Abstract
The main objectives of this study are: encouraging the production and use of self-compacting concrete, use of materials which are lightweight, easy to use, and highly efficient in the retrofitting of reinforced concrete buildings. Six deep beams specimens (L= length of 1400mm, h= height of 400mm, and b= width of 150mm) were cast using self-compacting concrete. The location of the openings is in the middle of assumed load path. Five patterns were adopted to arrange carbon fiber reinforced polymer (CFRP) strips. The cylinder compressive strength of the concrete was approximately equal for all beams and was about (44 MPa) at 28 days age. All the beams have the same steel reinforcement for shear and flexure. There have been many tests for fresh and hardened concrete. The reinforced concrete deep beams were tested up to (60%) of the ultimate load of control beams to simulate degree of damage, and then released the load. After that, the beams were retrofitted using (CFRP) strips, and then the beams were tested to failure. The study was focused on determining the vertical mid-span deflection, ultimate load, the load that causes first shear and flexural cracks, and mode of failure. The results showed that, the best increase in the ultimate failure load was (27.27%) and achieved using the inclined strips pattern and the pattern of vertical and horizontal strips together. Reduction in the deflection values for the retrofitted beams compared to the control beam by about (12-13%) due to restrictions imposed by CFRP strips and the...
Highlights
Deep beams are structural elements loaded as simple beams in which a significant amount of the load is carried to the supports by a compression force combining the load and the reaction
The objective of the present paper is to investigate which of the five patterns of arrangements and distribution of carbon fiber strips gives the highest amount of increase in the ultimate failure load after retrofitted process
The improvement in load capacity was 18.2% compared with ultimate failure load of the control beam
Summary
Deep beams are structural elements loaded as simple beams in which a significant amount of the load is carried to the supports by a compression force combining the load and the reaction. The typical remediation for such conditions includes the installation of structural steel frames and other elements, to provide additional strength to support the existing concrete. Carbon fiber reinforced polymer (CFRP) is an alternative material that is able to provide strengthening effects, with much lower weight. CFRP is a material composed of carbon fibers as a first material and a polymer resin (sometimes called the epoxy paste) as a second material. Five patterns of CFRP strips were adopted to retrofit five deep beams. The objective of the present paper is to investigate which of the five patterns of arrangements and distribution of carbon fiber strips gives the highest amount of increase in the ultimate failure load after retrofitted process
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