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ductility improvement of highstrength concrete columns

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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STRENGTH AND DUCTILITY OF HIGH-STRENGTH CONCRETE

1 STRENGTH AND DUCTILITY OF HIGH-STRENGTH CONCRETE COLUMNS REINFORCED WITH HIGH-STRENGTH STEEL Mohsen K. Khalajestani 1, Ahsan Parvez , Stephen J. Foster 1, Hamid Valipour and Graeme McGregor2 1School of Civil and Environmental Engineering, UNSW Sydney, Australia 2Liberty Steel, Australia Abstract: The demand for high-strength reinforcing materials has

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Effectiveness of adding confinement for ductility ...

The use of high-strength concrete (HSC) can reduce the size of columns in tall buildings and save space. However, this will also reduce the flexural ductility of the 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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STRENGTH AND DUCTILITY OF HIGH-STRENGTH

1 STRENGTH AND DUCTILITY OF HIGH-STRENGTH CONCRETE COLUMNS REINFORCED WITH HIGH-STRENGTH STEEL Mohsen K. Khalajestani 1, Ahsan Parvez , Stephen J. Foster 1, Hamid Valipour and Graeme McGregor2 1School of Civil and Environmental Engineering, UNSW Sydney, Australia 2Liberty Steel, Australia Abstract: The demand for high-strength reinforcing materials has

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Ductility Enhancement of High Strength Concrete Columns ...

In recent years, the demand of high strength concrete has increased in the construction industry. The acceptance of high strength concrete in related industry is due to several reasons, which ...

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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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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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Design of High-Strength Concrete Columns for Strength and ...

May 22, 2003  While column ductility can be increased through confinement, the ACI 318-02 (1) confinement requirements are intended for normal-strength concrete columns and are not applicable to columns cast from high-strength concrete. A displacement based design procedure has been developed for the confinement of high-strength concrete columns.

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Critical factors in displacement ductility assessment of ...

Sep 25, 2017  Muguruma H, Watanabe F, Komuro T (1990) Ductility improvement of high strength concrete columns with lateral confinement. ACI Spec Publ 121:47–60. Google Scholar Mugurumu H (1991) Ductile behaviours of high strength concrete columns confined by high strength transverse reinforcement. ACI Spec Publ 128:877–892

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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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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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Numerical Investigation of High-Strength Steel and ...

Jul 07, 2021  Ultrahigh-performance concrete (UHPC) has the potential to address seismic performance issues reported for rectangular hollow columns. However, an impediment to the use of UHPC is its limited flexural ductility compared with normal concrete (NC) with the same confinement.

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(PDF) Retrofitting of reinforced concrete columns using ...

RC columns, respectively. In traditional reinforced concrete jacketing, the section of the column is enlarged by casting a new reinforced concrete/mortar section over a part or the entire length of the column. The new section is bonded to the original section through anchor rebars or high-strength bolts.

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Experimental Investigation on the Ductility of Concrete ...

Jul 22, 2021  Using steel bars in corrosive conditions imposes a high cost on concrete elements. This is due to corrosion of steel bars. In order to eliminate this issue, the use of composite materials in civil engineering practices has become an area of focus because of their acceptable mechanical behavior, such as high strength, suitable durability in corrosive environmental conditions, and low weight.

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

In 2018, the. strength of steel for bar reinforcement was further increased to an upper limit of 600 MPa generally. and 800 MPa steel for ties in high-strength concrete (HSC) columns. In the case ...

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Ductility Design of High-Strength Concrete Beams and Columns

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 ...

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

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 ...

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. ...

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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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Flexural Strength and Ductility of High-Strength Concrete ...

Oct 01, 1998  Date: 10/1/1998. Abstract: High strength concrete with a specified compressive cylinder strength fi of up to 70 MPa for ductile elements in seismic design and of up to 100 MPa for other elements is now permitted by the recently revised New Zealand concrete design standard NZS 3101:1995. Also, longitudinal reinforcement with a characteristic ...

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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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Strengthening of reinforced concrete long circular columns

[Show full abstract] columns made from high strength concrete (HSC) were cast and tested. Six of the columns had a circular cross section (two solid columns, two hollow columns each having a ...

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Axial-moment interaction of high strength concrete encased ...

Dec 01, 2020  1. Introduction. In top down construction of high-rise buildings, concrete encased steel (CES) columns are preferred due to their excellent load-carrying capacity and fire resistance [].Most of the modern design codes such as EN 1994-1-1 [], AISC 360–16 [] and JGJ 138–2016 [] only permit the usage of normal strength materials in CES columns.The restricted use of high strength materials for ...

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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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Strength and ductility of external steel collared concrete ...

new retrofitting method. The results have shown significant improvement in both strength and ductility of square concrete column confined externally by L-shaped steel collars. Keywords: compressive strength, ductility, external confinement, retrofit, square concrete columns, steel collars. 1. Introduction . Concrete . under compression suffers ...

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HKU Scholars Hub: Improving flexural ductility of high ...

High-strength concrete (HSC) has been widely used in the column construction of tall buildings because of its larger strength-to-weight ratio. The current design of HSC columns focuses on providing adequate flexural strength but not on flexural ductility.

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