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Experimental study on bond behavior between high-strength grout and deformed steel bars
Highlights The bond property between high strength grout and steel bar was investigated. Improving grout compressive strength cannot improve the bond strength. Simplified formulas were presented for the characteristic bond-slip values. A constitutive model was proposed to predict the bond-slip curve. FEA models were established to evaluate the constitutive model.
Abstract Engineers use high-strength grout to connect precast concrete members for its low shrinkage and good fluidity. This paper designed 87 central pull-out specimens using the control variable method to investigate the influence of factors on the rebar-grout bond property such as compressive strength, steel grade, bar diameter, transverse stirrups, and bond length. The test result showed that improving grout compressive strength (85.8 MPa–122.7 MPa) cannot improve the bond strength, which was different from the previous conclusions of concrete pull-out tests. Simplified formulas were presented for calculating the characteristic values of bond strength, residual strength, peak slip, and relative slip of load-holding platform based on parameter analysis. Then, a constitutive model was proposed to predict the full-range bond stress-slip curve of high-strength grout and steel bar specimens from bearing to failure. Finally, FEA models were established to evaluate the applicability and accuracy of the constitutive model.
Experimental study on bond behavior between high-strength grout and deformed steel bars
Highlights The bond property between high strength grout and steel bar was investigated. Improving grout compressive strength cannot improve the bond strength. Simplified formulas were presented for the characteristic bond-slip values. A constitutive model was proposed to predict the bond-slip curve. FEA models were established to evaluate the constitutive model.
Abstract Engineers use high-strength grout to connect precast concrete members for its low shrinkage and good fluidity. This paper designed 87 central pull-out specimens using the control variable method to investigate the influence of factors on the rebar-grout bond property such as compressive strength, steel grade, bar diameter, transverse stirrups, and bond length. The test result showed that improving grout compressive strength (85.8 MPa–122.7 MPa) cannot improve the bond strength, which was different from the previous conclusions of concrete pull-out tests. Simplified formulas were presented for calculating the characteristic values of bond strength, residual strength, peak slip, and relative slip of load-holding platform based on parameter analysis. Then, a constitutive model was proposed to predict the full-range bond stress-slip curve of high-strength grout and steel bar specimens from bearing to failure. Finally, FEA models were established to evaluate the applicability and accuracy of the constitutive model.
Experimental study on bond behavior between high-strength grout and deformed steel bars
Yuan, Huang (author) / Bing, Han (author)
2021-06-20
Article (Journal)
Electronic Resource
English
Grout , Bond property , Pull out , Constitutive model , FEA
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