ID 111859
Author
Liao, Kuo-Wei National Taiwan University
Gitomarsono, Jessica National Taiwan University of Science and Technology
Keywords
seismic excitation
reliability analysis
multi-hazards
scour depth
displacement ductility
Content Type
Journal Article
Description
This study proposes a bridge safety evaluation process against seismic and flood hazards. Because uncertainties in the scours, seismic hazard, and structural performance for a given seismic excitation are inevitable and important, reliability analysis is adopted. A scour prediction equation for a bridge with a complicated foundation system is developed and a probabilistic scour curve is constructed to measure the risk of scours using the Monte Carlo simulation. The seismic hazard is measured using the probabilistic seismic-hazard analysis. A series of nonlinear time-history analyses are performed to determine the structural performance under different peak-ground-acceleration values. SAP2000 is used to build the finite-element model wherein the soil is modeled using a bilinear link. A plastic hinge is predefined to simulate the nonlinear behaviors of the pier and caisson of the bridge. The displacement ductility is used to measure the structural performance and to construct the fragility curve for various limit states. The Nanyun Bridge located in central Taiwan is selected as an example to demonstrate the proposed safety-evaluation procedure. The results show that the probable scour depth of the Nanyun bridge is from 3 to 5 m. The failure probability considering the floods and earthquakes is insignificant. A deterministic design value, considering both the hazards, is provided for a given reliability target (e.g., β=3) to help engineers in their present design processes.
Journal Title
Journal of Performance of Constructed Facilities
ISSN
08873828
19435509
NCID
AA10670027
AA11956706
Publisher
American Society of Civil Engineers
Volume
32
Issue
3
Start Page
04018017
Published Date
2018-03-27
Rights
This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at https://doi.org/10.1061/(ASCE)CF.1943-5509.0001153.
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Author
departments
Science and Technology