Thesis
Seismic behavior and design of segmental precast post-tensioned concrete piers
Washington State University
Master of Science (MS), Washington State University
2010
Handle:
https://hdl.handle.net/2376/101635
Abstract
Segmental precast post tensioned (SPPT) bridge pier is an economical construction system, and a re-centering structural system. Understanding the seismic behavior of the SPPT system is an important step towards its application in high seismic zones. First, the thesis presents a detailed three dimensional finite element model developed using the ABAQUS platform. A brief description and discussion of cyclic tests on eight large scale SPPT piers was also presented. The finite element model was validated against the experimental results and it showed good agreement. Sensitivity analyses using the finite element model showed that the model is sensitive to the softening behavior of the concrete material constitutive law. Then, the FE model was used to discuss the design parameters that potentially affect the lateral seismic response of the SPPT bridge piers. Design parameters investigated include the initial post-tensioning stress as a percentage of the tendon yield stress, the applied axial stresses on concrete due to post-tensioning, pier aspect ratios, construction details, steel tube thicknesses, and internal mild steel rebar added as energy dissipaters. After that, the FE model was validated against two experimental studies conducted at Washington State University. The SPPT piers were tested as single piers in the first study while two SPPT piers were connected from the top with a reinforced concrete beam to form a moment resistant bent in the second study. The FE model showed good agreement with the backbone behavior of the tested specimens. A parametric study was carried out to study the effect of piers dimensions, post-tensioning and external service loads on full scale FE models. Finally, a large set of FE models of piers with different design parameters was used to develop a set of empirical equations. These equations were incorporated into a design procedure for the SPPT concrete piers.
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Details
- Title
- Seismic behavior and design of segmental precast post-tensioned concrete piers
- Creators
- Haitham Mohamed Mahmoud Mousad Dawood
- 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, Wash. :
- Identifiers
- 99900525112101842
- Language
- English
- Resource Type
- Thesis