Enhancement of seismic performance of beam-column joint connections using high performance fiber reinforced cementitious composites

Saghafi, Mohammad Hossein; Shariatmadar, Hashem

doi:10.1016/j.conbuildmat.2018.05.221

Cited by 63 publications

(23 citation statements)

References 22 publications

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“…In essence, the synthetic microfibers in this study provided additional resistance to the HyFRC during the post-cracking, up to the point of exceeding their tensile limit. This has been proven in various experimental testing involving fibers [ 15 , 42 , 43 ]. The supplementary support at the macro-level cracks was found to eliminate the abrupt shear loads exerted to the Ferro fibers and reduce the excessive shear force, thus allowing a more progressive frictional pull-out of the macro-synthetic fibers to bridge the widening large crack gaps and dissipate the shear energy.…”

Section: Resultsmentioning

confidence: 87%

Effects of Hybridized Synthetic Fibers on the Shear Properties of Cement Composites

et al. 2020

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The use of fibers in cementitious composites yields numerous benefits due to their fiber-bridging capabilities in resisting cracks. Therefore, this study aimed to improve the shear-resisting capabilities of conventional concrete through the hybridization of multiple synthetic fibers, specifically on reinforced concrete structures in seismic-prone regions. For this study, 16 hybrid fiber-reinforced concretes (HyFRC) were developed from the different combinations of Ferro macro-synthetic fibers with the Ultra-Net, Super-Net, Econo-Net, and Nylo-Mono microfibers. These hybrids were tested under direct shear, resulting in improved shear strength of controlled specimens by Ferro-Ultra (32%), Ferro-Super (24%), Ferro-Econo (44%), and Ferro-Nylo (24%). Shear energy was further assessed to comprehend the effectiveness of the fiber interactions according to the mechanical properties, dosage, bonding power, manufactured material, and form of fibers. Conclusively, all fiber combinations used in this study produced positive synergistic effects under direct shear at large crack deformations.

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Section: Resultsmentioning

confidence: 87%

Effects of Hybridized Synthetic Fibers on the Shear Properties of Cement Composites

et al. 2020

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“…These issues have led the search for a better advanced material like High Performing Fibre Reinforced Concrete along with different cementitious composites which addresses these disadvantages due to its good properties, better bond characteristics and higher energy dissipation capacities. According to literature a concrete with a compressive strength greater than 100 MPa [20] [21] [22] [23] is accepted as the Ultra High Performance Fibre Reinforced Concrete which also has a tensile strength of 7-10 MPa [22] [24] [25] [26] along with a flexural strength of greater than 30 MPa [27]. Richard P, Cheyrezy M [28] have reported that the ductility of UHPFRC is 250 times greater than that of normal concrete.…”

Section: Strengthening Techniquesmentioning

confidence: 99%

“…In all the tests the failure of the weaker concrete occurs rather than the failure of bond [30] [31] [32]. Use of UHPFRC as a strengthening material is being widelly employed now either as a mix used for replacing the normal concrete fully [26] or partially [23] .…”

Section: Strengthening Techniquesmentioning

confidence: 99%

Numerical Modelling of an Exterior RC Beam Column Joint Subjected to Cyclic Loading Strengthened Using UHPFRC and CFRP

Fayaz¹,

Kaur²,

Bansal³

2022

ASPS Conf. Proc.

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A poorly detailed reinforced concrete (RC) beam-column joint (BCJ) is highly susceptible to damage under seismic forces due to the generation of shear stresses. Shear stresses are generated due to the continuous change in the direction of the compression and tension forces acting on the beam-column joint. As a result, the strength, stiffness and the energy dissipation of the whole structure is affected. It needs to be addressed beforehand by improving its shear, tensile and energy dissipation capacities so that the damage is minimised. So a structure needs to be strengthened prior to any major damage. In the present study the seismic performance assessment of a BCJ strengthened by a combination of ultra-high performance fibre reinforced concrete (UHPFRC) and carbon fibre reinforced polymer (CFRP) has been done analytically in ABAQUS. The seismic parameters observed are the hysteresis response, strength, stiffness, ductility and energy dissipation of the specimens strengthened both by UHPFRC and CFRP. From the results it is clear that the combination of the two strengthening schemes is very efficient in increasing the peak load 2.62 times and the ductility by almost 6% of the specimens as compared to the specimens strengthened using only one scheme. Also the energy dissipation shows an increase of 7.3% in case of using the combination strengthening strategy. The rate of degradation of the strength is also reduced substantially.

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“…These frames should be adequate ductility, strength, energy dissipation and stiffness to resist the seismic loading without collapse [1]. Several studies [2][3][4][5][6][7] have established that SFRC is capable of improving the seismic behavior of reinforced concrete structural members, such as shear walls, beam-column joints, and flexural members subjected to seismic loads. Based on earlier studies, the application of SFRC considerably improve the shear strength [8,9], the flexural strength and ductility [10][11][12] and fracture toughness [13] of the reinforced concrete members.…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance of Steel Fiber Reinforced Concrete Beam-Column Joints under the Variation of Column Axial Load

Yimer¹,

Aure²

2020

IJERT

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This study presents a finite element investigation of steel fiber reinforced concrete beam-column joints under cyclic loading with the variation of axial load. The aim of the study is to investigate the influence of axial load variations on the seismic behavior of steel fiber-reinforced concrete (SFRC) beam-column joints. Nonlinear finite element analysis with a damaged plasticity model in ABAQUS/Standard is adopted. The finite element model is verified using experimental results conducted by other researchers. Six SFRC specimens with different column axial load ratios and a 2% volume fraction of steel fiber were simulated under reversed cyclic loading. The parameters investigated are maximum load-carrying capacity, stiffness degradation, energy dissipation and failure mode. The results indicated that an increase of column axial load has a valuable influence to delay the initiation of cracks and damage accumulation, slightly improvement of the joint stiffness and improves the energy dissipation of joints at the initial stage of loading. Moreover, when the axial load level increases up to 50% of the column capacity, no cracks observed in the joint area and no change in the maximum load-carrying capacity. However, when the axial load level of more than 50% of the column capacity, the cyclic stiffness decreased slightly due to the deterioration caused by crushing of concrete in column. Thus, the results revealed that the increase of column axial load improves the confinement of steel fiber reinforced concrete beam-column joints, however, a threshold limit could be required.

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Enhancement of seismic performance of beam-column joint connections using high performance fiber reinforced cementitious composites

Cited by 63 publications

References 22 publications

Effects of Hybridized Synthetic Fibers on the Shear Properties of Cement Composites

Effects of Hybridized Synthetic Fibers on the Shear Properties of Cement Composites

Numerical Modelling of an Exterior RC Beam Column Joint Subjected to Cyclic Loading Strengthened Using UHPFRC and CFRP

Seismic Performance of Steel Fiber Reinforced Concrete Beam-Column Joints under the Variation of Column Axial Load

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