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Behavior and modeling of concrete columns confined by external post-tensioned strips

Moghaddam, H ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1061/41016(314)291
  3. Publisher: American Society of Civil Engineers (ASCE) , 2008
  4. Abstract:
  5. This paper presents the results of experimental and analytical study on a new technique of seismic retrofitting of concrete columns. In this technique, standard strapping devices, which are used in the packaging industry, are used to post-tension metal strips around concrete columns. The two ends of the strip are tightened in sealed clamps to maintain the pre-stress force in the strip. Experimental program included axial compressive tests on 30 cylindrical as well as 30 prismatic small-scale columns which were actively confined by pre-stressed metal strips. Longitudinal and lateral strain of concrete and strain in the strips were monitored. Test Results showed significant increase in strength and ductility of columns due to active confinement with metal strips. The effect of various parameters such as pretensioning force in the strip, number of strip layers wrapped around the specimens, details of strip joint and the mechanical volumetric ratio of confining strip on strength of concrete is studied. The observed stress-strain relations of columns with different levels of confinement are compared to those calculated based on Mander's and Madas's confinement models. Nonlinear Finite element models of tested specimens were also made and analyzed to compare with the experimental studies. © 2008 ASCE
  6. Keywords:
  7. Concrete construction ; Concretes ; Ductility ; Metals ; Plasma confinement ; Retrofitting ; Seismology ; Software testing ; Stress-strain curves ; Experimental program ; Non-linear finite element model ; Pretensioning force ; RC structure ; Seismic retrofitting ; Strength and ductilities ; Strength of concrete ; Stress strain relation ; Strip metal
  8. Source: 2008 Structures Congress - Structures Congress 2008: Crossing the Borders, Vancouver, BC, 24 April 2008 through 26 April 2008 ; Volume 314 , 2008 ; 9780784410165 (ISBN)
  9. URL: https://ascelibrary.org/doi/10.1061/41016%28314%29291