Prestressing of NSM steel strands to enhance the structural performance of prestressed concrete beams

Obaydullah, M. and Jumaat, Mohd Zamin and Alengaram, Ubagaram Johnson and Darain, K.M.U. and Huda, M.N. and Hosen, M.A. (2016) Prestressing of NSM steel strands to enhance the structural performance of prestressed concrete beams. Construction and Building Materials, 129. pp. 289-301. ISSN 0950-0618, DOI

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Prestressing of strengthening materials can enhance the performance of strengthened structures as the materials become more efficient as a greater portion of their tensile capacity is employed. Prestressed concrete beams are widely used in the construction field, however, there is a lack of studies on the strengthening of these structural elements. This paper presents an experimental study on strengthening prestressed beams using near surface mounted (NSM) prestressed steel strands. A total of seven prestressed beams were constructed for static testing, with one unstrengthened control beam, one beam strengthened with a non-prestressed NSM steel strand, and five beams strengthened with NSM steel strands prestressed to varying levels of their nominal tensile strength. The structural behavior and failure modes of these specimens were investigated and the differences in performance due to the effect of the prestressing force in the NSM strands were analyzed. Based on the results, applying prestress force provides an increase in load carrying capacity with corresponding higher concrete cracking and steel yielding initiations when compared to beams strengthened with no added prestress force. The influence of various prestress levels on the deflection of the tested beams was also assessed, and the relevant results were presented and discussed. The test results showed that the strengthened prestressed beam with a 70% prestressed steel strand performed better compared to the other strengthened beams. The first crack load, yield load and ultimate load of the prestressed beam strengthened with a 70% prestressed steel strand increased by 40%, 57% and 40%, respectively, compared to the control beam.

Item Type: Article
Funders: University of Malaya, Grand Challenge – SUS (Sustainability Science) Grant, project number GC003A-15SUS: “Development of Effective Repair and Rehabilitation Material Consisting Local Waste Materials for Affordable Housing”
Uncontrolled Keywords: Prestress; Concrete; Beam; NSM; Steel; Strand; Strengthening; Structural performance; Prestressing level
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering > Department of Civil Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 14 Aug 2017 02:53
Last Modified: 05 Feb 2020 04:48

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