Method for quickly generating two-dimensional random aggregate model of concrete with pebbles and crushed stones

Abstract

The invention discloses a method for rapidly generating a grait and gravel mixed concrete two-dimensional random aggregate model. A concrete two-dimensional random aggregate model only with grait or gravel is the special circumstance of the grait and gravel mixed concrete two-dimensional random aggregate model. The method comprises the steps that a circular random aggregate model and a Thiessen polygon with the boundary are combined, and the circle center of the circular aggregate is adopted as a control point to generate the Thiessen polygon similarly meeting the aggregate gradation; the peak of each Thiessen polygon is adopted as a control point, a closed B spline is generated in parallel to represent the shape of the grait aggregate, points are sampled randomly and uniformly on the closed B spline curve, and therefore the polygon is generated to represent the shape of the gravel aggregate. By adopting the parallel mode, area zooming is performed on the aggregate inside each Thiessen polygon, and the grait and gravel freely mixed concrete two-dimensional random aggregate model meeting the given gradation is rapidly generated.

Description

technical field [0001] The invention belongs to the technical field of concrete mesoscopic numerical test pretreatment, in particular to a method for quickly generating a concrete two-dimensional random aggregate model mixed with pebbles and crushed stones. Background technique [0002] Concrete is a heterogeneous composite material composed of aggregate and cement mortar, in which the shape and spatial distribution of aggregate have a great influence on the performance of the material. With the continuous development of computer technology and the continuous maturity of related numerical calculation technology, the concrete random aggregate model, which considers the internal mesoscopic structure of concrete aggregate shape, gradation and mortar interface, has begun to be used to study the mesoscopic structure of materials. Destruction mechanism. At present, the method of simplifying the aggregate to a circular shape and using the Monte Carlo method to randomly place it in...

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Problems solved by technology

Due to the way of putting aggregates one by one, it is necessary to repeatedly judge the overlap between the aggregates. The aggregates are irregular particles. After the aggregates are placed at the set position, it is necessary to judge whether the aggregates overlap. Therefore, it leads to: ①The calculation takes a long time, ranging from a few minutes to tens of minutes; ②The CPU consumes a lot, the computer runs slowly, and the computer generates heat and noise; ③It is difficult to achieve parallel processing; ④The content of aggregate input (aggregate The proportion of the area of ​​the area to the area of ​​the entire concrete section area) is low and other limitations, which may not match the actual proportion

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