Reliability of transportation lifeline systems subjected to earthquake loads

Topkara Özcan, Naz
Lifelines, such as highway, gas, water and power distribution systems, are networks which extend spatially over large geographical regions. The assessment of the reliability of a lifeline under seismic loads requires particular attention, since the proper functioning of these systems during or after a destructive earthquake is very important. The main objective of this study is to investigate the system reliability of lifeline networks subjected to earthquake loads by concentrating on highway systems consisting of viaducts, bridges, roads and highways. System reliability analysis basically evaluates the performance of a system in terms of the reliability of its components. Reliability of a structural component which is subjected to earthquake forces is determined based on the seismic capacity of the structure and earthquake loads on the structure. In this study, determination of the future earthquake threat on the components is calculated by performing a probabilistic seismic hazard analysis. Failure reasons of bridges and asphalt roads are explained and behaviors of these components under earthquake loads are discussed to determine the seismic capacity of them. In this respect, the system reliability concepts are utilized and bounds on the seismic reliability of a system are established. A case study based on real life data is also presented in order to illustrate the implementation of the method.
Citation Formats
N. Topkara Özcan, “Reliability of transportation lifeline systems subjected to earthquake loads,” M.S. - Master of Science, Middle East Technical University, 2016.