Adaptive concrete mesoscopic modeling method

A modeling method and concrete technology, applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve the effect of improving calculation accuracy

Active Publication Date: 2018-04-17
SOUTHEAST UNIV
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Problems solved by technology

The improvement of the fineness of the model means that it is closer to the actual situation, but it also increases th

Method used

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  • Adaptive concrete mesoscopic modeling method
  • Adaptive concrete mesoscopic modeling method
  • Adaptive concrete mesoscopic modeling method

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Experimental program
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Effect test

Embodiment

[0037] step 1):

[0038] (a) Determine the boundary coordinates of the model, assuming (x l , Y l ), (x r , Y r ). Calculate the particle size D in the section is smaller than the mesh D 0 Probability in range P c (D0 ):

[0039]

[0040] Where P k It is the percentage of the aggregate volume in the concrete specimen to the total volume.

[0041] Calculate the number of aggregate particles of each particle size as follows:

[0042] Where n i Is the number of particles in a certain size range; A i , A are the aggregate area and the cross-sectional area respectively. For a round aggregate with a diameter of D, the area is: A=πD 2 / 4.

[0043] (b) Randomly generate the aggregate particle size r within the range of each grade i .

[0044] (c) Generate aggregate geometric center coordinates (x, y) within the boundary of the model and aggregate particle size r within the corresponding particle size range i , Its relationship is as follows:

[0045]

[0046] Where u is the distance between the...

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Abstract

The present invention discloses an adaptive concrete mesoscopic modeling method. The method comprises the following steps: 1) generating a required circular boundary according to the concrete aggregate gradation, generating convex polygonal aggregates within a circular boundary, carrying out prolongation on the area of the convex polygonal aggregate, and determining prolongation point intrusion atthe same time to generate a convex polygonal aggregate concrete model; and 2) setting an inner polygon mesh transition circle inside each convex polygon aggregate, setting an outer polygon mesh transition circle between an aggregate-slurry interface transition zone and the cement mortar, adjusting the polar radius of the aggregate to obtain vertex coordinates of the aggregate-slurry interface transition zone and the inner and outer mesh transition circles, setting the thickness of the aggregate-slurry interface transition zone according to the aggregate particle size, setting the mesh size onthe inner and outer mesh transition circles, and obtaining a mesh-adaptive concrete multi-phase mesoscopic model. According to the method disclosed by the present invention, the random placement of aggregates and the generation of adaptive meshes in the mesoscopic model can be realized, the calculation efficiency can be improved while ensuring the calculation accuracy of different regions withinthe model.

Description

Technical field [0001] The invention relates to a mesoscopic modeling technology, in particular to an adaptive concrete mesoscopic modeling method, belonging to the technical field of mesoscopic simulation of concrete damage and destruction. Background technique [0002] With the development of computer technology, the meso-level numerical simulation method is widely used in the analysis of concrete damage and destruction. Among them, the establishment of mesoscopic model is an important part. Facing the complex internal structure of concrete, a reasonable mesoscopic modeling method is the key to analyzing concrete damage. The increase in the refinement of the model means that it is closer to the actual situation, but it also increases the calculation scale, which creates the problem of how to balance the refinement of the model and the calculation scale. If the actual geometric form of the aggregate-mortar interface transition zone (ITZ) is considered, the calculation scale wi...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 郭小明吴佰建孙骁晓郭力
Owner SOUTHEAST UNIV
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