Meso-structure simulation based concrete creeping property prediction method

Abstract

The invention belongs to the field of civil engineering and particularly relates to a meso-structure simulation based concrete creeping property prediction method. The meso-structure simulation based concrete creeping property prediction method comprises the following steps of 1 identifying concrete structure constituents and proportions; 2 preparing single-constituent samples; 3 respectively performing creep tests on the single-constituent samples; 4 establishing creep models on the single-constituent samples; 5 performing inversion to obtain creep parameters of the single-constituent samples; 6 conducting random geometric modeling on a concrete sample according to the constituents and proportions; 7 calculating and predicting the creeping property of the concrete sample. The meso-structure simulation based concrete creeping property prediction method can simulate the constitution situation of actual constituents of an actual concrete work, is not limited in laboratories and is wide in application range.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a method for predicting creep properties of concrete based on mesoscopic fabric simulation. Background technique [0002] Concrete creep, also known as "creep", refers to the phenomenon that the deformation of concrete structures will increase with time under continuous load. Creep can cause the loss of prestress in prestressed concrete structures; in long-span beams, creep can also increase the deflection of the beam, these are the harmful effects of creep on the structure. On the other hand, in mass concrete structures, creep can reduce temperature stress and reduce shrinkage cracks; in structural stress concentration areas and structures with local stress caused by uneven foundation subsidence, creep can reduce the peak stress of the structure, these It will also have a beneficial effect on the structure. Therefore, the creep problem of concrete is very important...

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Problems solved by technology

[0006] 1. The article "The Influence of Fly Ash Content and Water-Binder Ratio on the Creep Performance of High Performance Concrete and Its Mechanism" studied the influence of fly ash content and water-binder ratio on the creep performance of concrete (see Journal of Civil Engineering "No. 12, 2009, author: Zhao Qingxin), this method mainly considers the influence of fly ash content and water-cement ratio on creep, but does not consider the influence of concrete component ratio, nor does it consider the space of coarse and fine aggregates. Distribution;

[0007] 2. The article "Preliminary Research on Biaxial Compression Creep Experiment of Concrete" introduces the experimental curve of concrete biaxial compression creep. (See "Journal of Tsinghua University (Natural Science Edition)" 2001 No. 11, author: Gao Hu, etc.) , the sample size of this method is 100mm×100mm×300mm, but it is limited to reflect the creep properties of small test blocks in the laboratory, and cannot be extended to more working conditions;

(See "Engineering Mechanics" Issue 10, 2013, author: Fu Qiang, etc.), the specimen in this paper is a cylindrical specimen of φ50×100mm, and the statistical damage model of concrete triaxial creep is established by introducing damage variables, but Does not take into account the influence of the proportion of concrete components

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