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A stochastic generation method for graded distribution of two-dimensional concrete aggregates

A technology for random generation of concrete aggregates, applied in geometric CAD, climate sustainability, design optimization/simulation, etc., can solve the problem of not being able to generate concrete aggregates gradually, and achieve strong use value, simple software, and easy operation. convenient effects

Active Publication Date: 2022-07-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the above-mentioned existing numerical simulation technology cannot generate concrete aggregates step by step, and propose a method for generating a two-dimensional concrete random aggregate geometric model step by step

Method used

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  • A stochastic generation method for graded distribution of two-dimensional concrete aggregates
  • A stochastic generation method for graded distribution of two-dimensional concrete aggregates
  • A stochastic generation method for graded distribution of two-dimensional concrete aggregates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 is a random aggregate geometric model of concrete Brazilian discs

[0032] Step 1. Determine the two-dimensional target area for aggregate delivery and the area of ​​the target area

[0033] In this embodiment, the target delivery area is a circle, the radius R is 75mm, and the area of ​​the target area is 17671.46mm 2 .

[0034] Step 2: Determine the three-dimensional gradation of aggregates, and calculate the probability of different graded aggregates appearing in the two-dimensional delivery target area according to the Lavalvin formula, as the two-dimensional gradation of aggregates, combined with the delivery target determined in step 1. The total area of ​​the area is calculated, and the theoretical value of the aggregate area at all levels is calculated.

[0035] In this example, only three gradations of aggregates with a particle size of 5mm to 10mm, 10mm to 16mm, and 16mm to 20mm are used to construct polygons. Aggregates with a particle size of les...

Embodiment 2

[0062] Example 2 is a two-dimensional random aggregate geometry model for the mesoscopic simulation of concrete uniaxial compression. The aggregate delivery area is a square of 100mm×100mm, and the aggregate is delivered in a single-grade distribution, and the coarse aggregate particle size is 5-10mm. The final two-dimensional random aggregate geometric model obtained by the present invention is as follows: Figure 4 shown. The area fractions of aggregates were 16.9%, respectively, and the theoretical calculation results were 16.6%, respectively. The errors are 0.3% respectively.

[0063] The invention can set any gradation according to the requirements, and generate the required concrete aggregate geometric model according to the theoretical content of the aggregates at all levels.

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Abstract

The invention is a random generation method of a multi-gradation two-dimensional concrete aggregate model. The steps are as follows: 1. Determine the two-dimensional target area for aggregate delivery and the area of ​​the target area; Step 2. Determine the three-dimensional gradation of aggregates, and calculate the appearance of aggregates with different gradations on the two-dimensional delivery target area according to the Lavalvin formula. The probability of , as the two-dimensional gradation of aggregates, combined with the total area of ​​the target area determined in step 1, calculate the theoretical value of the aggregate area at all levels; step 3, in the target area, according to the gradation from large to small In the order of grading, random polygons that meet the requirements of two-dimensional grading are generated as aggregate geometric models. Using this method to generate random polygonal concrete aggregates can ensure that the aggregate particle size is within the design gradation range. The difference between the content of the aggregates at all levels and the theoretical calculation value is no more than 4%, and the accurate generation of the polygonal random aggregates can be realized.

Description

technical field [0001] The invention relates to a two-dimensional random generation method of concrete polygonal aggregates, belonging to the technical fields of mesoscopic numerical simulation preprocessing technology and building materials. [0002] technical background [0003] Concrete has the advantages of wide source of raw materials, low price and good durability, and has become a building material widely used in engineering structures. At the mesoscopic level, hardened concrete can be viewed as a three-phase composite consisting of aggregate, cement mortar, and the interface between the two (ITZ). With the in-depth research on the mechanical properties of concrete, the current research on the mechanical properties of concrete mainly focuses on two aspects, one is the relationship between the macroscopic mechanical properties of concrete and the microscopic properties of each phase medium, and the other is cracks in the process of concrete failure. Extended form. In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F30/13
CPCG06F30/20G06F30/13Y02W30/91
Inventor 任会兰宁建国宋水舟马天宝栗建桥
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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