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.

• Record URL:
  • https://doi.org/10.1061/9780784481332.031
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784481332
• Supplemental Notes:
  • © 2018 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Zhang, Qi
  • Alam, M Shahria
• Conference:
  • Structures Congress 2018
  • Location: Fort Worth Texas, United States
  • Date: 2018-4-19 to 2018-14-21
• Publication Date: 2018-4

Language

• English

Media Info

• Media Type: Web
• Pagination: pp 349-358
• Monograph Title: Structures Congress 2018: Bridges, Transportation Structures, and Nonbuilding Structures

Subject/Index Terms

• TRT Terms: Bridge piers; Columns; Posttensioning; Precast concrete
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 01872158
• Record Type: Publication
• ISBN: 9780784481332
• Files: TRIS, ASCE
• Created Date: Jan 30 2023 4:47PM