Concrete constitutive model calculation method based on steel bar three-dimensional reinforcement effect

Abstract

The invention discloses a concrete constitutive model calculation method based on a steel bar three-dimensional reinforcement effect, and relates to a modeling method for nonlinear failure of a reinforced concrete bridge. Obtaining material mechanical properties of the concrete and the steel bars; the method comprises the following steps: establishing a single-axis stressed reinforced concrete cube unit, decomposing the single-axis stressed reinforced concrete cube unit into a one-dimensional axial stressed unit and a two-dimensional normal stressed unit, and respectively calculating reinforcement coefficients of steel bars to concrete to obtain elastic modulus; performing tension and compression stress-strain curve correction on the reinforced concrete cube unit subjected to uniaxial stress, and correcting damage evolution parameters to obtain a corrected constitutive relation curve; the method is applied to a finite element to establish a three-dimensional entity nonlinear finite element model, and calculation of plastic damage and bearing capacity of a reinforced concrete structure is carried out. The reinforcement coefficient of the steel bars to the concrete is considered, and meanwhile, a corrected reinforced concrete constitutive model is provided, so that the actual ultimate bearing capacity of the bridge can be efficiently and accurately evaluated.

Description

technical field [0001] The invention relates to a modeling method for nonlinear damage of reinforced concrete bridges, in particular to a concrete constitutive model calculation method based on the three-dimensional strengthening effect of steel bars, belonging to the technical field of bridge engineering mechanical performance analysis. Background technique [0002] As a key component of modern transportation infrastructure, bridges occupy an important strategic position in national and regional economic development. In recent years, more and more reinforced concrete bridges have been constructed and put into service, which has greatly improved the efficiency of my country's transportation and promoted rapid economic growth. [0003] Mastering the ultimate bearing capacity and safety margin of a bridge is a necessary condition before it is put into use on a large scale, and it is an important prerequisite to ensure the safe driving of vehicles. For the research on the safe...

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Problems solved by technology

[0005] In order to solve the problem that the existing reinforced concrete constitutive model is not suitable for simulating the nonlinear failure behavior of large-volume reinforced concrete bridge structures, the modeling process is complicated and the calculation cost is extremely high, the present invention provides a three-dimensional The calculation method of the concrete constitutive model of the reinforcement effect, which uses concrete as the basic material and steel bars as the auxiliary reinforcement effect material, establishes a three-dimensional orthogonal unit and decomposes it into a one-dimensional axial force unit and a two-dimensional normal force unit, Considering the strengthening coefficient of steel bars to concrete, and at the same time, a modified reinforced concrete constitutive model is proposed, which can efficiently and accurately evaluate the ultimate bearing capacity of actual bridges

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