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Behavior of Circular Concrete Columns Repaired with Steel

PDF Behavior of High Strength Concrete Filled Square Steel ...

The concrete filled square steel tubular column with inner CFRP circular tube is composed of a CFRP inner tube, a outer steel tube, and concrete filled in the two tubes, as shown in Figure 1. In order to study the mechanical behavior of high strength concrete filled square steel tubular columns

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Behavior of Concrete Filled Steel Tube Column

1. Dennis Lam, EhabEllobod and Ben Young [2005]: The behavior and design of axially loaded concrete-filled steel tube circular stub columns were presented. The study was carried over a wide range of concrete cube strengths ranging from 30 to 110 MPa. The external diameter of the steel tube-to-thickness (D/t) ratio ranged from 15 to 80.

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Nonlinear Finite-Element Analysis for Hysteretic Behavior ...

The above thin-walled steel columns filled with concrete are referred here to as thin-walled CFT columns. Up to the present, no sufficient and precise research has been conducted on the versatile finite-element model (FE model) analysis that can take into account the upgrading mechanism of thin-walled CFT columns in a direct manner.

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Post-Fire Exposure Behavior of Circular Concrete-filled Steel ...

The thickness of the casing steel was 4 mm and 5 mm and diameter was 100 mm, 125 mm and 150 mm and were infilled with concrete of grade M30 which were used in the present study. This study also represents the behavior of CFST columns for two cooling regimes (annealing and quenching) after exposure to elevated temperatures of 600 °C and 800 °C.

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Behavior of circular concrete-filled double steel tubular ...

The hollow circular steel tubes support the permanent and construction loads of several upper floors during the construction of a high-rise building structure before the concrete is filled into the steel tubes to form circular concrete-filled double steel tubular (CFDST) columns.

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Seismic Behavior of Short Concrete Columns with ...

The seismic behavior of short circular reinforced concrete columns was studied by testing seven columns retrofitted with prestressing steel wire (PSW), subjected to combined constant axial compression and lateral cyclic load. The main test parameters were configuration index of PSW, prestressing level of PSW, and axial compression ratio. An analysis and discussion of the test results including ...

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SEISMIC BEHAVIOR AND ASSESSMENT OF CIRCULAR CONCRETE COLUMNS ...

Four circular columns with diameter of 250mm were tested under combined reversed cyclic lateral force to investigate the seismic behavior of circular concrete columns partially confined by bolted thin steel plates with the aim of developing earthquake-resilient concrete columns. The main experimental

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Experimental Study of Strengthening of RC Columns with ...

This study introduces an experimental program to investigate the performance of concrete wrapping jackets reinforced by steel fibers used for retrofitting of the square and circular RC columns under axial loads. Ten columns divided into two groups; the first group included seven square columns while the second group involved three circular columns.

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Retrofit of Reinforced Concrete Columns - The Ohio State ...

order to counteract this problem, many different retrofit and repair methods have been studied, ... Figure 3.2: Steel jacket retrofit on circular reinforced concrete columns. ... do not need surface treatment to achieve monolithic behavior.

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Sustainable FRP–recycled aggregate concrete–steel composite ...

Nov 01, 2017 · T. Ozbakkaloglu, B.A. Louk Fanggi, J. ZhengConfinement model for concrete in circular and square FRP–concrete–steel double-skin composite columns Mater. Des., 96 (2016), pp. 458-469

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Seismic behavior of circular reinforced concrete bridge ...

Shanmugam, Suriya Prakash, "Seismic behavior of circular reinforced concrete bridge columns under combined loading including torsion" (2009). Doctoral Dissertations. 1998.

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New SMA Confinement Technology for RC Bridge Columns

to enhance the seismic behavior of reinforced concrete (RC) bridge columns. ... Internal transverse steel reinforcement, for new structures, external steel ... applying SMA confinement to non-circular concrete columns and proved its superiority in ... confinement as emergency repair measure for severely damaged concrete ...

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Structural Behaviour of Composite Members with Recycled ...

stub columns under compression are shown in Figure 3. It can be seen that the core concrete of circular columns has good integrity. However, for square columns, core concrete is crushed at the buckling positions of the stainless steel tube. It also confirms the previous observations that the RACFST stub columns containing

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Behavior of heat damaged circular reinforced concrete columns ...

Sep 01, 2020 · This study aims to investigate the behavior of repaired circular reinforced concrete (RC) columns exposed to temperature considering the effect of spacing between CFRP ropes, area of CFRP ropes and degree of temperature. Nine circular column specimens with diameter of 185 mm and length of 800 mm were constructed and tested.

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Behavior of Concrete-Filled Steel Tube Columns Subjected to ...

The behavior of concrete-filled steel tube (CFST) columns subjected to axial compression was experimentally investigated in this paper. Two kinds of columns, including CFST columns with foundation and columns without foundation, were tested. Columns of pure concrete and concrete with reinforcing bars as well as two steel tube thicknesses were considered. The experimental results showed that ...

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Behaviour of circular concrete-filled lean duplex ...

Nov 01, 2013 · In the early stages of loading, the Poisson’s ratio of the concrete core in a circular CFST column is less than that of the steel so that the steel tube does not provide confinement on the concrete core as discussed by Neogi et al. and Johansson and Gylltoft . As the loading increases, the Poisson’s ratio of concrete increases and becomes greater than that of the steel tube.

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Methods of Concrete Column Repair for Cracks and Damages

Methods of Concrete Column Repair for Damages and Cracks Columns may be repaired by using one or more of the following methods: Encasement or enlargement of the column cross section (jacketing). Cathodic protection to stop reinforcing steel corrosion. Re-alkalization of the reinforcing steel to stop corrosion.

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Mechanical Behavior of Circular Steel-Concrete Composite ...

In an experimental and analytical study on the mechanical behavior of circular steel-concrete composite stub columns, 13 specimens were tested. To examine different mechanical behaviors of the columns, three loading conditions were studied.

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BEHAVIOR OF HIGH STRENGTH CONCRETE FILLED SQUARE …

The concrete filled square steel tubular column with inner CFRP circular tube is composed of a CFRP inner tube, a outer steel tube, and concrete filled in the two tubes, as shown in Figure 1. In order to study the mechanical behavior of high strength concrete filled square steel tubular columns

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Behavior of Circular Concrete Columns Repaired with Steel

Repair of fire damaged circular reinforced concrete columns with FRP composites Repair of fire damaged circular reinforced concrete columns with FRP ...

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Strengthening and Repair of Reinforced Concrete Columns by ...

Thus, circular or elliptical FRP jackets were assumed to be more effective. While investigating the behavior of columns with lap splices, Harries et al. [30] found that ...

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"Concrete Column Repair Procedure" by ContractorBhai.com ...

"Concrete Column Repair Procedure" by ContractorBhai.com Get Free Home Renovation Estimate here: http://contractorbhai.com/ --- Our contractor explaining ho...

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Behavior of circular concrete-filled steel tubular columns ...

In order to understand the mechanical behaviors of concrete-filled round-ended steel tubular (CFRT) stub columns, an experimental study on 4 concrete-filled circular steel tubular (CFT) stub ...

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NONLINEAR ANALYSIS OF CONCRETE FILLED STAINLESS …

describe the behavior of circular concrete filled steel tubular column, the pipes been used in that research has the diameter to steel pipe thickness ratio range : (55-200) , and length to diameter ratio equal to 3.5 . H. Hu et al. (2003) made a nonlinear finite element model for concrete filled

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Structural behavior of beam-to-column connections of circular ...

Jun 30, 2015 · Concrete Filled Steel Tube (CFST) is a structure made of a steel tube filled with concrete, in which the rigidity of the member can be increased as the ste The object of this study is a mixed diaphragm which uses a penetrated diaphragm and an exterior diaphragm in combination at beam-tocolumn connections of circular CFST columns to improve the ...

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Investigation of the behavior of circular concrete columns ...

reinforced polymer jackets can be used to reinforce circular concrete columns. ... steel reinforced concrete columns strengthened with FRP ... Repair of earth-.

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Structural Columns & Piers: Inspection for Defects

Watch out: The collapse of a structural steel column is increased if the column is hollow, rather than concrete-filled. Thin-walled Steel Adjustable Teleposts - Maybe Not the Best Choice for Permanent Repairs However what you see in the photographs above is a temporary repair. The rusted steel column should be replaced with a structural column ...

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Shear behavior of large-diameter concrete filled tube (CFT ...

Dec 31, 2017 · Circular concrete filled tube (CFT) is composite structure to fill concrete in steel tube as formwork. By combining advantage of steel tube and concrete, CFT has more superior deformation capacity and strength than reinforced concrete and steel structure, since bond stress between steel tube and concrete has influence on prevention of local buckling and increase in strength of concrete.

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Calculation Example – Reinforced Concrete Column at Stress ...

A rectangular column (400mmX400mm) is constructed of concrete and four steel reinforcing rebars. An axial force of 1000KN is subjected on the column. What is the diameter of the steel bars if the ¼ of the load is transferred to the steel bars and ¾ is transferred to the concrete? ( EST=200GPa, Ec=25GPa) Solution. From the equilibrium of forces:

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(PDF) Stress-Strain Behavior of Circular Concrete Columns ...

This paper presents an experimental program to investigate the axial compressive behavior of circular concrete columns partially wrapped with FRP strips. ... the concrete and the steel in CFST ...

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Cyclic behavior of damaged reinforced concrete columns ...

Apr 01, 2017 · Replacing all visually-observable cracked concrete with HPFRCC improves the cyclic behavior of repaired columns. Under the existing axial load, repairing a damaged column in the plastic hinge zone only (300 mm in height) increased the load capacity and the displacement ductility by 9% and 21%, respectively.

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Full article: Compressive behavior of post-heated circular ...

2017年10月9日 — Keywords: Circular concrete-filled steel tube, short columns, ... the behavior of fire-exposed circular and square CFST columns repaired by ...

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Composite confinement systems for RC column repair and ...

representative stress-strain behavior of confined concrete filled PVC tubes ... jacketed circular bridge columns by Chai [73] on the steel confinement effect on ...

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Nonlinear Finite-Element Analysis for Hysteretic Behavior of ...

Nonlinear Finite-Element Analysis for Hysteretic Behavior of Thin-Walled Circular Steel Columns with In-Filled Concrete. The strength and ductility of thin-walled steel columns under cyclic loads are considerably upgraded by filling concrete into hollow spaces surrounded by steel tube and diaphragms.

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Behavior of circular tubed-RC column to RC beam connections ...

The circular tubed-reinforced concrete (TRC) column is a kind of special concrete-filled steel tube (CFST) columns, in which the outer thin-walled steel tube does not pass through the beam-column joint and thus can avoid the direct transfer of an axial load and maximize the confinement effect from the steel tube.

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