):  
Jelena Ristić ◽  
Miloš Vučinić ◽  
Danilo Ristić ◽  
Milutin Vučinić
Keyword(s):  
Seismic Isolation ◽  
Low Cost ◽  
Seismic Energy ◽  
Seismic Excitation ◽  
Isolation System ◽  
Vibration Period ◽  
International Projects ◽  
Dominant Period ◽  
Efficient Protection ◽  
Seismically Isolated

Extensive analytical and experimental research has been done by the authors directed to mitigation of the effects of earthquakes on structures. The research results mainly represent parts of the realized several related international projects. A selected part of the analytical studies directed to comparison between conventional and seismically isolated frame structures is presented in this paper. The responses of the applied newely developed advanced seismic isolation system HC-RMS-GOSEB to the simulated input excitation of three representative earthquakes of intensity 0.50g, have shown that it is very effective for construction of vibro-isolated and seismically resistant buildings, providing activated multistage seismic response and globally optimized seismic energy balance. Its application achieves an increase in the vibration period of the structure, far enough from the dominant period of seismic excitation. The results of the research confirm that this system is a potential solution for achieving low-cost and highly efficient protection of buildings.

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.

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.

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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