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Concrete damage accumulation analysis method under cyclic load

An analysis method and concrete technology, applied in the direction of analyzing materials, measuring devices, instruments, etc., can solve problems such as inaccurate analysis results and inability to reflect hysteresis effects.

Active Publication Date: 2020-03-27
江西省水利科学研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to provide a method for analyzing the accumulation of concrete damage under cyclic loads, to solve the problem that the existing analysis cannot reflect the hysteretic effect of concrete under cyclic loads, and the analysis results are inaccurate

Method used

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  • Concrete damage accumulation analysis method under cyclic load
  • Concrete damage accumulation analysis method under cyclic load
  • Concrete damage accumulation analysis method under cyclic load

Examples

Experimental program
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Effect test

Embodiment 1

[0093] Establish a numerical example based on the Gopalaratnam and Shah cyclic tensile test, a 1m×1m×1m three-dimensional eight-node isoparametric element model such as figure 1 As shown in , the normal constraints are imposed on the nodes on the left and bottom sides of the unit, and the strain on the right nodes is loaded in stages according to the test data.

[0094] Image 6 The simulation results of the analysis method of the present invention are compared with the test data and the simulation results of the traditional elastic-plastic analysis method. It can be seen from the figure that the method of the present invention can better simulate the hysteresis effect produced in the process of repeated loading and unloading under the action of cyclic loads, and is consistent with The experimental observation data can be well fitted. Especially when the unloading curve is close to the residual strain point, it turns into a reloading behavior feature point, i.e. the lowest po...

Embodiment 2

[0098] The model parameters and boundary conditions are the same as in Example 1, and the graded strain loading will be divided into five stages: tension-unloading-compression loading-unloading-tensioning to verify the complete description of the total stress-strain curve of concrete by the analysis method of the present invention.

[0099] Figure 8 and Figure 9 The total stress-strain curve and damage evolution process of the concrete analysis method under repeated tensile and compressive loads are respectively given in the present invention, which includes the tension elastic loading section, the tension softening loading section, the tension softening unloading section, and the tension-compression conversion Section, pressure softening loading section and pressure softening unloading section further verify the correctness and applicability of the analysis method of the present invention.

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Abstract

The invention discloses a concrete damage accumulation analysis method under cyclic load. The method comprises the following steps: firstly, establishing a three-dimensional isoparametric unit finiteelement model representing a concrete material; selecting a model, applying a normal grading load on a single side, giving a boundary condition, and determining a calculation time step; converting themulti-axis strain into unit single-axis equivalent strain through a four-parameter equivalent strain calculation method, and judging the tension and compression state of the unit; judging the loadingand unloading state of the current time step unit, and calculating the residual plastic strain and equivalent stress of the current time step unit; and calculating a unit damage variable based on a strain equivalence principle. According to the method, the influence of the hysteretic effect of the softening section of the concrete stress-strain curve under cyclic load is considered; the loading and unloading path of the hysteretic effect is defined, the damage accumulation process of the concrete material under the cyclic load can be accurately simulated, the method can be used for researching the dynamic performance of the concrete material, and actual guiding significance is provided for actual concrete structure anti-seismic analysis.

Description

technical field [0001] The invention relates to a concrete damage accumulation analysis method, in particular to a concrete damage accumulation analysis method under cyclic loading. Background technique [0002] As an unconventional load, earthquake load occupies a very important position in the safety analysis of current engineering structures, just like conventional loads. Unconventional loads are powerfully destructive and uniquely unpredictable, especially in the form of cyclic loads, which makes the nonlinear characteristics of concrete materials more and more intense. [0003] At present, the description of the dynamic performance of concrete materials in the seismic design of engineering structures is very limited. The Code only stipulates that when the large-volume hydraulic concrete structure does not undergo a special material dynamic performance test, the standard value of the concrete dynamic strength can be increased by 20% compared with the static standard val...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0005G01N2203/0017G01N2203/0019G01N2203/0075G01N2203/0208G01N2203/0682G01N2203/0676
Inventor 刘智赵兰浩吴晓彬王姣胡国平
Owner 江西省水利科学研究院
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