Development of Laminated Rubber Bearings and their Implementation in Armenia

2009 ◽  
Author(s):  
M. Melkumyan
Keyword(s):  
Rubber Bearings

SEISMIC CAPACITY OF MEDIUM SIZE CONTINUOUS BRIDGES WITH LEAD-RUBBER BEARINGS

2019 ◽  
Vol 3 (Special Issue on First SACEE'19) ◽  
pp. 199-206
Author(s):  
Bertha Olmos ◽  
José Jara ◽  
José Luis Fabián
Keyword(s):  
Seismic Performance ◽  
Seismic Vulnerability ◽  
Base Isolation ◽  
Elastic Behaviour ◽  
Medium Size ◽  
Nonlinear Behaviour ◽  
Seismic Capacity ◽  
Damage Scenarios ◽  
Isolation Systems ◽  
Rubber Bearings

This paper investigates the effects of the nonlinear behaviour of isolation pads on the seismic capacity of bridges to identify the parameters of base isolation systems that can be used to improve seismic performance of bridges. A parametric study was conducted by designing a set of bridges for three different soil types and varying the number of spans, span lengths, and pier heights. The seismic responses (acceleration, displacement and pier seismic forces) were evaluated for two structural models. The first model corresponded to the bridges supported on elastomeric bearings with linear elastic behaviour and the second model simulated a base isolated bridge that accounts for the nonlinear behaviour of the system. The seismic demand was represented with a group of twelve real accelerograms recorded on the subduction zone on the Pacific Coast of Mexico. The nonlinear responses under different damage scenarios for the bridges included in the presented study were estimated. These results allow determining the seismic capacity of the bridges with and without base isolation. Results show clearly the importance of considering the nonlinear behaviour on the seismic performance of bridges and the influence of base isolation on the seismic vulnerability of medium size bridges.

Performance of high-damping rubber bearings for seismic isolation of residential buildings in Turkey

2021 ◽  
Vol 143 ◽  
pp. 106620
Author(s):  
N. Murota ◽  
S. Suzuki ◽  
T. Mori ◽  
K. Wakishima ◽  
B. Sadan ◽  
...  
Keyword(s):  
Seismic Isolation ◽  
Residential Buildings ◽  
High Damping Rubber Bearings ◽  
High Damping Rubber ◽  
Rubber Bearings

Seismic Response Prediction of Base Isolated Multi-Span Highway Bridge with Different Modeling Techniques for Lead Rubber Bearings

2012 ◽  
Vol 18 (12) ◽  
pp. 1227-1234
Author(s):  
Muhammad Kashif Razzaq ◽  
Yoshiaki Okui ◽  
Hiroshi Mitamura ◽  
Takashi Imai
Keyword(s):  
Seismic Response ◽  
Response Prediction ◽  
Highway Bridge ◽  
Modeling Techniques ◽  
Lead Rubber Bearings ◽  
Rubber Bearings

scholarly journals ULTIMATE LOAD CAPACITY OF NATURAL RUBBER BEARINGS

1996 ◽  
Vol 61 (482) ◽  
pp. 43-51 ◽  
Author(s):  
Mineo TAKAYAMA ◽  
Keiko MORITA ◽  
Hideyuki TADA
Keyword(s):  
Natural Rubber ◽  
Ultimate Load ◽  
Load Capacity ◽  
Ultimate Load Capacity ◽  
Rubber Bearings

An Investigation of Adaptive Rubber Bearings

2016 ◽  
Author(s):  
C. S. Tsai ◽  
Hui-Chen Su ◽  
Wen-Chun Huang
Keyword(s):  
Yield Strength ◽  
Lower Yield ◽  
Passive Devices ◽  
Major Benefit ◽  
Lead Rubber Bearings ◽  
Lower Yield Strength ◽  
Multiple Levels ◽  
Materials Used ◽  
Rubber Bearings ◽  
Stiffness And Damping

Proposed in this study are several innovative seismic isolators composed of rubber materials that are called adaptive rubber bearings based on their adaptive characteristics. The materials used in the proposed isolators are free of lead commonly found in lead rubber bearings. The lead material results in a heavy environmental burden as well as lower yield strength and damping due to rising temperature during earthquakes, and thus causes larger displacements than we would expect. The designed mechanisms in the proposed isolators enable these devices to be manufactured relatively easily. They also provide extremely high damping to bearings, which is strongly desired by engineers in practice. The proposed rubber bearings are completely passive devices yet possess adaptive stiffness and adaptive high damping. The change in stiffness and damping is predictable and can be calculated at specifiable and controllable displacement amplitudes. The major benefit of the adaptive characteristics of seismic isolators is that a given system can be optimized separately for multiple performance objects at multiple levels of earthquakes. In this study, mathematical formulations are derived to explain the mechanisms of the proposed devices. Experimental results of high velocity cyclical loadings are also provided to verify the advanced concepts of the proposed devices.

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