Effect of steel–FRP ratio and FRP wrapping layers on tensile properties of glass FRP-wrapped ribbed steel reinforcing bars

This paper presents some experimental results of tensile properties of reinforcing bars spliced by grout-filled coupling sleeves after exposed to fires to identify the effect of temperature histories on tensile properties of spliced reinforcing bars, which provide a useful base for assessing structural behaviors of precast reinforced concrete buildings damaged by fires. A spliced rebar system investigated in this paper consists of two equal-diameter steel reinforcing bars with 25mm diameter and a straight coupling sleeve with 55mm outer and 42mm inner diameters. As a result, the thickness of grout between internal steel bars and outer sleeves are 8.5mm. Five test specimens are manufactured in identical technology and divided into three groups. First group is reference group consist of just one specimen which is not exposed to fire. Second and third groups consist of two specimens that are exposed to ISO 834 standard fire in furnace for 15 and 25 minutes respectively. The temperature-time curves of grout between rebars and sleeves are measured via thermocouples embedded in grout. Subsequently, a universal testing machine is used to test the ultimate load bearing capacities of five specimens. Test results demonstrate that ultimate load bearing capacities of steel rebars spliced by grout-filled sleeves are considerably reduced due to fire damaged grout.

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Response of lap splice of reinforcing bars confined by FRP wrapping: modeling approach

STRUCTURAL ENGINEERING AND MECHANICS ◽

10.12989/sem.2011.37.1.095 ◽

2011 ◽

Vol 37 (1) ◽

pp. 95-110 ◽

Cited By ~ 4

Author(s):

Dam Xuan Thai ◽

Amorn Pimanmas

Keyword(s):

Reinforcing Bars ◽

Lap Splice ◽

Modeling Approach ◽

Frp Wrapping

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Numerical Analysis on Tensile Properties of Grout-filled Splice Sleeve Rebars under ISO 834 Standard Fire

E3S Web of Conferences ◽

10.1051/e3sconf/20183803036 ◽

2018 ◽

Vol 38 ◽

pp. 03036 ◽

Cited By ~ 1

Author(s):

Yong Jun Liu ◽

Chao Li ◽

When Jun Zhou

Keyword(s):

Tensile Properties ◽

Fire Resistance ◽

Tensile Load ◽

Load Ratio ◽

Reinforcing Bars ◽

Element Analysis ◽

Standard Fire ◽

Axial Tensile ◽

Stress Changes ◽

Steel Bars

This paper presents some numerical simulation results of tensile properties of reinforcing bars spliced by grout-filled coupling sleeves under fire conditions to identify the effect of load ratio on fire resistance time of spliced reinforcing bars, which provide a useful base for predicting structural behaviors of pre-cast reinforced concrete buildings in fires. A spliced rebar system investigated in this paper consists of two equal-diameter steel reinforcing bars with 25mm diameter and a straight coupling sleeve with 50mm outer and 45mm inner diameters. As a result, the thickness of grout between steel bars and sleeves are 20mm. Firstly, the temperature distributions in steel bars connected by grout- filled coupling sleeves exposed to ISO 834 standard fire were calculated utilizing finite element analysis software ANSYS. Secondly, the stress changes in heated steel bars connected by grout-filled coupling sleeves under different constant tensile loads were calculated step by step until the rebar system failed due to fire. Thus, the fire resistant time of rebar spliced by grout-filled coupling sleeves under different axial tensile loads can be determined, further, the relationship between fire resistance time and axial tensile loads ratio can could be obtained. Finally, the fire resistant times versus axial tensile load ratios curve of grout-filled splice sleeve rebars exposed to ISO 834 standard fire is presented.

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USS BEN-WELD

Alloy Digest ◽

10.31399/asm.ad.sa0295 ◽

1973 ◽

Vol 22 (10) ◽

Keyword(s):

United States ◽

Mechanical Properties ◽

Physical Properties ◽

Surface Treatment ◽

Tensile Properties ◽

Lower Cost ◽

Large Diameter ◽

Heat Treating ◽

Reinforcing Bars ◽

United States Steel Corporation

Abstract USS BEN-WELD is an alloy steel that fills the designer's need for large-diameter, ductile reinforcing bars with specified minimum mechanical properties. Compared to many other steels for reinforcing bars, USS BEN-WELD provides simplified, lower cost welding and more compact designs through more acute bending. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on forming, heat treating, machining, joining, and surface treatment. Filing Code: SA-295. Producer or source: United States Steel Corporation.

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