Probabilistic Seismic Assessment of Structure, Foundation, and Soil Interacting Systems

Seismic vulnerability curves of a highway overcrossing bridge in the Central and Eastern United States (CEUS) are derived employing the aforementioned methods with and without soil-structure interaction. Four different approaches of Soil-Structure Interaction (SSI) are tried: (a) Abutments and foundations are assumed to be fixed, (b) Conventional lumped spring approaches are adopted to model abutments and foundations, (c) Lumped springs for abutments and foundations are estimated from Finite Element (FE) analysis of geotechnical system, and (d) Multiplatform simulation is conducted. All four of the methods shows that abutment bearings in transverse direction are most vulnerable components. Failure probability of the bridge system is highly dependent on the failure probability of abutment bearings. Among the four approaches, the fixed foundation approach underestimated the failure probability of all bridge components except abutment bearings in transverse direction. Considering that simplified methods for SSI analysis include larger assumptions than fully coupled methods and that the multiplatform simulation is verified with measured responses from instrumented bridge, the use of multiplatform simulation is suggested if computational power and resources for FE modeling are affordable.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Civil Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Kwon, Oh-Sung

Contributors dc:contributor

• Elnashai, Amr S.

• Engineering, Civil

Language dc:language

eng

Identifier

(MiAaPQ)AAI3269951

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/83327