Thesis
Nonlinear dynamic and static analysis of I-5 Ravenna Bridge
Washington State University
Master of Science (MS), Washington State University
2008
Handle:
https://hdl.handle.net/2376/102421
Abstract
The Washington State Department of Transportation (WSDOT) developed a bridge seismic retrofit program in 1990 in order to address seismic risk associated with state owned bridges. Of particular interest are bridges with multiple column bents and those founded on precast/prestressed hollow core concrete piles. A number of deficiencies in the seismic behavior of these piles were observed. They have minimal energy-absorbing hysteretic behavior, and failure in such piles is sudden and violent. Knowing the behavioral properties of prestressed hollow core piles, a typical bridge built on them was evaluated for seismic loading. The outcome for this task is knowledge of the failure mechanisms for this type of bridge, the forces required for various levels of failure, and a definition of the earthquake magnitude that will cause failure. Two types of analysis were performed: pushover analysis and nonlinear dynamic analysis. The same type of structural model was used for both. A three-dimensional "spine" model of the bridge was developed using SAP2000 (2007), including modeling of the bridge bearings, expansions joints, and soil-structure interaction. The dynamic nonlinear response of the bridge was investigated by using three ground motions with different return periods. The nonlinear static response of the bridge was investigated using different variants of capacity spectrum methods. Nonlinear static analysis provided poor results compared to nonlinear dynamic analysis, due to higher mode effects. Results of both nonlinear static and dynamic analysis showed that the piles fail in a brittle fashion under seismic loading. Using results from 3D finite element analysis of the piles and pile-crossbeam connection, a more advanced spine model was created. The pile-crossbeam connection improved the strength of the bridge. The effect of foundation soil flexibility was examined by running analysis on three different soil types and comparing the results. Dense sand proved to be the most conservative soil model. Also, the effects on the seismic demand due to period lengthening and damping increase produced by structural deterioration were evaluated.
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Details
- Title
- Nonlinear dynamic and static analysis of I-5 Ravenna Bridge
- Creators
- Reza Shafiei-Tehrany
- Contributors
- Mohamed ElGawady (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525152601842
- Language
- English
- Resource Type
- Thesis