Shear strength of reinforced concrete beam-column joints with crossed inclined bars

Chalioris, Constantin E.; Bantilas, Kosmas E.

doi:10.1016/j.engstruct.2017.02.072

Cited by 37 publications

(11 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The full or even partial replacement of stirrups is crucial in RC joints and deep, torsional, and coupling beams, where design criteria require a high ratio of shear reinforcement that leads to the extremely short spacing of stirrups and/or to the use of cumbersome reinforcement systems such as spirals, cross inclined bars, diagonal reinforcement, etc. [47,48,49,50]. Thus, at least in the critical sections of these shear-vulnerable RC members, the use of steel fibers could lead to reduced reinforcement congestion [19,51,52,53].…”

Section: Introductionmentioning

confidence: 99%

Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams: An Experimental Study

2019

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams: An Experimental Study

2019

View full text Add to dashboard Cite

show abstract

“…As a result, damages incurred by earthquakes are mainly concentrated in the vertical members of the bearing system and particularly in the beam-column connections, which are members with limited dimensions subjected to extreme forces [7]. Hence, the brittle response of the beam-column joints decisively affects the overall seismic performance of the existing RC structures, which show poor and degrading hysteresis behavior and, in many cases, collapse [8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Analytical Model for the Design of HSFC and UHSFC Jackets with Various Steel Fiber Volume Fraction Ratios for the Retrofitting of RC Beam-Column Joints

Tsonos

Kalogeropoulos

2021

Sustainability

View full text Add to dashboard Cite

High-strength steel fiber-reinforced concrete (HSFC) and ultra-high strength steel fiber-reinforced concrete (UHSFC) jackets have been proved experimentally to be much more effective with respect to other strengthening schemes in improving the hysteresis performance of existing substandard reinforced concrete (RC) structural members. In this paper, an existing analytical model for the prediction of the shear capacity of RC beam-column joints strengthened with a HSFC or UHSFC jacket is extended to provide design formulation of these innovative HSFC and UHSFC jackets. An authoritative validation of the proposed formulation is also achieved by comparisons of experimental results of 50 beam-column joint specimens with the analytical predictions of the model. Test data used for verification have been collected from the literature based on experimental studies of the authors and other researchers. The merits of the HSFC and UHSFC jacketing technique are also highlighted in the state of practice. Design and application of the proposed fiber-reinforced concrete jackets in deficient existing RC beam-column joints provides a sustainable strengthening technique by contributing to the reduction in the cost and to labor-intensive procedures of common jackets by completely replacing the installation of reinforcement.

show abstract

“…In previous earthquakes (e.g., the Chi-Chi earthquake in Taiwan (1999), Maule earthquake in Chile (2010), and Pohang earthquake in South Korea (2017)), many researchers have attributed the undesired failures in some RC structures to construction quality defects, including poor quality materials and inadequate reinforcement details [1][2][3]. Typical types of failures due to poor construction practices during earthquake loads include: (i) brittle shear failure of columns and/or beams due to insufficient shear reinforcement [4,5], and (ii) buckling of longitudinal bars or shear failure in beam-column joints due to inadequate spacing or lack of transverse stirrups [6][7][8]. In particular, the Pohang earthquake (M w 5.4) was the most damaging event in South Korea due to the relatively shallow depth (7 km) and the location in the Pohang basin which consists of non-marine to deep marine sedimentary strata.…”

Section: Introductionmentioning

confidence: 99%

Effect of Uncertainties in Material and Structural Detailing on the Seismic Vulnerability of RC Frames Considering Construction Quality Defects

Kim

Moon²,

Kim

2020

Applied Sciences

View full text Add to dashboard Cite

This paper evaluates the effect of construction quality defects on the seismic vulnerability of reinforced concrete (RC) frames. The variability in the construction quality of material properties and structural detailing is considered to assess the effect on the seismic behavior of RC frames. Concrete strength and yield strength of the reinforcement are selected as uncertain variables for the material properties, while the variabilities in the longitudinal reinforcement ratio and the volumetric ratio of transverse reinforcement are employed for structural detailing. Taking into account the selected construction quality uncertainties, the sensitivity analysis of the seismic vulnerability of the RC frames is performed and the impact of significant parameters is assessed at the global and local levels. This extensive analytical study reveals that the seismic vulnerability of the selected RC frame is particularly sensitive to concrete strength and the volumetric ratio of transverse reinforcement.

show abstract

Shear strength of reinforced concrete beam-column joints with crossed inclined bars

Cited by 37 publications

References 19 publications

Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams: An Experimental Study

Cyclic Response of Steel Fiber Reinforced Concrete Slender Beams: An Experimental Study

Analytical Model for the Design of HSFC and UHSFC Jackets with Various Steel Fiber Volume Fraction Ratios for the Retrofitting of RC Beam-Column Joints

Effect of Uncertainties in Material and Structural Detailing on the Seismic Vulnerability of RC Frames Considering Construction Quality Defects

Contact Info

Product

Resources

About