Modification in Response of a Bridge Seismically Isolated with Lead Rubber Bearings Exposed to Low Temperature

Teknik Dergi ◽  
2022 ◽  
Author(s):  
Esengül ÇAVDAR ◽  
Gökhan ÖZDEMİR ◽  
Volkan KARUK
Keyword(s):  
Low Temperature ◽  
Lead Rubber Bearings ◽  
Seismically Isolated ◽  
Rubber Bearings

Seismic response of highway viaducts equipped with lead-rubber bearings under low temperature

2020 ◽  
Vol 209 ◽  
pp. 110008
Author(s):  
Pengru Deng ◽  
Zhiping Gan ◽  
Toshiro Hayashikawa ◽  
Takashi Matsumoto
Keyword(s):  
Low Temperature ◽  
Seismic Response ◽  
Lead Rubber Bearings ◽  
Rubber Bearings

scholarly journals APPLICATION OF RHEOLOGY MODELING TO NATURAL RUBBER AND LEAD RUBBER BEARINGS: A SIMPLIFIED MODEL AND LOW TEMPERATURE BEHAVIOR

2012 ◽  
Vol 29 (2) ◽  
pp. 40s-55s
Author(s):  
Muhammad Kashif RAZZAQ ◽  
Yoshiaki OKUI ◽  
Abdur Rahman BHUIYAN ◽  
A.F.M. Saiful AMIN ◽  
Hiroshi MITAMURA ◽  
...  
Keyword(s):  
Low Temperature ◽  
Natural Rubber ◽  
Temperature Behavior ◽  
Simplified Model ◽  
Lead Rubber Bearings ◽  
Rubber Bearings

Effects of temperature and lead core heating on response of seismically isolated bridges under near-fault excitations

2019 ◽  
Vol 22 (14) ◽  
pp. 2966-2981 ◽  
Author(s):  
Hao Wang ◽  
Wen-Zhi Zheng ◽  
Jian Li ◽  
Yu-Qi Gao
Keyword(s):  
Ambient Temperature ◽  
Deformation Model ◽  
Initial Displacement ◽  
Joint Effects ◽  
Near Fault ◽  
Lead Rubber Bearings ◽  
Base Forces ◽  
Seismically Isolated ◽  
Rubber Bearings ◽  
Isolated Bridges

Seismic responses of bridges isolated by lead rubber bearings under near-fault excitations are presented in this article. A bilinear force-deformation model is employed to represent the hysteretic behaviors of lead rubber bearings. The joint effects of ambient temperature, initial displacement, and lead core heating on the responses of seismically isolated bridges are investigated. Nonlinear time history analyses are conducted with the employed hysteretic models of lead rubber bearings. Comparisons of the responses with and without the joint effects are performed, in terms of maximum isolator displacements, maximum isolator forces, and base forces of the piers. Results show that ambient temperature, initial displacement, and lead core heating have significant joint effects on the responses of seismically isolated bridges. When such joint effects are ignored at low temperatures, the maximum isolator displacements could be overestimated, whereas the maximum isolator forces and the base forces could be underestimated. However, as for ambient temperatures above 20°C, the maximum isolator displacements could be underestimated, whereas the maximum isolator forces and the base forces could be overestimated with small maximum isolator displacements and underestimated with large maximum isolator displacements.

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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