Keywords and Phrases
Bridge Columns; Finite Element; Rubberized Concrete; Segmental Columns; Seismic Resistant; Shaking Table
“This dissertation provides innovative alternative solutions for replacing conventional reinforced concrete columns. The proposed columns displayed enhanced seismic resistance and properties compared to their counterpart conventional columns. Two main techniques were followed and proposed to develop seismic-resistant columns. The first technique utilized rubberized concrete to internally enhance energy dissipation and damping. Materials testing of rubberized concrete with scrap tire replacement of fine aggregates were performed to evaluate its dynamic properties. Shaking table testing of a rubberized concrete column was performed and the behavior was compared to that of the conventional one. The rubberized column showed an increase of 16% in energy dissipation compared to the conventional column. This solution also had the benefit of using recycled tire rubber, which produced green concrete. The second technique utilized post-tensioned segmental columns with double-skin cross section and external energy dissipaters. Three columns with different configurations were tested on the shaking table and compared with the conventional column. These columns outperformed the conventional column; especially regarding the residual drift. The peak drift for the posttensioned columns was 8.85% with a residual drift of 0.08% compared to 4.8% peak drift with 1.5% residual drift for the conventional column. Three-dimensional finite element models for the post-tensioned columns were developed using LS-DYNA software. The effects of ground motion characteristics including far-field motions, near-fault motions without forward-directivity, near-fault motions with forward-directivity, and near-fault motions with fling-step on full-scale column models were investigated. An analytical model for the design of post-tensioned columns was provided”--Abstract, page iv.
Schonberg, William P.
Volz, Jeffery S.
Civil, Architectural and Environmental Engineering
Ph. D. in Civil Engineering
Missouri University of Science and Technology
Journal article titles appearing in thesis/dissertation
- Mechanical properties of high strength concrete with scrap tire rubber
- Dynamic properties of high strength rubberized concrete
- Strain rate effect on properties of rubberized concrete confined with glass fiber reinforced polymers
- Seismic response of high energy dissipating rubberized concrete columns: shaking table testing
- Shaking table testing of damage-resistant segmental double-skin bridge columns
- Seismic behavior of damage-resistant segmental hollow-core bridge columns for accelerated bridge construction
- Effects of ground motion type on the behavior of segmental post-tensioned bridge columns
xxvii, 299 pages
© 2016 Ayman A. Moustafa, All rights reserved.
Dissertation - Open Access
Electronic OCLC #
Moustafa, Ayman A., "Innovative techniques for seismic-resistant bridge columns under ground motion excitations" (2016). Doctoral Dissertations. 3106.