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Establishment and application of 2D mesoscopic stochastic concrete model(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2017年03期
Page:
53-63
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Establishment and application of 2D mesoscopic stochastic concrete model
Author(s):
HU Da-lin;  ZHANG Li-xing;  CHEN Ding-shi
1. Key Laboratory of Bridge Detection & Reinforcement Technology of Ministry of Transport, Chang’an University, Xi’an 710064, Shaanxi, China; 2. CCCC First Highway Consultants Co., Ltd., Xi’an 710061, Shaanxi, China
Keywords:
bridge engineering;  concrete;  stochastic aggregate model;  packing algorithm;  MATLAB;  meso-level;  mesh generation
PACS:
U414
DOI:
-
Abstract:
In order to establish a mesoscopic stochastic concrete model, concrete was assumed as a two-phase composite material consisting of coarse aggregate and cement mortar. According to common aggregate type, aggregate cross section shape was assumed to be round, oval and convex polygon. Random packing algorithm of 2D pebble and crushed stone aggregate was established, and corresponding program was compiled by using MATLAB software, thus numerical calculation of meso-level stochastic concrete model was established. To make stochastic concrete model generated by MATLAB be called by finite element programs, so as to conduct further analysis of physical and mechanical properties of concrete, a program called fig2dxf was developed and graphic files in MATLAB was converted into .dxf format. Thus, seamless connection between stochastic aggregate model and finite element software was realized. The results show that stochastic aggregate model generated in this paper satisfies the equivalence of aggregate volume, and ensures the randomness of aggregate particle size. Content of aggregate reaches a high level. Circular and elliptic stochastic mixed aggregate models are more in accord with randomness requirements and actual conditions. Random packing algorithm of convex polygon aggregate is simpler, and skillfully eliminates the sharp angles of polygon aggregate. Mesh generation of stochastic aggregate can be carried out through finite element software such as ANSYS and good results are obtained. Standard random concrete specimens generated by this model conform to the specification requirements, and satisfy the needs of finite element analysis. The research results provide reliable basis for further analysis of meso-level physical and mechanical properties of concrete.

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Last Update: 2017-06-06