Control of seismically isolated bridges by magnetorheological dampers and a rolling pendulum system

2011 ◽  
Vol 19 (2) ◽  
pp. 278-294 ◽  
Author(s):  
Pei-Yang Lin ◽  
Tzu-Kang Lin
Keyword(s):  
Magnetorheological Dampers ◽  
Pendulum System ◽  
Seismically Isolated ◽  
Isolated Bridges

Extraction of hysteretic properties of seismically isolated bridges from quick-release field tests

2001 ◽  
Vol 31 (2) ◽  
pp. 333-351 ◽  
Author(s):  
Qingbin Chen ◽  
Bruce M. Douglas ◽  
Emmanuel A. Maragakis ◽  
Ian G. Buckle
Keyword(s):  
Field Tests ◽  
Quick Release ◽  
Release Field ◽  
Seismically Isolated ◽  
Isolated Bridges ◽  
Hysteretic Properties

scholarly journals Improvements to the simplified analysis method for the design of seismically isolated bridges in CSA-S6-14

2016 ◽  
Vol 43 (10) ◽  
pp. 897-907
Author(s):  
Viacheslav Koval ◽  
Constantin Christopoulos ◽  
Robert Tremblay
Keyword(s):  
North America ◽  
Seismic Isolation ◽  
Time History ◽  
Equivalent Damping ◽  
Damping Coefficients ◽  
Simplified Method ◽  
Simplified Analysis ◽  
Seismically Isolated ◽  
Nonlinear Time History ◽  
Isolated Bridges

The design provisions for seismically isolated bridges in the CAN/CSA-S6 Canadian Highway Bridge Design Code and the AASHTO Guide Specifications for Seismic Isolation Design ( AASHTO 2010 , 2014 ) have been developed primarily based on ground motions recorded along the west coast of North America. Both codes include a simplified analysis procedure that relies on an equivalent effective linearization of the nonlinear isolated structure together with damping coefficients to account for the effect of energy dissipation on the response of the isolated system. The appropriateness and range of application of code-specified simplified methods were investigated through nonlinear time-history analyses to propose improvements to this procedure for the new edition of the CSA-S6-2014 code. Based on these analyses, new damping coefficients are proposed for Eastern North America (ENA) and new limits for the application of the simplified method are defined. For ENA, the method with newly proposed damping coefficients can give good bridge displacement estimates for equivalent damping ratios of up to 40%, which broadens the possible designs that can be achieved using the simplified method. This study also showed that applicability limits could be defined more accurately as a function of the system properties.

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