INFLUENCE OF CYCLIC SHEAR DEFORMATION ON AE CHARACTERISTICS OF LAMINATED RUBBER BEARING

2018 ◽  
Vol 74 (4) ◽  
pp. I_481-I_489 ◽  
Author(s):  
Akihiro TANAKA ◽  
Yuma KAWASAKI ◽  
Kensuke UEDA ◽  
Kazuyuki IZUNO
Keyword(s):  
Shear Deformation ◽  
Cyclic Shear ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing

scholarly journals Development of Small-Sized Lead Inserted Laminated Rubber Bearing for Nuclear Component Seismic Isolation

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3193
Author(s):  
Gyeong-Hoi Koo ◽  
Jin-Young Jung ◽  
Jin-Hyeong Lee ◽  
Tae-Myung Shin ◽  
Jin-Young Park
Keyword(s):  
Shear Deformation ◽  
Seismic Isolation ◽  
Damping Ratio ◽  
Test Results ◽  
Performance Parameters ◽  
Shape Factors ◽  
Design Specifications ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Nuclear Component

This paper presents a design specification of the small-sized lead inserted laminated rubber bearing (LRB) for application to nuclear component seismic isolation and describes the results of test verification on design performance parameters such as effective horizontal stiffness, equivalent viscous damping ratio, design seismic isolation frequency, and ultimate shear deformation. To do this, two types of LRB, having the same vertical design load of 10 kN but with different shape factors, are designed, fabricated, and tested by the quasi-static procedures. To determine the effective horizontal stiffness and the equivalent damping value from the test results, the new method is proposed and compared with the methods of the ASCE and ISO standards in case that the tangential stiffness curve is not linear in tests. From the comparison between tests and design specifications in the performance parameters, it was found that the design specifications developed in this paper are in a good agreement with the test results. Furthermore, the target design shear deformation limits are confirmed to have sufficient design margins in ultimate shear deformation tests.

Shear deformation detection in smart rubber bearing (SRB) using active sensing method

2021 ◽  
Vol 242 ◽  
pp. 112573
Author(s):  
Yi Zeng ◽  
Peng Pan ◽  
Yingri Cao ◽  
Zhizhou He
Keyword(s):  
Shear Deformation ◽  
Active Sensing ◽  
Rubber Bearing

Compressive Strength of Laminated Rubber Bearing Due to Different Temperature Exposure

InCIEC 2013 ◽  
2014 ◽  
pp. 701-711
Author(s):  
Norliyati Mohd Amin ◽  
Anizahyati Alisibramulisi ◽  
Norhayati Kadir
Keyword(s):  
Compressive Strength ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Temperature Exposure

scholarly journals 3D-Finite element modeling of lead rubber bearing using high damping material

2019 ◽  
Vol 276 ◽  
pp. 01013
Author(s):  
Ahmad Basshofi Habieb ◽  
Tavio Tavio ◽  
Gabriele Milani ◽  
Usman Wijaya
Keyword(s):  
Finite Element ◽  
Shear Behaviour ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Fe Model ◽  
Rubber Material ◽  
Isolation System ◽  
Cyclic Shear ◽  
Rubber Bearing ◽  
Lead Rubber Bearing

Lead Rubber Bearing (LRB) has been widely applied for seismic protection of mid and high-rise buildings around the world. Its excellent energy dissipation becomes the most important aspect of this isolation system thanks to the plasticity and recovery behavior of the lead core. Aiming to develop a deeper knowledge on the behavior of LRB’s, a 3D detailed finite element (FE) modeling is performed in Abaqus FE software. Some important parameters involved in the model are plasticity of the lead core and hyper-elasticity and viscosity of the rubber material. The parameters for rubber material are derived from the results of experimental works in the laboratory, including uniaxial tensile test and relaxation test. The bearing model is then subjected to a cyclic shear-test under constant vertical load. The result of the 3D-FE model is then compared with the analytic-Abaqus model for LRB isolators, developed in the literature. Finally, both 3D-FE model and analytic model result in a good agreement on the shear behaviour of the presented LRB.

Analysis of Vibration Isolator’s Anti-Seismic Performance in Porcelain SF6 High Voltage Circuit Breaker

2013 ◽  
Vol 448-453 ◽  
pp. 2045-2048
Author(s):  
Yan Zhong Ju ◽  
Xin Lei Wu
Keyword(s):  
Seismic Performance ◽  
High Voltage ◽  
Seismic Isolation ◽  
Circuit Breaker ◽  
Isolation System ◽  
High Voltage Circuit Breaker ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Sf6 Circuit Breaker ◽  
Isolation Device

Choosing LW15-550Y porcelain high voltage SF6 circuit breaker as the research subject, we designed the lead laminated rubber bearing (LRB) seismic isolation device for LW15-550Y circuit breaker. We finally gets the results that the LRB isolation system increases the flexibility of the breaker structure and improves the seismic performance of the high voltage circuit breaker structure.

Rheological Behavior of Semisolid Al-6.5wt%Si Alloy under Cyclic Shear Deformation

2011 ◽  
Vol 306-307 ◽  
pp. 104-107
Author(s):  
Hong Chao Luo ◽  
Jun Mei Yang ◽  
Li Yuan Sun ◽  
Li Ping Ju
Keyword(s):  
Experimental Data ◽  
Shear Rate ◽  
Hysteresis Loop ◽  
Shear Deformation ◽  
Rheological Behavior ◽  
Qualitative Agreement ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Cyclic Shear ◽  
The Difference

In the present work, the MCF model for semisolid metal slurries (SSMS) is applied to investigate the thixotropy of the Al-6.5wt%Si alloy under cyclic shear deformation. The study shows that the semisolid Al-6.5wt%Si alloy has the behavior of thixotropy. The area of the hysteresis loop increases with decreasing the up-time, the initial shear rate and increasing resting time, solid volume fraction and maximum shear rate, respectively. These results have qualitative agreement with the experimental data. The origin of the hysteresis loop is atrributed to the difference between the deagglomeration rate and the agglomeration rate.

Soil - Structure Interaction Effects on the Bridge Isolation System

2011 ◽  
Vol 374-377 ◽  
pp. 2375-2378
Author(s):  
Hai Qing Liu ◽  
Ya Bing Wang
Keyword(s):  
Comparative Analysis ◽  
Soil Structure ◽  
Soil Structure Interaction ◽  
Structural System ◽  
Isolation System ◽  
Structure Interaction ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Set Up ◽  
D Model

Isolation technology has been applied to bridges more than before, and soil-structure interaction on structural system is gradually attracted people's attention, but combine the two is also considered very few especially in the bridge. In this paper, we combine the two cases, and set up 3-D model by ANSYS, do comparative analysis in three cases. The first is no bearing and no soil-structure interaction, the second is with laminated rubber bearing but not considering the soil - structure interaction, and the last one is considering both laminated rubber bearing and soil - structure interaction. Ultimately it proves that soil - structure interaction on the structure does produce effects what can not be ignored.

scholarly journals Effects of Shape Memory Alloys on Response of Steel Structural Buildings within Near Field Earthquakes Zone

2020 ◽  
Vol 6 (7) ◽  
pp. 1314-1327
Author(s):  
Mahmoud Ahmadinejad ◽  
Alireza Jafarisirizi ◽  
Reza Rahgozar
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Base Isolation ◽  
Near Field ◽  
Seismic Zone ◽  
Isolation System ◽  
Residual Displacements ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Isolation Systems

Base isolation is one of the effective ways for controlling civil engineering structures in seismic zone which can reduce seismic demand. Also is an efficient passive control mechanism that protects its superstructure during an earthquake. However, residual displacement of base-isolation systems, resulting from strong ground motions, remain as the main obstacle in such system’s serviceability after the earthquake. Shape Memory Alloys (SMA) is amongst the newly introduced smart materials that can undergo large nonlinear deformations with considerable dissipation of energy without having any permanent displacement afterward. This property of SMA may be utilized for designing of base isolation system to increase the structure’s serviceability. Here, a proposed semi-active isolation system combines laminated rubber bearing system with shape memory alloy, to take advantage of SMAs high elastic strain range, in order to reduce residual displacements of the laminated rubber bearing. Merits of the system are demonstrated by comparing it to common laminated rubber bearing isolation systems. It is found that the optimal application of SMAs in base-isolation systems can significantly reduce bearings’ residual displacements. In this study, OpenSees program for a three dimensional six-storey steel frame building has been used by locating the isolators under the columns for investigating the feasibility of smart base isolation systems, i.e., the combination of traditional Laminated Rubber Bearing (LRB) with the SMA, in reducing the structure’s isolated-base response to near field earthquake records are examined. Also, a new configuration of SMAs in conjunction with LRB is considered which make the system easier to operate and maintain.

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