Experimental and analytical studies of seismic response of highway bridges isolated by rate-dependent rubber bearings

2017 ◽  
Vol 150 ◽  
pp. 288-299 ◽  
Author(s):  
Yong Yuan ◽  
Wei Wei ◽  
Akira Igarashi ◽  
Ping Tan ◽  
Hirokazu Iemura ◽  
...  
Keyword(s):  
Seismic Response ◽  
Highway Bridges ◽  
Rate Dependent ◽  
Analytical Studies ◽  
Rubber Bearings

Influence of Mullins and hardening effects of seismic isolation rubber bearings on the seismic response

2021 ◽  
Author(s):  
Hiroshi Shimmyo ◽  
Tolga Onal ◽  
Shozo Nakamura ◽  
Kazuya Tokunaga
Keyword(s):  
Seismic Response ◽  
Seismic Isolation ◽  
Hysteresis Loops ◽  
Highway Bridges ◽  
Restoring Force ◽  
Two Factors ◽  
Product Test ◽  
Rubber Bearings ◽  
Isolated Bridges ◽  
Force Displacement

<p>In the current Specifications for Highway Bridges of the Japan Road Association, a bilinear force- displacement relationship is recommended as the hysteresis loops of the seismic isolation rubber bearings for the dynamic structural analysis of seismically isolated bridges. However, it has been confirmed that the restoring force characteristics of the actual devices are different from the bilinear model due to the Mullins effect and the hardening phenomenon of the rubber under large shear strains. In this study, the effect of these two factors on the seismic response of a bridge is investigated through the dynamic analysis with the tri-linear double target model considering the factors. The parameters of the model are obtained from product test results of lead-plugged laminated rubber bearings and high-damping laminated rubber bearings.</p>

scholarly journals Probabilistic seismic response analysis of coastal highway bridges under scour and liquefaction conditions: does the hydrodynamic effect matter?

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Xiaowei Wang ◽  
Yutao Pang ◽  
Aijun Ye
Keyword(s):  
Seismic Response ◽  
Seismic Design ◽  
Highway Bridges ◽  
Element Model ◽  
Response Analysis ◽  
Hydrodynamic Effect ◽  
Strong Earthquakes ◽  
Influence Of Water ◽  
Scour Hazard ◽  
Ground Motion Records

AbstractCoastal highway bridges are usually supported by pile foundations that are submerged in water and embedded into saturated soils. Such sites have been reported susceptible to scour hazard and probably liquefied under strong earthquakes. Existing studies on seismic response analyses of such bridges often ignore the influence of water-induced hydrodynamic effect. This study assesses quantitative impacts of the hydrodynamic effect on seismic responses of coastal highway bridges under scour and liquefaction potential in a probabilistic manner. A coupled soil-bridge finite element model that represents typical coastal highway bridges is excited by two sets of ground motion records that represent two seismic design levels (i.e., low versus high in terms of 10%-50 years versus 2%-50 years). Modeled by the added mass method, the hydrodynamic effect on responses of bridge key components including the bearing deformation, column curvature, and pile curvature is systematically quantified for scenarios with and without liquefaction across different scour depths. It is found that the influence of hydrodynamic effect becomes more noticeable with the increase of scour depths. Nevertheless, it has minor influence on the bearing deformation and column curvature (i.e., percentage changes of the responses are within 5%), regardless of the liquefiable or nonliquefiable scenario under the low or high seismic design level. As for the pile curvature, the hydrodynamic effect under the low seismic design level may remarkably increase the response by as large as 15%–20%, whereas under the high seismic design level, it has ignorable influence on the pile curvature.

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

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
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