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external reinforcement of high strength concrete columns

external reinforcement of high strength concrete columns

External reinforcement of high strength concrete columns ...

Sep 01, 2004  This paper experimentally investigates a number of high strength concrete columns that are externally reinforced with galvanised steel straps and fibre-reinforced polymers subjected to concentric and eccentric loading. The experimental results show that external reinforcement can enhance the properties of high strength concrete columns.

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External reinforcement of high strength concrete columns ...

The experimental results show that external reinforcement can enhance the properties of high strength concrete columns. Introduction Since high strength concrete has become a familiar phase in concrete technology in the late 1980s, the application of high strength concrete in the construction industry has steadily increased over the past two ...

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External reinforcement of high strength concrete columns ...

Hadi and Li (2004) proved that the external wrapping approach using fiber-reinforced polymers offers the benefits of confinement to enhance the ductility of high-strength concrete columns. Overall ...

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High-Strength Reinforcement in Exterior Beam-Column Joints ...

Sep 01, 2017  Keywords: beam-column joint; confinement; cyclic testing; headed reinforcement; high-strength steel; shear strength. Date: 9/1/2017. Abstract: This paper presents cyclic responses of five exterior beam-column joints made with 100 ksi (690 MPa) longitudinal bars, 115 ksi (790 MPa) transverse reinforcement, and 10 ksi (70 MPa) concrete.

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High-strength concrete exterior beam-column joints with ...

Aug 15, 2017  1. Introduction. Most studies on the behavior of reinforced concrete (RC) beam-column joints focused on the test specimens designed with normal-strength steel reinforcements with yield strength of up to 420 MPa.In recent years, the use of high-yield strength reinforcing rebars has been introduced to the construction industry sparking extensive research in this area.

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PERFORMANCE OF EXTERNAL REINFORCED CONCRETE BEAM

KEYWORDS: joints, beam-column-connection, shear strength, high strength, concrete, joint reinforcement, R. C. frames. 1- INTRODUCTION There is no doubt, that beam-column joints in R.C. ductile frames require special attention. Unless the designer possesses a good understanding of joint behavior and the

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Study of High Strength Reinforced Concrete Exterior Beam ...

Study of High Strength Reinforced Concrete Exterior Beam-Column Joints under Cyclic Loading A.M Alkhatib1, M. A. Al-Osta1, M.H. Baluch1, and M.K. Rahman2 1King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia 2CER, Research Institute, King Fahd Univ. of Petroleum Minerals, Saudi Arabia ABSTRACT: This study investigates experimentally the behavior of full scale, shear

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Lateral Reinforcement For High-Strength Concrete Columns

The equatians given in the code are based on the assumption that when a reinforced concrete column is subjected to uniaxial load the maximum capacity of the confined core is reached when the unconfined cover starts spalling. It is not clear whether this assumption is applicable for high strength concrete.

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Experimental study of HSS-reinforced exterior beam–column ...

High-strength steel (HSS) bars are used as beam and column longitudinal reinforcements to reduce the amount of bars and thereby, prevent reinforcement congestion and insufficient concrete compaction.

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Behavior of high strength concrete columns under eccentric ...

Apr 01, 2015  Introduction. In recent years, high strength concrete columns have been widely used in many structures, especially, in high-rise buildings. ACI Committee 363 defined high strength concrete as a concrete strength of 41 MPa. More recently, compressive strengths approaching 138 MPa have been used in cast-in-place buildings.Concrete compressive strength higher than 65 MPa is referred to as high ...

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"External Reinforcement of Concrete Columns" by Muhammad

The experimental results show that external reinforcement can enhance the properties of high strength concrete columns. With the technology development on the compressive strength of concrete over the years, the use of high strength concrete has proved most popular in terms of economy, superior strength, stiffness and durability due to many ...

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"External reinforcement of concrete columns" by Muhammad N ...

The experimental results show that external reinforcement can enhance the properties of high strength concrete columns. With the technology development on the compressive strength of concrete over the years, the use of high strength concrete has proved most popular in terms of economy, superior strength, stiffness and durability due to many ...

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Study of High Strength Reinforced Concrete Exterior Beam ...

Study of High Strength Reinforced Concrete Exterior Beam-Column Joints under Cyclic Loading A.M Alkhatib1, M. A. Al-Osta1, M.H. Baluch1, and M.K. Rahman2 1King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia 2CER, Research Institute, King Fahd Univ. of Petroleum Minerals, Saudi Arabia ABSTRACT: This study investigates experimentally the behavior of full scale, shear

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Reinforcing High-rise Concrete Walls And Columns With ...

Reinforcing High-rise Concrete Walls And Columns With Carbon Fiber Sheets. External bonded carbon fiber sheet reinforcement. For walls and columns with concrete strength grades of about C32, wrap carbon fiber sheet is used to improve the compressive strength to meet the design requirements.

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Lateral Reinforcement For High-Strength Concrete Columns

The equatians given in the code are based on the assumption that when a reinforced concrete column is subjected to uniaxial load the maximum capacity of the confined core is reached when the unconfined cover starts spalling. It is not clear whether this assumption is applicable for high strength concrete.

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Strength and Ductility of Concrete Columns Externally ...

technique requires wrapping thin, flexible high-strength fiber composite straps around the column to improve the confinement and, thereby, its duc-tility and strength. Analytical models are presented that quantify the gain in strength and ductility of concrete columns externally confined by means of high-strength fiber composite straps.

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Spirally Reinforced High-Strength Concrete Columns

Based on these test results, implications concerning use of high-strength concrete in spirally reinforced columns are discussed. It is shown that present design specifications, based on tests of columns using lower-strength concrete, may be unsafe under some conditions if extended to columns using high-strength concrete.

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(PDF) Lateral reinforcement requirement in high-strength ...

It has been demonstrated that high-strength concrete (HSC) is able to improve the strength-to-weight ratio of reinforced concrete columns and maximise the usable areas of tall buildings.

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Structural Behavior of Strengthened RC Columns Using High ...

applied to the column by means of an external jacketing, especially when the compressive strength of the existing column is very low or the internal steel reinforcement is damaged by corrosion. The

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High-Strength Concrete Columns With Longitudinal ...

Oct 01, 1994  In recent years, moment-resisting frames built using high-strength concrete have been used for high-rise buildings, primarily for economic reasons. When such high-rise buildings are subjected to severe earthquakes, cyclic horizontal and axial loading can be imposed on the exterior columns. The ductile behavior of such columns needs to be insured.

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PERFORMANCE ANALYSIS OF TUBED STEEL REINFORCED

Abstract - Tubed steel reinforced high strength concrete (TSRC) column is a special type of column. It consists of an internal steel section, infilled concrete and an external steel tube. The steel tube is disconnected at the beam-column joint. Entire model works as a hoop confinement to minimize the possibility of local buckling of the column.

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Behaviour of fibre-reinforced high-performance concrete in ...

high performance concrete (HPC) in exterior beam-column joint with and without fibre under monotonic loading. In this experimental investigation, cross-diagonal bars have been provided at the joint for reducing the congestion of reinforcement in joints, and also M75 grade of concrete with optimum mix proportion of 10 % silica fume and 0.3 % ...

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Seismic Design and Detailing of Exterior Reinforced ...

Six exterior reinforced concrete beam-column connections using concrete with design compressive strength of 70 and 28 MPa and Grade 60 steel were constructed and tested [7,8]. A typical beam-column subassemblage tested in this study is shown in Fig. 2. Sufficient shear reinforcement was

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Advanced Composite Retrofit of RC Columns and Frames with ...

2 天前  This study develops three-dimensional (3D) finite element (FE) models of composite retrofits in deficient reinforced concrete (RC) columns and frames. The aim is to investigate critical cases of RC columns with inadequate lap splices of bars or corroded steel reinforcements and the beneficial effects of external FRP jacketing to avoid their premature failure and structural collapse.

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"External Reinforcement of Concrete Columns" by Muhammad

The experimental results show that external reinforcement can enhance the properties of high strength concrete columns. With the technology development on the compressive strength of concrete over the years, the use of high strength concrete has proved most popular in terms of economy, superior strength, stiffness and durability due to many ...

get price

"External reinforcement of concrete columns" by Muhammad N ...

The experimental results show that external reinforcement can enhance the properties of high strength concrete columns. With the technology development on the compressive strength of concrete over the years, the use of high strength concrete has proved most popular in terms of economy, superior strength, stiffness and durability due to many ...

get price

EXTERNAL STRENGTHENING OF REINFORCED CONCRETE

EXTERNAL STRENGTHENING OF REINFORCED CONCRETE COLUMN WITH CFRP Ratish Y Chengala1, D. Vigneshkumar2, ... Low compressive strength of the column member will lead to reduction in bearing capacity ... development in high performance resign systems and new style of reinforcement, such as carbon nano tubes ...

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Spirally Reinforced High-Strength Concrete Columns

Based on these test results, implications concerning use of high-strength concrete in spirally reinforced columns are discussed. It is shown that present design specifications, based on tests of columns using lower-strength concrete, may be unsafe under some conditions if extended to columns using high-strength concrete.

get price

Experimental study of HSS-reinforced exterior beam–column ...

High-strength steel (HSS) bars are used as beam and column longitudinal reinforcements to reduce the amount of bars and thereby, prevent reinforcement congestion and insufficient concrete compaction.

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PERFORMANCE ANALYSIS OF TUBED STEEL REINFORCED

Abstract - Tubed steel reinforced high strength concrete (TSRC) column is a special type of column. It consists of an internal steel section, infilled concrete and an external steel tube. The steel tube is disconnected at the beam-column joint. Entire model works as a hoop confinement to minimize the possibility of local buckling of the column.

get price

Seismic response evaluation of reinforced high strength ...

reinforced High-Strength Concrete (HSC) columns. We have studied the nonlinear response of HSC columns with various reinforcement and axial force ratios subjected to cyclic loading. The study consists of primary veri cation of mathematical nonlinear model and further calibration to ensure the required accuracy. The existing experimental work is

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(PDF) Strength and Ductility of Concrete Columns ...

In this paper, a new tech-nique for seismic strengthening of concrete columns is presented. The technique requires wrapping thin, flexible high-strength fiber composite straps around the column to ...

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STEEL FIBRE REINFORCED HIGH PERFORMANCE CONCRETE

In the present investigation, ten exterior beam-column joints were cast and tested under flexural cyclic loading. The overall dimensions and the details of the reinforcement of the beam-column joints are given in Figure 1. The column was reinforced with four 12 mm diameter high yield strength deformed

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Design Examples for High Strength Steel Reinforced ...

Jun 30, 2021  This book is the companion volume to Design of High Strength Steel Reinforced Concrete Columns – A Eurocode 4 Approach. This book provides a large number of worked examples for the design of high strength steel reinforced concrete (SRC) columns. It is based on the Eurocode 4 approach, but goes beyond this to give much needed guidance on the narrower range of permitted concrete

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Experimental investigation of full-scale concrete columns ...

Oct 01, 2020  The use of high-strength longitudinal and transverse reinforcements in confined concrete columns can improve bearing capacity and deformability. Besides, experiments on confined concrete columns with side length of 400 mm can better reflect the behaviour of confined concrete columns in engineering project. Thus, the purpose of this study is to investigate the seismic

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Structural performance of reinforced concrete interior ...

Jun 02, 2021  This study evaluates the structural performance of reinforced concrete interior beam–column joints having high-strength screw-type steel bars mechanically connected with couplers. A total of six full-scale specimens were cast and subjected to repeated cyclic lateral loads. High-strength screw-type reinforcing bars, with a yield strength of 690 MPa, were used as longitudinal reinforcement

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Advanced Composite Retrofit of RC Columns and Frames with ...

2 天前  This study develops three-dimensional (3D) finite element (FE) models of composite retrofits in deficient reinforced concrete (RC) columns and frames. The aim is to investigate critical cases of RC columns with inadequate lap splices of bars or corroded steel reinforcements and the beneficial effects of external FRP jacketing to avoid their premature failure and structural collapse.

get price

Seismic Behavior of Exterior Beam-Column ... - Concrete

Jul 01, 2019  The beam-column connections using high-strength steel and concrete exhibited satisfactory performance and withstood very large lateral drifts. Test results also demonstrated that the addition of steel fibers in a 1% volume fraction effectively allowed for a 30% reduction in column/ joint confining reinforcement.

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