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![Comparison of the main models (í µí± = 80 MPa) [9,15,20,21].](publication/369571189/figure/fig1/AS:11431281131132077@1680028457578/Comparison-of-the-main-models-i-i-80-MPa-9-15-20-21.png)
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![Figure 1. Comparison of the main models (í µí± = 80 MPa) [9,15,20,21].](publication/369571189/figure/fig1/AS:11431281131132077@1680028457578/Comparison-of-the-main-models-i-i-80-MPa-9-15-20-21_Q320.jpg)
High-strength concrete can effectively reduce the cross-sectional size, increase space usage, and cut material costs. To analyze the mechanical properties of high-strength concrete vertical members, various confinement models have been proposed to define the ties-confined concrete stress–strain relationship. However, most existing models are divide...
Contexts in source publication
Context 1
... an increase in the lateral confinement degree, the concavity of the descending section of the complete curve gradually decreases, and the radius of curvature at the corresponding concave point gradually increases. The complete curve geometry with different lateral confinement ratios is shown in Figure 11. The complete geometric characteristics of the curve of confined high- From Figure 10, the ties strain in Razvi's model increases with an increase in the effective confinement coefficient; however, the rate of increase gradually slows down. ...
Context 2
... an increase in the lateral confinement degree, the concavity of the descending section of the complete curve gradually decreases, and the radius of curvature at the corresponding concave point gradually increases. The complete curve geometry with different lateral confinement ratios is shown in Figure 11. The complete geometric characteristics of the curve of confined high-strength concrete are essentially similar to those of unconfined concrete. ...
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Reinforced concrete columns are structural members used to carry compressive loads. Column planning is important, considering that the column is the main structural element supporting the loads on a building. Column planning is generally used in moment and axial force interaction diagrams for a certain reinforcement ratio. Although there is current...
Citations
... In existing studies [6][7][8][9][10], the mechanical properties of concrete under complex conditions have been analyzed by adjusting the correlation coefficients of uniaxial mechanical properties. However, the simplified analysis method cannot reflect the real mechanical response. ...
... where H n is the hardening parameter, which can be the corresponding spherical stress when the generalized shear stress is zero (i.e., J 2 = 0). By combining Equations (8) and (12), as follows: ...
In composite structures or complex concrete members, some concrete bears multiple forces, called core concrete. The properties of the core concrete are variable under complex stress conditions, which will influence the structure performance analysis. Therefore, it is necessary to establish an accurate and theoretical constitutive model of concrete under complex stress conditions. The elastic–plastic properties of concrete in complex stress conditions were analyzed first. Then, the failure criterion of concrete in complex stress conditions was discussed to identify the key parameters. And the relationship between the stress–strain curve and failure criterion was analyzed through mathematical derivation. Finally, the multi-dimensional iterative constitutive model of concrete under complex stress conditions was established and verified. Based on the analysis results, the concrete under multi-axial stress conditions shows a spindle-shape stress envelope diagram. The failure criterion should be established by the analysis of concrete under high multi-axial compression conditions, tension–compression conditions, and shear–compression conditions. The plastic modulus is the key to reflecting the plastic strain development trend and the stress–strain relationship.
