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Experimental and analytical investigation of concrete confined by external pre-stressed strips

Moghaddam, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. Abstract:
  3. Strengthening is often a necessary measure to overcome an unsatisfactory deficient situation or where a new code requires the structure or a member of it to be modified to achieve new requirements. In the engineering practice such restraint to lateral dilation, indicated by the name of confinement, has been traditionally provided to compression members through steel transverse reinforcement in the form of spirals, circular hoops or rectangular ties. Steel and concrete jackets are other techniques for providing additional confinement for compression members, too. This paper presents the results of experimental and analytical study on the application of strapping technique for retrofitting of concrete columns. Experimental program included axial compressive tests on cylindrical and prismatic small-scale columns which were actively confined by pre-stressed metal strips. 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 and spacing of confining strips on strength of concrete is studied. Nonlinear Finite element models of tested specimens were also made and analyzed. The observed stress-strain behaviors of columns with different levels of confinement are compared to those obtained from finite element method. © 2009 Taylor & Francis Group
  4. Keywords:
  5. Analytical investigations ; Compression member ; Compressive tests ; Concrete column ; Engineering practices ; Experimental program ; Metal strips ; Non-linear finite element model ; Pre-stressed ; Pretensioning force ; Strength of concrete ; Stress-strain behaviors ; Test results ; Transverse reinforcement ; Concrete construction ; Cylinders (shapes) ; Finite element method ; Repair ; Retrofitting ; Strip metal
  6. Source: Concrete Repair, Rehabilitation and Retrofitting II - Proceedings of the 2nd International Conference on Concrete Repair, Rehabilitation and Retrofitting, ICCRRR, 24 November 2008 through 26 November 2008, Cape Town ; 2009 , Pages 375-376 ; 9780415468503 (ISBN)
  7. URL: https://www.crcpress.com/Concrete-Repair-Rehabilitation-and-Retrofitting-II-2nd-International-Conference/Alexander-Beushausen-Dehn-Moyo/p/book/9780415468503#googlePreviewContainer