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A platform for research: civil engineering, architecture and urbanism
The Dynamics of Precast Post-Tensioned Rocking Columns
Precast post-tensioned column is a novel structural system that can be used as bridge piers. In such a system, the column does not have a moment connection with the foundation, therefore the rocking mechanism combining with post-tensioned force provides excellent deformation and re-centering capacity. The columns can be comprised of multiple segments or a single segment. This study examines the dynamic behaviors of post-tensioned columns under seismic excitations. The equations of motion are developed using Lagrange’s method and solved using fourth-order Runge-Kutta method. The effects of impacts, tendon stiffness, initial post-tensioning force, and characteristic of applied loadings on the dynamic behaviors are investigated. Results show that the vibration period increases with the increases in rotational amplitude. The increase in the tendon stiffness increases vibration frequency. Under sine and cosine pulse with the same amplitude and period, the rocking responses are different in terms of rocking amplitude. The use of post-tensioning tendons can help to reduce rotational amplitude and delay the initiation of rocking.
The Dynamics of Precast Post-Tensioned Rocking Columns
Precast post-tensioned column is a novel structural system that can be used as bridge piers. In such a system, the column does not have a moment connection with the foundation, therefore the rocking mechanism combining with post-tensioned force provides excellent deformation and re-centering capacity. The columns can be comprised of multiple segments or a single segment. This study examines the dynamic behaviors of post-tensioned columns under seismic excitations. The equations of motion are developed using Lagrange’s method and solved using fourth-order Runge-Kutta method. The effects of impacts, tendon stiffness, initial post-tensioning force, and characteristic of applied loadings on the dynamic behaviors are investigated. Results show that the vibration period increases with the increases in rotational amplitude. The increase in the tendon stiffness increases vibration frequency. Under sine and cosine pulse with the same amplitude and period, the rocking responses are different in terms of rocking amplitude. The use of post-tensioning tendons can help to reduce rotational amplitude and delay the initiation of rocking.
The Dynamics of Precast Post-Tensioned Rocking Columns
Zhang, Qi (author) / Alam, M. Shahria (author)
Structures Congress 2018 ; 2018 ; Fort Worth, Texas
Structures Congress 2018 ; 349-358
2018-04-17
Conference paper
Electronic Resource
English
The Dynamics of Precast Post-Tensioned Rocking Columns
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