Fragility analysis of self-centering prestressed concrete bridge pier with external aluminum dissipators. Issue 8 (August 2017)

• Record Type: Journal Article
• Authors: Cao, Zhiliang; Wang, Hao; Guo, Tong
• Other Names: Chen Bo guest-editor.; Xia Yong guest-editor.
• Is Part Of: Advances in structural engineering. Volume 20:Issue 8(2017)
• Page Start: 1210
• Page End: 1222
• Publication Date: 2017-08
• Subjects: concrete pier -- external dissipator -- fragility analysis -- incremental dynamic analysis -- self-centering; Structural engineering -- Periodicals; Construction, Technique de la; Structural engineering; Periodicals; 624.1
• DOI: 10.1177/1369433216673376
• Languages: English
• ISSNs: 1369-4332

Abstract

A novel self-centering prestressed concrete pier with external energy dissipators has been developed to realize seismic resilient performance and enhanced corrosion-resisting property. Self-centering capacity of the pier is provided by the unbonded post-tensioned tendons and damage is mostly concentrated on the replaceable dissipators. To investigate the seismic behavior of the proposed pier, a detailed analytical model considering interface opening and dissipator deformation was developed and verified through existing cyclic load tests. Based on the proposed model, a prototype reinforced concrete pier and a self-centering prestressed concrete pier with similar backbone curves are designed, and fragility analyses are conducted on the two piers through incremental dynamic analysis. One maximum drift-based performance limit state (i.e. collapse prevention) and two residual drift-based performance limit states (i.e. emergent usage and reconstruction) are defined for seismic capacity evaluation. Fragility curves indicate that the self-centering prestressed concrete pier has a slightly higher peak drift demand owing to its inferior dissipating capacity as compared with the reinforced concrete pier, while sustains a much lower residual drift demand due to its inherent self-centering characteristic.