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Related Concept Videos

Creep in Concrete01:22

Creep in Concrete

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Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
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Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...
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Effects of Creep01:25

Effects of Creep

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Creep in concrete, the gradual deformation under prolonged stress, significantly impacts the integrity of structures. For reinforced concrete beams, it can be a vital design consideration, as it increases deflection, sometimes necessitating additional design measures. In columns, especially slender ones under eccentric loads, creep can cause buckling, compromising their stability. However, creep can be beneficial in indeterminate structures by mitigating stresses that arise from shrinkage,...
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Deformation of Member under Multiple Loadings01:11

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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
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Elasticity in Concrete01:20

Elasticity in Concrete

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Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear...
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Related Experiment Video

Updated: Dec 18, 2025

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture
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Mudstone creep experiment and nonlinear damage model study under cyclic disturbance load.

Jun-Guang Wang1, Qing-Lin Sun2, Bing Liang2

  • 1School of Mechanics & Engineering, Liaoning Technical University, Fuxin, Liaoning, China, 123000. wangjunguang@lntu.edu.cn.

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|June 11, 2020
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Summary

Disturbed load significantly impacts mudstone creep properties. Disturbance amplitude and frequency linearly influence deformation, affecting long-term stability of deep rock masses.

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Area of Science:

  • Geotechnical Engineering
  • Rock Mechanics
  • Materials Science

Background:

  • Understanding rock mass stability is crucial for deep underground engineering.
  • Creep deformation under disturbed conditions presents unique challenges.
  • Mudstone's creep behavior is sensitive to external loading perturbations.

Purpose of the Study:

  • To investigate the creep characteristics of mudstone under disturbed triaxial compression.
  • To analyze the influence of disturbance amplitude and frequency on creep deformation.
  • To develop and validate a nonlinear disturbance creep damage model for mudstone.

Main Methods:

  • Conducting triaxial compression disturbance creep tests on mudstone using a specialized test bench.
  • Analyzing creep deformation stages and parameters under varying disturbance conditions.
  • Establishing a nonlinear disturbance creep damage model based on Burger's model and employing improved least squares for parameter identification.

Main Results:

  • Disturbance significantly alters mudstone creep properties, with varying effects across creep stages.
  • Instantaneous deformation, creep decay time, and steady creep rate exhibit exponential relationships with axial pressure and linear relationships with disturbance factors.
  • Disturbance amplitude shows a pronounced effect on instantaneous deformation, steady-state creep rate, and accelerated creep.

Conclusions:

  • The developed nonlinear disturbance creep damage model accurately simulates mudstone creep under various disturbance scenarios.
  • Mudstone creep demonstrates adaptability under specific disturbed conditions.
  • This research provides critical insights for ensuring the long-term stability of deep rock masses in complex environments.