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Parthena-Maria K. Kosmidou
Reinforced Concrete and Seismic Design of Structures Laboratory, Civil Engineering Department, School of Engineering, Democritus University of Thrace, Xanthi 67100, Greece.

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Journal article
Published: 29 April 2019 in Materials
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Reinforced concrete (RC) beams under cyclic loading usually suffer from reduced aggregate interlock and eventually weakened concrete compression zone due to severe cracking and the brittle nature of compressive failure. On the other hand, the addition of steel fibers can reduce and delay cracking and increase the flexural/shear capacity and the ductility of RC beams. The influence of steel fibers on the response of RC beams with conventional steel reinforcements subjected to reversal loading by a four-point bending scheme was experimentally investigated. Three slender beams, each 2.5 m long with a rectangular cross-section, were constructed and tested for the purposes of this investigation; two beams using steel fibrous reinforced concrete and one with plain reinforced concrete as the reference specimen. Hook-ended steel fibers, each with a length-to-diameter ratio equal to 44 and two different volumetric proportions (1% and 3%), were added to the steel fiber reinforced concrete (SFRC) beams. Accompanying, compression, and splitting tests were also carried out to evaluate the compressive and tensile splitting strength of the used fibrous concrete mixtures. Test results concerning the hysteretic response based on the energy dissipation capabilities (also in terms of equivalent viscous damping), the damage indices, the cracking performance, and the failure of the examined beams were presented and discussed. Test results indicated that the SFRC beam demonstrated improved overall hysteretic response, increased absorbed energy capacities, enhanced cracking patterns, and altered failure character from concrete crushing to a ductile flexural one compared to the RC beam. The non-fibrous reference specimen demonstrated shear diagonal cracking failing in a brittle manner, whereas the SFRC beam with 1% steel fibers failed after concrete spalling with satisfactory ductility. The SFRC beam with 3% steel fibers exhibited an improved cyclic response, achieving a pronounced flexural behavior with significant ductility due to the ability of the fibers to transfer the developed tensile stresses across crack surfaces, preventing inclined shear cracks or concrete spalling. A report of an experimental database consisting of 39 beam specimens tested under cyclic loading was also presented in order to establish the effectiveness of steel fibers, examine the fiber content efficiency and clarify their role on the hysteretic response and the failure mode of RC structural members.

ACS Style

Constantin E. Chalioris; Parthena-Maria K. Kosmidou; Chris G. Karayannis. Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams; an Experimental Study. Materials 2019, 12, 1398 .

AMA Style

Constantin E. Chalioris, Parthena-Maria K. Kosmidou, Chris G. Karayannis. Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams; an Experimental Study. Materials. 2019; 12 (9):1398.

Chicago/Turabian Style

Constantin E. Chalioris; Parthena-Maria K. Kosmidou; Chris G. Karayannis. 2019. "Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams; an Experimental Study." Materials 12, no. 9: 1398.

Journal article
Published: 14 December 2018 in Fibers
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Innovative reinforcement as fiber-reinforced polymer (FRP) bars has been proposed as alternative for the substitution of the traditional steel bars in reinforced concrete (RC) structures. Although the advantages of this polymer reinforcement have long been recognised, the predominantly elastic response, the reduced bond capacity under repeated load and the low ductility of RC members with FRP bars restricted its wide application in construction so far. In this work, the behavior of seven slender concrete beams reinforced with carbon-FRP bars under increasing static loading is experimentally investigated. Load capacities, deflections, pre-cracking and after-cracking stiffness, sudden local drops of strength, failure modes, and cracking propagation have been presented and commented. Special attention has been given in the bond conditions of the anchorage lengths of the tensile carbon-FRP bars. The application of local confinement conditions along the anchorage lengths of the carbon-FRP bars in some specimens seems to influence their cracking behavior. Nevertheless, more research is required in this direction. Comparisons of experimental results for carbon-FRP beams with beams reinforced with glass-FRP bars extracted from recent literature are also presented and commented. Comparisons of the experimental results with the predictions according to ACI 440.1R-15 and to CSA S806-12 are also included herein.

ACS Style

Chris G. Karayannis; Parthena-Maria K. Kosmidou; Constantin E. Chalioris. Reinforced Concrete Beams with Carbon-Fiber-Reinforced Polymer Bars—Experimental Study. Fibers 2018, 6, 99 .

AMA Style

Chris G. Karayannis, Parthena-Maria K. Kosmidou, Constantin E. Chalioris. Reinforced Concrete Beams with Carbon-Fiber-Reinforced Polymer Bars—Experimental Study. Fibers. 2018; 6 (4):99.

Chicago/Turabian Style

Chris G. Karayannis; Parthena-Maria K. Kosmidou; Constantin E. Chalioris. 2018. "Reinforced Concrete Beams with Carbon-Fiber-Reinforced Polymer Bars—Experimental Study." Fibers 6, no. 4: 99.

Journal article
Published: 25 July 2018 in Fibers
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The effectiveness of a new retrofitting technique to upgrade the structural behaviour of reinforced concrete (RC) deep beams without steel stirrups using carbon fibre-reinforced polymer (CFRP) ropes as the only transverse shear reinforcement is experimentally investigated. Five shear-critical beams with rectangular and T-shaped cross-section are tested under monotonic loading. The strengthening schemes include (a) one vertical and one diagonal single-link CFRP rope that are internally applied through the web of the rectangular beam using an embedded through-section (ETS) system and (b) two vertical U-shaped double-link ropes that are applied around the perimeter of the web of the flanged beam using a near-surface-mounted (NSM) system. In both cases, the free lengths of the CFRP ropes have been properly anchored using epoxy bonded lap splices of the rope as NSM at (a) the top and the bottom of the web of the rectangular beam and (b) the top of the slab of the T-beam. Promising results have been derived, since the proposed strengthening technique enhanced the strength and altered the brittle shear failure to a ductile flexural one. The experimental results of this study were also used to check the validity of an analytical approach to predict the strength of shear strengthened deep beams using FRP ropes as transverse link reinforcement.

ACS Style

Constantin E. Chalioris; Parthena-Maria K. Kosmidou; Nikos A. Papadopoulos. Investigation of a New Strengthening Technique for RC Deep Beams Using Carbon FRP Ropes as Transverse Reinforcements. Fibers 2018, 6, 52 .

AMA Style

Constantin E. Chalioris, Parthena-Maria K. Kosmidou, Nikos A. Papadopoulos. Investigation of a New Strengthening Technique for RC Deep Beams Using Carbon FRP Ropes as Transverse Reinforcements. Fibers. 2018; 6 (3):52.

Chicago/Turabian Style

Constantin E. Chalioris; Parthena-Maria K. Kosmidou; Nikos A. Papadopoulos. 2018. "Investigation of a New Strengthening Technique for RC Deep Beams Using Carbon FRP Ropes as Transverse Reinforcements." Fibers 6, no. 3: 52.

Book chapter
Published: 06 May 2015 in Advances in Civil Engineering and Building Materials
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ACS Style

P Kosmidou; Ch Kalfas; D Pachoumis. Numerical study of blind-bolted moment connections of hollow sections. Advances in Civil Engineering and Building Materials 2015, 187 -192.

AMA Style

P Kosmidou, Ch Kalfas, D Pachoumis. Numerical study of blind-bolted moment connections of hollow sections. Advances in Civil Engineering and Building Materials. 2015; ():187-192.

Chicago/Turabian Style

P Kosmidou; Ch Kalfas; D Pachoumis. 2015. "Numerical study of blind-bolted moment connections of hollow sections." Advances in Civil Engineering and Building Materials , no. : 187-192.