ductility improvement of highstrength concrete columns

Ductility Improvement of High-Strength Concrete Columns ...

High-Strength Concrete 49 load. Such ductility may decrease further with the use of higher strength of concrete. Especially when using the high-strength concrete in high-rise building frames, seismic design of structure may be impossible without enhancement of column ductility. Thus, in this study, eight reinforced concrete columns with lateral ...

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Ductility Improvement of High-Strength Concrete Columns ...

Nov 01, 1990  The concrete compressive strengths were 85.7 and 115.8 MPa, respectively. Volumetric ratio of lateral reinforcement was 1.6 percent in all specimens. Test results indicated that the very large ductility could be achieved by using high yield strength lateral reinforcement, even for such high-strength concrete columns.

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Ductility improvement of high strength concrete columns ...

The usage of high strength concrete (HSC) in reinforced concrete (RC) bridge columns in earthquake prone regions is hindered due to the brittle nature of HSC. Passive lateral confinement does not improve the ductility efficiently since HSC exhibits low lateral expansion under axial loads.

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Ductility Improvement of High-Strength Concrete Columns ...

Jun 01, 2008  The American Concrete Institute. Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete

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Ductility Design of High-Strength Concrete Beams and Columns

Nov 07, 2016  High-strength concrete (HSC) is increasingly used for the construction of tall buildings and long span bridges. However, most engineers just focus on how to better utilize the strength potential of HSC and little attention is paid to ensure that the HSC structures would have sufficient ductility.

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Effectiveness of adding confinement for ductility ...

Mar 01, 2010  The column sections analysed are shown in Fig. 2.To illustrate the effect of stress-path dependence of steel reinforcement at different levels of confining pressure, the column sections having a concrete strength of f co = 70 MPa, longitudinal steel ratio of ρ = 4 % and subjected to an axial load level of P / A g f co = 0.6 were analysed twice, first with the stress-path dependence considered ...

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Ductility improvement of high strength concrete columns ...

The usage of high strength concrete (HSC) in reinforced concrete (RC) bridge columns in earthquake prone regions is hindered due to the brittle nature of HSC. Passive lateral confinement does not improve the ductility efficiently since HSC exhibits low lateral expansion under axial loads.

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4. Improvement of Ductility of High Strength Reinforced ...

Improvement of Ductility of High Strength Reinforced Concrete Elements, High Strength Concrete Effect of Using Different Concrete Strengths for Columns and Beams on The Behaviour of Building Frames Save to Library

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Ductility Design of High-Strength Concrete Beams and Columns

Nov 07, 2016  High-strength concrete (HSC) is increasingly used for the construction of tall buildings and long span bridges. However, most engineers just focus on how to better utilize the strength potential of HSC and little attention is paid to ensure that the HSC structures would have sufficient ductility.

get price

Ductility and Strength in High-Performance Lightweigth ...

− the use of transverse reinforcement configurations B and C resulted in a significant improvement in structural performance (ductility and load-carrying degradation), − the design procedure of EC2 appears to be suitable for predicting the 2nd order effects of high-strength lightweight concrete columns. REFERENCES 1.

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Flexural ductility of high-strength concrete columns with ...

The use of high-strength concrete (HSC) instead of normal-strength concrete (NSC) in columns has the advantage of allowing the column size to be reduced and is thus becoming popular. However, since HSC is more brittle than NSC, its use could result in undesirable brittle failure. To evaluate the ductility of columns, nonlinear moment–curvature analysis taking into account the stress-path ...

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Ductility and stiffness of slender confined reinforced ...

Nov 01, 2019  Ductility and stiffness of slender confined reinforced high-strength concrete columns under monotonic axial load. ... Table 3 also summarises the percentage of the improvement in ductility for different columns relative to their control specimen. Obviously, the confinement exhibited higher gain in ductility for columns with λ = 16. ...

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Strength and Ductility Capacity of High Strength Concrete ...

STRENGTH AND DUCTILITY CAPACITY OF HIGH STRENGTH CONCRETE ELEMENTS Golubka NECEVSKA-CVETANOVSKA1, Roberta PETRUSEVSKA-APOSTOLSKA2 SUMMARY The conceptual consideration of concrete has been changed lately. It becomes clear that even minor changes in its composition lead to a considerable improvement of its characteristics. For

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Critical factors in displacement ductility assessment of ...

Sep 25, 2017  Ductility of high-strength concrete (HSC) columns with rectangular sections was assessed in this study by reviewing experimental data from the available literature. Up to 112 normal weights concrete columns with strength in the range of 50–130 MPa were considered and presented as a database. The data included the results of column testes under axial and reversed lateral loading.

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Flexural ductility design of confined high-strength ...

Jan 01, 2016  Analysis was performed on standard circular column with diameter, D = 150 mm (Fig. 1a). Four 10 mm diameter longitudinal steel bars are evenly distributed around the section.Concrete cover of 20 mm is assumed and the concrete grade is 60, indicating that f cu = 60 MPa. The longitudinal steel bar is assumed to have f y = 460 MPa and E s = 200 GPa.

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Confining reinforcement for high strength concrete columns

HINGE REGIONS OF HSC COLUMNS While improvement in the strength and ductility of reinforced concrete columns as a result of transverse reinforcement have been confirmed by many investigators, the amount of confining steel required in the form of circular or rectangular transverse reinforcement is still the subject of controversy.

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DUCTILITY REQUIREMENTS FOR BUILDINGS

Ductility can be defined as the “ability of material to undergo large deformations without rupture before failure”. Ductility in concrete is defined by the percentage of steel reinforcement with in it. Mild steel is an example of a ductile material that can be bent and twisted without rupture.

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The behavior of ultra-high-strength reinforced concrete ...

Dec 01, 2016  The fiber reinforced ultra high strength concrete failed in a more ductile mode. The addition of fibers transformed the brittle high strength cement composite into a more isotropic, ductile material and thus increase in the member ductility was observed. Failure mode of the tested specimens C1, C4, and C5 were shown in Fig. 10. It was observed ...

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Ductility of High-Strength Concrete Columns with High ...

Jun 01, 2001  Abstract. The objective of this experimental study is to find the allowable level of axial load to give the proper flexural ductility according to the yield strength of lateral ties, and the distribution and amount of longitudinal bars used in confined high-strength concrete columns.

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Improving flexural ductility of high-strength concrete beams

With the advent of advanced mineral and chemical admixtures, the strength level of concrete has been raised dramatically and high-strength concrete (HSC) is becoming more and more commonly used. However, HSC is generally more brittle than normal strength concrete. In fact, it has been shown that the use of HSC, if not properly controlled, could significantly reduce the flexural ductility of ...

get price

4. Improvement of Ductility of High Strength Reinforced ...

Improvement of Ductility of High Strength Reinforced Concrete Elements, High Strength Concrete Effect of Using Different Concrete Strengths for Columns and Beams on The Behaviour of Building Frames Save to Library

get price

Ductility of High-Strength Concrete Columns with High ...

Jun 01, 2001  Abstract. The objective of this experimental study is to find the allowable level of axial load to give the proper flexural ductility according to the yield strength of lateral ties, and the distribution and amount of longitudinal bars used in confined high-strength concrete columns.

get price

Flexural ductility of high-strength concrete columns with ...

Sep 25, 2008  The use of high-strength concrete (HSC) instead of normal-strength concrete (NSC) in columns has the advantage of allowing the column size to be reduced and is thus becoming popular. However, since HSC is more brittle than NSC, its use could result in undesirable brittle failure. To evaluate the ductility of columns, nonlinear moment–curvature analysis taking into account the

get price

Ductility and Strength in High-Performance Lightweigth ...

− the use of transverse reinforcement configurations B and C resulted in a significant improvement in structural performance (ductility and load-carrying degradation), − the design procedure of EC2 appears to be suitable for predicting the 2nd order effects of high-strength lightweight concrete columns. REFERENCES 1.

get price

Ductility and stiffness of slender confined reinforced ...

Nov 01, 2019  Ductility and stiffness of slender confined reinforced high-strength concrete columns under monotonic axial load. ... Table 3 also summarises the percentage of the improvement in ductility for different columns relative to their control specimen. Obviously, the confinement exhibited higher gain in ductility for columns with λ = 16. ...

get price

Improving flexural ductility of high-strength concrete beams

With the advent of advanced mineral and chemical admixtures, the strength level of concrete has been raised dramatically and high-strength concrete (HSC) is becoming more and more commonly used. However, HSC is generally more brittle than normal strength concrete. In fact, it has been shown that the use of HSC, if not properly controlled, could significantly reduce the flexural ductility of ...

get price

Strength and Ductility Capacity of High Strength Concrete ...

STRENGTH AND DUCTILITY CAPACITY OF HIGH STRENGTH CONCRETE ELEMENTS Golubka NECEVSKA-CVETANOVSKA1, Roberta PETRUSEVSKA-APOSTOLSKA2 SUMMARY The conceptual consideration of concrete has been changed lately. It becomes clear that even minor changes in its composition lead to a considerable improvement of its characteristics. For

get price

Ductility enhancement of geopolymer concrete columns

in geopolymer concrete, this paper outlines a research program to investigate the ductility enhancement of the material using FRP wrapping. It identifies the improvement of strength and ductility by the use of FRP wrapping in geopolymer concrete. Experimental program An experimental program was designed to prepare geopolymer concrete short column

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Confining reinforcement for high strength concrete columns

HINGE REGIONS OF HSC COLUMNS While improvement in the strength and ductility of reinforced concrete columns as a result of transverse reinforcement have been confirmed by many investigators, the amount of confining steel required in the form of circular or rectangular transverse reinforcement is still the subject of controversy.

get price

DUCTILITY REQUIREMENTS FOR BUILDINGS

Ductility can be defined as the “ability of material to undergo large deformations without rupture before failure”. Ductility in concrete is defined by the percentage of steel reinforcement with in it. Mild steel is an example of a ductile material that can be bent and twisted without rupture.

get price

The behavior of ultra-high-strength reinforced concrete ...

Dec 01, 2016  The fiber reinforced ultra high strength concrete failed in a more ductile mode. The addition of fibers transformed the brittle high strength cement composite into a more isotropic, ductile material and thus increase in the member ductility was observed. Failure mode of the tested specimens C1, C4, and C5 were shown in Fig. 10. It was observed ...

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Confining Reinforcement for High-Strength Concrete Columns

columns by Li, Park, and Tanaka3 have confirmed that satis- factory ductile behavior is not achieved in the plastic hinge INTRODUCTION regions of HSC column units with confining reinforcement The increasing use of high-strength concrete (HSC) in designed according to the NZS 31011 and ACI 318.2 There construction in North America, Japan, and ...

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Figure 4 from STRENGTH AND DUCTILITY ENHANCEMENT OF ...

corpus id: 139766187. strength and ductility enhancement of reinforced hsc columns confined with high-strength transverse steel @inproceedings{tavio2011strengthad, title={strength and ductility enhancement of reinforced hsc columns confined with high-strength

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[PDF] High-Strength Concrete Columns : State of the Art ...

Corpus ID: 26631299. High-Strength Concrete Columns : State of the Art Reported by joint ACI-ASCECommittee 441 @inproceedings{Mirza1998HighStrengthCC, title={High-Strength Concrete Columns : State of the Art Reported by joint ACI-ASCECommittee 441}, author={S. A. Mirza and A. Azizinamini and Perry Adebar and Secretary and A. Elwi and D. D. Lee and B. Rangan and R.

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