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Concrete creep prediction method considering damage influence

A prediction method and concrete technology, applied in the fields of instrumentation, computational theoretical chemistry, informatics, etc., can solve the problems of low prediction accuracy of concrete creep deformation

Active Publication Date: 2020-06-09
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a concrete creep prediction method considering the influence of damage, which solves the problem of low prediction accuracy of concrete creep deformation under high load levels in existing concrete creep prediction methods

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  • Concrete creep prediction method considering damage influence
  • Concrete creep prediction method considering damage influence

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Embodiment Construction

[0064] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0065] A kind of concrete creep prediction method considering damage influence of the present invention, specifically comprises the following steps:

[0066] Step 1, according to the creep test value measured under the continuous load level of 15% to 25% of the concrete compressive strength, the compound shape method is used, and the sum of the residual squares of the creep test value and the creep calculation value is used as the objective function, Eight parameters f in the inversion creep degree formula i , g i ,p i and r i (i=1,2), the creep degree formula is as follows:

[0067]

[0068] In the formula: C(t,τ) is the degree of creep, and its dimension is MPa -1 ; f i , g i ,p i , r i (i=1,2) are the 8 parameters of creep degree formula, f 1 , g 1 ,p 1 , r 1 It is used to characterize the reversible creep characteristics o...

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Abstract

The invention discloses a concrete creep prediction method considering damage influence. The method comprises the following steps: taking the residual quadratic sum of a creep test value and a creep calculation value as a target function, inverting parameters in the creep degree formula, constructing a general creep degree formula, determining a damage variable, constructing a concrete creep prediction model based on the general creep degree formula and the damage variable, and completing prediction of the concrete creep process by adopting the constructed concrete creep prediction model. According to the concrete creep prediction method, influence of damage such as cracks on the creep deformation development process is comprehensively considered; the method has high fitting precision, anerror between a creep deformation result of the concrete obtained through the method and the actual deformation result of the concrete is small, powerful theoretical support can be provided for designof a concrete structure and durability and safety evaluation of the concrete structure, and the application value is high.

Description

technical field [0001] The invention belongs to the technical field of concrete creep prediction and relates to a concrete creep prediction method considering damage influence. Background technique [0002] Under continuous load, concrete will produce continuously increasing deformation, which is the so-called creep deformation. Relevant experimental studies have shown that the creep deformation behavior of concrete is closely related to the sustained load level it bears. When the load level is low, the concrete creep deformation is linearly related to the sustained load level. With the increase of the sustained load level, the concrete The creep deformation gradually becomes nonlinear with the sustained load level. [0003] According to the theory of micro-cracks, concrete is an inhomogeneous composite material composed of aggregates of different particle sizes, cementitious mortar materials, and water. There are certain tiny cracks and voids, that is, damage. When the c...

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Application Information

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IPC IPC(8): G16C10/00G16C60/00G06F30/23G06F111/10
CPCG16C10/00G16C60/00
Inventor 李炎隆卜鹏刘云贺陈俊豪黎康平马辉邱文黄灵芝
Owner XIAN UNIV OF TECH
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