A method for establishing a microscopic finite element model of hybrid fiber concrete

By generating aggregates and fibers based on Monte-Carlo, and performing meticulous component identification and hexahedral meshing, the problem of establishing finite element models of mixed fiber concrete in the prior art is solved, and efficient and accurate simulation analysis is achieved.

CN116822309BActive Publication Date: 2025-03-28KUNMING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202310917414.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-07-25
Publication Date
2025-03-28
Estimated Expiration
2043-07-25

AI Technical Summary

Technical Problem

The prior art is difficult to efficiently establish a finite element model of mixed fiber concrete at a meticulous scale, especially in the control of aggregates, fiber volume ratios and grid division, resulting in long calculation time and unstable simulation results.

Method used

The Monte-Carlo-based method is used to randomly generate aggregates and fibers, and the volume ratio is ensured to meet the set value through intrusion determination, and the mesoporous component units are identified using Fortran programming. The model is finally projected into the homogeneous finite element model of the container and hexahedral mesh is performed.

Benefits of technology

The establishment of a meticulous finite element model of mixed fiber concrete with simple operation and high result accuracy is achieved, which significantly shortens the calculation time and improves the convergence and accuracy of the simulation results.

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Abstract

The invention discloses a method for establishing a mesoscopic finite element model of a mixed fiber concrete. Aggregates are randomly generated in a set area, and an intrusion judgment is performed between the newly generated aggregates and the generated aggregates. If no intrusion occurs, the cumulative volume rate of the aggregates is calculated until the volume rate requirement is met. After the aggregate generation is completed, the first fiber is randomly generated according to fiber-related parameters, and an intrusion judgment is performed between the fiber and the aggregate, and between the fibers. If no intrusion occurs, the cumulative volume rate of the fibers is calculated until the volume rate requirement is met. Mesoscopic component units are identified by using Fortran programming to complete the establishment of a mesoscopic finite element model of a mixed fiber concrete. The invention incorporates mixed fibers on the basis of a mesoscopic aggregate concrete model, and solves the problem of grid division. The overall model adopts hexahedral grid division, which solves the problems of long tetrahedral grid calculation time and low convergence of calculation results, effectively improves the calculation efficiency and accuracy of the finite element model, and at the same time makes the contact between the mesoscopic components better, and can be applied to various static and dynamic experimental simulations.
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