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Fracture and damage properties of high-strength concrete under cyclic loading
Highlights Three-point bending tests were performed on single-edged notched high-strength concrete beams (HSC) under cyclic loading. Digital image correlation (DIC) technique was used to measure the full-field displacement of HSC beams during the entire loading process. Under cyclic loading, the degree of load degradation was quantitatively reflected by defining a parameter called load reduction rate. By observing the variation of the load versus crack mouth opening displacement curves of HSC beams under cyclic loading, four parameters were defined to quantitatively describe the variation of the stiffness and damage. By observing the variation of the damage zone measured by DIC technique, a damage index was defined and used to quantitatively describe the damage.
Abstract To study the fracture and damage characteristics of high-strength concrete (HSC), three-point bending (TPB) tests were performed on single-edged notched beams under cyclic loading, and digital image correlation (DIC) technique was used to measure the surface deformation of the beams. First, the crack mouth opening displacement (CMOD) measured by the DIC was compared with that obtained by clip gauge to verify the reliability of the DIC technique in measuring the surface deformation of materials. Then, the relationships between the load and displacements were studied; Finally, the impact of loading history on the CMOD, crack length (L c), stiffness (S), dissipated energy, fracture energy (G F), strain concentration zone (SCZ) and damage zone were investigated. The experimental results indicated that the bearing capacity, deformation performance and the G F of HSC were not affected by the loading and unloading process; under cyclic loading, as the dimensionless crack mouth opening at the unloading point (CMODduni) increases, the dimensionless residual crack mouth opening (CMODdri) gradually increases while the load degradation rate (φ) gradually decreases; in the i th cycle of the post-peak stage, the crack opening rate was greater than the crack growth rate when the beam was loaded to the peak point from the reloading point. To quantify the damage degree of the single-edged notched beam, damage index (D) was calculated, which is more suitable obtained from the damage zone-based method than that calculated from the P-CMOD curve.
Fracture and damage properties of high-strength concrete under cyclic loading
Highlights Three-point bending tests were performed on single-edged notched high-strength concrete beams (HSC) under cyclic loading. Digital image correlation (DIC) technique was used to measure the full-field displacement of HSC beams during the entire loading process. Under cyclic loading, the degree of load degradation was quantitatively reflected by defining a parameter called load reduction rate. By observing the variation of the load versus crack mouth opening displacement curves of HSC beams under cyclic loading, four parameters were defined to quantitatively describe the variation of the stiffness and damage. By observing the variation of the damage zone measured by DIC technique, a damage index was defined and used to quantitatively describe the damage.
Abstract To study the fracture and damage characteristics of high-strength concrete (HSC), three-point bending (TPB) tests were performed on single-edged notched beams under cyclic loading, and digital image correlation (DIC) technique was used to measure the surface deformation of the beams. First, the crack mouth opening displacement (CMOD) measured by the DIC was compared with that obtained by clip gauge to verify the reliability of the DIC technique in measuring the surface deformation of materials. Then, the relationships between the load and displacements were studied; Finally, the impact of loading history on the CMOD, crack length (L c), stiffness (S), dissipated energy, fracture energy (G F), strain concentration zone (SCZ) and damage zone were investigated. The experimental results indicated that the bearing capacity, deformation performance and the G F of HSC were not affected by the loading and unloading process; under cyclic loading, as the dimensionless crack mouth opening at the unloading point (CMODduni) increases, the dimensionless residual crack mouth opening (CMODdri) gradually increases while the load degradation rate (φ) gradually decreases; in the i th cycle of the post-peak stage, the crack opening rate was greater than the crack growth rate when the beam was loaded to the peak point from the reloading point. To quantify the damage degree of the single-edged notched beam, damage index (D) was calculated, which is more suitable obtained from the damage zone-based method than that calculated from the P-CMOD curve.
Fracture and damage properties of high-strength concrete under cyclic loading
Chen, Hongniao (author) / Liu, Dengkai (author)
2022-10-16
Article (Journal)
Electronic Resource
English
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