Seismic performance of buildings with novel self‐centering base isolation system for earthquake resilience

This study presents a novel self‐centering (SC) base isolation system enabled by traditional lead rubber bearing (LRB) incorporating superelastic shape memory alloy (SMA) U‐shaped dampers (hereinafter referred to as SMA‐LRB). This system is particularly suitable for some important structures (e.g.,...

Full description

Saved in:
Bibliographic Details
Published in:Earthquake engineering & structural dynamics Vol. 52; no. 5; pp. 1360 - 1380
Main Authors: Wang, Bin, Chen, Peng, Zhu, Songye, Dai, Kaoshan
Format: Journal Article
Language:English
Published: Bognor Regis Wiley Subscription Services, Inc 01.04.2023
Subjects:
Concrete
Concrete construction
Cyclic loading
Cyclic loads
Damper bearings
Deformation
Dynamic analysis
Earthquake dampers
Earthquake resistance
Earthquakes
flag‐shaped hysteresis loop
Fragility
fragility analysis
Frame structures
Hysteresis loops
Isolation systems
lead rubber bearing
Reinforced concrete
residual deformation
Resilience
Seismic activity
Seismic isolation
Seismic response
self‐centering
Shape memory alloys
superelastic shape memory alloy
Superelasticity
ISSN:0098-8847, 1096-9845
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This study presents a novel self‐centering (SC) base isolation system enabled by traditional lead rubber bearing (LRB) incorporating superelastic shape memory alloy (SMA) U‐shaped dampers (hereinafter referred to as SMA‐LRB). This system is particularly suitable for some important structures (e.g., hospital buildings) that require high seismic performance and rapid recovery of normal serviceability after a severe earthquake. The working mechanism of the SMA‐LRBs is first illustrated, followed by a comparative experimental study on the traditional LRB and the emerging SMA‐LRB. Test results confirm the satisfactory flag‐shaped hysteresis loops of SMA‐LRB associated with significantly reduced residual deformation under cyclic loading. Subsequently, a refined numerical modeling strategy for these bearings is developed. The seismic performances of the SMA‐LRBs are examined systematically through two comparative reinforced concrete (RC) frame buildings, namely, the traditionally isolated and the SC isolated cases under far‐ and near‐field earthquakes. Seismic fragility analyses are further carried out through incremental dynamic analysis (IDA). The seismic responses demonstrate that the SC isolated building can match or improve the behavior of the traditional isolated buildings. Compared with the considerable residual deformation of the traditional isolated system under some earthquake events, the SC isolated system exhibits negligible residual deformation that can significantly avoid normal serviceability disruption while achieving the high‐performance objectives. The SC base isolation system can provide a promising type of advanced seismic protection device for earthquake resilient design.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0098-8847
1096-9845
DOI:10.1002/eqe.3820