Neutral Axis Depth versus Flexural Ductility in High-Strength Concrete Beams

Bernardo, Luís; Lopes, Sérgio M.R.

doi:10.1061/(asce)0733-9445(2004)130:3(452)

Cited by 90 publications

(57 citation statements)

References 2 publications

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“…The NA moves closer to the top of fiber with the increase in strength. This trend is similar to other reported studies ( Figure 6) for high-strength concrete beams with compressive strengths in the range from 60 to 130 MPa made with other aggregates [9,14,15]. It was noted from analysis that, for the design of flexural members, in high-strength concrete (HSC) the limit on the allowable x max /d suggested in ACI 318 [10] and ECP 203 [11] codes is conservative.…”

Section: Neutral Axis Depthsupporting

confidence: 88%

“…Figure 7 present the graph relationship of the NA depth values defined through parameter x exp /d, with the displacement ductility index, μ d . Its trend seems to show that, as the NA depth at failure increases, the beam's ductility decreases for both dolomite concrete beams and steel slag concrete beams, this agrees with [9,14,15], as shown in Figure 7.…”

Section: Evolution Of the Neutral Axis Depth With Ductilitysupporting

confidence: 76%

“…From the data in Table 8, it is noticed that no big difference between the strains for both RC beams with dolomite and the others with steel slag as a coarse aggregate. The recorded values of strains of steel slag concrete beams (especially, BS1 and BS2) were relatively higher when compared with the other high-strength concrete beams containing traditional coarse aggregate [9,[14][15][16]. The higher steel strains also show that good bond between steel bars and concrete existed till the yielding of steel.…”

Section: Concrete and Steel Strainsmentioning

confidence: 99%

“…Once flexural cracks formed, a change the in slope of the curve was observed, and this slope remained fairly linear until yielding of the steel reinforcement took place. From the moment deflection curves, it can be observed that steel slag concrete beams exhibit behavior nearly similar to that of control beams and other high-strength concrete beams containing traditional coarse aggregate [9,[14][15][16]. The observed experimental midspan deflection under service moment was compared with deflection evaluated from ACI 318 or ECP 203 (both codes are similar) as shown in Table 9.…”

Section: Concrete and Steel Strainsmentioning

confidence: 99%

See 3 more Smart Citations

Flexural Behavior of Reinforced High-Performance Concrete Beams Made with Steel Slag Coarse Aggregate

Zaki

Metwally

El-Betar

2011

ISRN Civil Engineering

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In recent years, an emerging technology termed high-performance concrete (HPC) has become popular in construction industry. The constituent materials of HPC depend on the desired characteristics and the availability of suitable local economic alternatives. One of these alternatives is steel slag waste material. It is an industrial by-product waste particles resulted from reinforcing steel bars manufacture, its production is very huge; total quantity produced from all steel rebars manufacture factories in Egypt is nearly million tons/year. HPC made with steel slag aggregate (SSA) is considered as green concrete, using of steel-slag as a coarse aggregate increases the probability of consuming such large accumulations of slag (in HPC industry) which they represent as a waste and polluted material in environment. A total of eight under, balanced and over reinforced concrete beams were fabricated and tested. RC beams were made with HPC having compressive strength of 58.1 and 75.6 MPa and tensile reinforcement ratio in the range of 0.90 to 4.3%. Data presented concentrated on the chemical, physical, and mechanical properties of the used new material (SSA) and the flexural behavior of reinforced high-performance concrete beams made with steel slag coarse aggregate (RHPC-SSA) beams. It was observed that the RHPC-SSA beams can give satisfactory structural performance according to the American and Egyptian Building Codes.

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Section: Neutral Axis Depthsupporting

confidence: 88%

Section: Evolution Of the Neutral Axis Depth With Ductilitysupporting

confidence: 76%

Section: Concrete and Steel Strainsmentioning

confidence: 99%

Section: Concrete and Steel Strainsmentioning

confidence: 99%

See 2 more Smart Citations

Flexural Behavior of Reinforced High-Performance Concrete Beams Made with Steel Slag Coarse Aggregate

Zaki

Metwally

El-Betar

2011

ISRN Civil Engineering

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“…For each case, the value of the curvature ductility (   ) is computed numerically and the development of the exponents is determined from multiple regression analyses. In order to ensure sufficient ductility, all the structural elements should be correctly reinforced: the detailed rules created for that purpose, especially in codes of practice, should be respected (Bernardo and Lopes 2004). The most commonly used means of guaranteeing adequate ductility is to limit the tensile reinforcement ratio,  .…”

Section: Parametric Studymentioning

confidence: 99%

Curvature Ductility Prediction of Reinforced High‐strength Concrete Beam Sections

Arslan

Cihanli

2010

Journal of Civil Engineering and Management

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Abstract. The ductility of reinforced concrete beams is very important, since it is essential to avoid a brittle failure of the structure by ensuring adequate curvature at the ultimate limit state. One of the procedures used to quantify ductility is based on curvatures, namely, curvature ductility. It is necessary to know the curvature ductility of singly reinforced highstrength concrete (HSC) sections for determining a maximum permissible tensile reinforcement ratio or a maximum depth of the concrete compression area in design codes. The requirements of several codes and methods of prediction of the curvature ductility are based on the experimental results of normal strength concrete (NSC). The rules derived for NSC sections may not be appropriate for HSC sections, and verifications and modifications may be required for the evaluation of curvature ductility of HSC sections. In this study, the major factors affecting the curvature ductility of a singly reinforced HSC beam section are investigated. Based on numerical analyses, a parametric study has been carried out to evaluate the effects of various structural parameters on the curvature ductility of reinforced HSC beam sections.

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Structural Behavior of Reinforced Fibrous Concrete Beams Incorporating Nano Silicon Dioxide Powder

Hama,

Hamadi,

Jahami

2024

Engineering Reports

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This research investigated the combined effect of nano‐silicon dioxide (NSD) and steel fibers (SF) on the structural behavior of reinforced concrete beams. Eight specimens were tested: four without SF and four with SF, with varying NSD percentages (1%, 2%, and 3%) replacing cement. The study examined the mechanical properties of concrete and structural behavior outputs, including load‐deflection, ductility, and damage patterns. Results indicate that NSD significantly enhances compressive strength, with increases of 8.7%, 25.2%, and 32.5% for 1%, 2%, and 3% NSD, respectively. Combined with SF, there are additional improvements in tensile and flexural strengths, leading to higher load capacity and reduced deflection. Beams with 1% steel fibers showed a 30% higher load capacity compared with those without fibers. The ACI code was found to underestimate the load capacity of beams with NSD and SF, indicating the need for updated equations. While NSD increased concrete brittleness, SF enhanced ductility and energy absorption. Future research should focus on optimizing NSD and SF dosages, studying long‐term durability, and validating findings through large‐scale tests.

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Neutral Axis Depth versus Flexural Ductility in High-Strength Concrete Beams

Cited by 90 publications

References 2 publications

Flexural Behavior of Reinforced High-Performance Concrete Beams Made with Steel Slag Coarse Aggregate

Flexural Behavior of Reinforced High-Performance Concrete Beams Made with Steel Slag Coarse Aggregate

Curvature Ductility Prediction of Reinforced High‐strength Concrete Beam Sections

Structural Behavior of Reinforced Fibrous Concrete Beams Incorporating Nano Silicon Dioxide Powder

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