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Fragility-Based Improvement of System Seismic Performance for Long-Span Suspension Bridges
Joint Authors
Lu, Guanya
Wang, Kehai
Qiu, Wenhua
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-21, 21 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-09-10
Country of Publication
Egypt
No. of Pages
21
Main Subjects
Abstract EN
In this study, a procedure is developed to evaluate and improve the seismic performance of long-span suspension bridges based on the performance objectives under the fragility function framework.
A common type of suspension bridge in China was utilized in the proposed procedure, considering its approach structures according to earthquake damage experience and fortification criteria.
Component-level fragility curves were derived by probabilistic seismic demand models (PSDMs) using a set of nonlinear time-history analyses that incorporated the related uncertainties such as earthquake motions and structural properties.
In addition, one step that was covered was to pinpoint the capacity limit states of critical components including bearings, pylons, and columns.
The stepwise improved seismic designs were proposed in terms of the component fragility results of the as-built design.
Results of the comparison of improved designs showed that the retrofit measure of the suspension span should be selected based on two attributes, i.e., displacement and force, and the restraint system of the approach bridges was a key factor affecting the reasonable damage sequence.
Necessarily, from the comparison of different system vulnerability models, the mean values of earthquake intensity of system-level fragility function developed by the composite damage state indices were used to assess the overall seismic performance of the suspension bridge.
The results showed that compared to the absolutely serial and serial-parallel assumptions, the defined composite damage indices incorporating the thought of component classification and structural relative importance between the main bridge and approach structures were necessary and were able to derive a good indicator of seismic performance assessment, hence validating the point that the different damage states were dominated by the seismic demands of different structures for the retrofitted bridges.
American Psychological Association (APA)
Lu, Guanya& Wang, Kehai& Qiu, Wenhua. 2020. Fragility-Based Improvement of System Seismic Performance for Long-Span Suspension Bridges. Advances in Civil Engineering،Vol. 2020, no. 2020, pp.1-21.
https://search.emarefa.net/detail/BIM-1122969
Modern Language Association (MLA)
Lu, Guanya…[et al.]. Fragility-Based Improvement of System Seismic Performance for Long-Span Suspension Bridges. Advances in Civil Engineering No. 2020 (2020), pp.1-21.
https://search.emarefa.net/detail/BIM-1122969
American Medical Association (AMA)
Lu, Guanya& Wang, Kehai& Qiu, Wenhua. Fragility-Based Improvement of System Seismic Performance for Long-Span Suspension Bridges. Advances in Civil Engineering. 2020. Vol. 2020, no. 2020, pp.1-21.
https://search.emarefa.net/detail/BIM-1122969
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1122969