Time-dependent seismic reliability of isolated bridges considering ageing deterioration of lead rubber bearings
- 22 April 2022
- journal article
- research article
- Published by Taylor & Francis Ltd in Structure and Infrastructure Engineering
- Vol. 18 (10-11), 1526-1541
- https://doi.org/10.1080/15732479.2022.2063907
Abstract
Seismic isolation is an effective technology for mitigating the seismic damage to bridges. However, rupture and large cracks of laminated rubber bearings, including lead rubber bearings, have occurred at several bridges during recent earthquakes. Preventing the rupture of seismic isolators by considering uncertainties and variations in the mechanical properties due to ageing deterioration can improve the ductility capacity of the bridge systems when subjected to extreme ground motions. This study presents a time-dependent seismic reliability assessment methodology for isolated bridges that considers long-term ageing deterioration of lead rubber bearings. The effects of capacity hierarchy between the isolator and the column, as well as the ageing deterioration of isolators on the seismic reliability and the predominant ultimate failure mode were clarified. It was found that the effect of ageing deterioration of lead rubber bearings on seismic reliability is relatively smaller than that of the difference in seismic hazards at different sites. Furthermore, the seismic safety of isolated bridges can be significantly improved by setting an adequate capacity hierarchy between the isolator and the column, as it can prevent the rupture of the isolator under extreme ground motions considering the ageing deterioration of the isolator.Keywords
Funding Information
- JSPS KAKENHI (JP19K04568)
This publication has 43 references indexed in Scilit:
- Seismic fragility assessment of SMA-bar restrained multi-span continuous highway bridge isolated by different laminated rubber bearings in medium to strong seismic risk zonesBulletin of Earthquake Engineering, 2012
- Life‐cycle reliability of RC bridge piers under seismic and airborne chloride hazardsEarthquake Engineering & Structural Dynamics, 2011
- Ageing Behaviour of Natural Rubber and High Damping Rubber Materials Used in Bridge Rubber BearingsAdvances in Structural Engineering, 2010
- Reliability-based capacity design for reinforced concrete bridge structuresStructure and Infrastructure Engineering, 2010
- Equivalent linear stochastic seismic response of isolated bridgesJournal of Sound and Vibration, 2008
- Effect of isolation on fragility curves of highway bridges based on simplified approachSoil Dynamics and Earthquake Engineering, 2007
- STUDY ON THE DETERIORATION CHARACTERISTICS OF NATURAL RUBBER BEARINGSDoboku Gakkai Ronbunshuu A, 2006
- Effect of isolator and ground motion characteristics on the performance of seismic-isolated bridgesEarthquake Engineering & Structural Dynamics, 2005
- INVESTIGATION OF FALLING ON CONCRETE FRAGMENTS FROM RC STRUCTURESDoboku Gakkai Ronbunshu, 2002
- Incremental dynamic analysisEarthquake Engineering & Structural Dynamics, 2001