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Experimental study on bond performance between rebar and grout and confinement effects of grouted sleeve connections
Highlights The distribution of confinement stress along bond length was discussed. The influence of critical parameters on bond property was investigated. The confinement stress of steel sleeve and ductile iron sleeve was investigated. Unified formulas were proposed for calculating the bond strength confinement stress.
Abstract In this paper, 84 steel sleeve and ductile iron sleeve connection specimens were tested. The influence of critical parameters on the confinement mechanism of sleeve, and the bond performance between rebar and grout under confinement effect was studied. The following parameters were considered in the experiments: compressive strength of grout, bond length, rebar diameter, rebar yield strength, and grout thickness. Pull-out tests were performed to obtain the complete bond-slip curves. Transverse and longitudinal strains were measured to determine the distribution of confinement stress along the bond length. The following findings were observed during testing: (i) the confinement stress was not uniformly distributed along the bond length; (ii) the bond length, rebar diameter, rebar yield strength, and elastic modulus of the sleeve wall had significant effect on the confinement stress; (iii) the confinement stress, grout compressive strength, bond length, rebar diameter, and rebar yield strength had significant effect on the bond strength. At the end of this study, simplified formulas of predicting the average confinement stress, the bond strength, and the peak slip in grouted sleeves were presented.
Experimental study on bond performance between rebar and grout and confinement effects of grouted sleeve connections
Highlights The distribution of confinement stress along bond length was discussed. The influence of critical parameters on bond property was investigated. The confinement stress of steel sleeve and ductile iron sleeve was investigated. Unified formulas were proposed for calculating the bond strength confinement stress.
Abstract In this paper, 84 steel sleeve and ductile iron sleeve connection specimens were tested. The influence of critical parameters on the confinement mechanism of sleeve, and the bond performance between rebar and grout under confinement effect was studied. The following parameters were considered in the experiments: compressive strength of grout, bond length, rebar diameter, rebar yield strength, and grout thickness. Pull-out tests were performed to obtain the complete bond-slip curves. Transverse and longitudinal strains were measured to determine the distribution of confinement stress along the bond length. The following findings were observed during testing: (i) the confinement stress was not uniformly distributed along the bond length; (ii) the bond length, rebar diameter, rebar yield strength, and elastic modulus of the sleeve wall had significant effect on the confinement stress; (iii) the confinement stress, grout compressive strength, bond length, rebar diameter, and rebar yield strength had significant effect on the bond strength. At the end of this study, simplified formulas of predicting the average confinement stress, the bond strength, and the peak slip in grouted sleeves were presented.
Experimental study on bond performance between rebar and grout and confinement effects of grouted sleeve connections
Bing, Han (author) / Yuan, Huang (author)
2022-09-05
Article (Journal)
Electronic Resource
English
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