Method for predicting ultra-slow creep of concrete
A technology of concrete and creep, which is applied in the direction of measuring device, strength characteristics, and the use of stable tension/compression to test the strength of materials, etc., can solve problems such as complex forms, and achieve the effect of predicting and indirectly controlling structural damage and destruction
Active Publication Date: 2021-03-12
HOHAI UNIV
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However, such a treatment method leads to the introduction of more material parameters into the constitutive equation, which also makes the constitutive relation have a complex form
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[0045](1) In this example, high-strength self-compacting concrete is used as the experimental specimen, and a creep load (uniaxial) is applied to the specimen by using a plane hydraulic jack. To keep the stress constant throughout the test, experimenters attached jacks to bottles filled with pressurized nitrogen (about 80%) and oil (about 20%) to counteract volume changes due to deformation of the sample specimen. In this experiment, the load was applied at a speed of about 0.2MPa / s. In the MTS testing machine, after 16 hours of aging, the concrete specimen is loaded with a 30% stress-intensity ratio, that is, the initial stress is 16.56MPa, and the stress-intensity ratio remains constant for at least 600 days. Under the initial conditions, the experiment uses a linear displacement sensor (LVDT) to record the strain of the specimen within 600 days, so that the creep experiment data of concrete can be obtained. For more detailed experimental equipment and experimental process,...
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The invention discloses a method for predicting ultra-slow creep of concrete, which comprises the following steps of: S1, selecting certain concrete as a research object, and determining to carry outa creep experiment on the concrete to obtain creep experiment data of the concrete; S2, constructing a local structure derivative Maxwell constitutive relation model by adopting a structure dashpot; S3, under the creep experiment condition of the concrete in the step S1, obtaining a creep equation with parametersof the concrete according to the constitutive relation model in the step S2; S4, obtaining the parameters in the creep equation through data fitting according to the creep experiment data of the concrete; and S5, substituting the parameters in the creep equation into the creep equationin the step S3 to obtain a complete concrete creep equation, and predicting the ultra-slow creep process of the concrete according to the concrete creep equation. According to the method, the accuracy of the creep constitutive relation of the concrete is improved, and structural damage and destruction caused by ultra-slow deformation of the concrete can be effectively predicted and indirectly controlled.
Description
technical field [0001] The invention relates to the application of civil engineering materials, in particular to a method for predicting ultra-slow creep of concrete. Background technique [0002] Concrete is a typical viscoelastic material, and viscoelastic materials usually exhibit two properties: elastic and viscous. Concrete creep is a mechanical phenomenon in which the strain increases with time while the stress remains constant. As a composite material with multiple components and complex structure, the creep characteristics of concrete are always one of the important indicators to evaluate the mechanical properties of concrete building materials. Engineering practice shows that the cracking and instability of concrete structures do not occur immediately after the pouring is completed, but are caused by the continuous adjustment and development of the stress and strain of the concrete structure over time, and after a long period of accumulation. When the damage of co...
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IPC IPC(8): G01N3/08G16C60/00
CPCG01N3/08G01N2203/0003G01N2203/0071G01N2203/0075G01N2203/0092G01N2203/0252G16C60/00
Inventor 梁英杰管佩瑶
Owner HOHAI UNIV