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Related Concept Videos

Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

349
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
349
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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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

619
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...
619
Microcracking in Concrete01:20

Microcracking in Concrete

249
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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Eccentric Loading01:16

Eccentric Loading

596
Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
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Related Experiment Video

Updated: Oct 24, 2025

Determination of the Mechanical Properties of Flexible Connectors for Use in Insulated Concrete Wall Panels
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Study on mechanical behavior and damage process of concrete with initial damage under eccentric load.

Ge Lina1,2, Yi Fu3, Zhou Junxia3

  • 1College of Architecture and Transportation, Liaoning Technical University, No. 88 Yulong Road, Xihe District, Fuxin, 123000, Liaoning, People's Republic of China. gln8223@163.com.

Scientific Reports
|August 13, 2021
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Summary

Eccentric load compression tests reveal that while eccentric loads reduce peak stress and crack initiation stress in damaged concrete, they do not alter the fundamental relationships with confining pressure. Microcrack evolution follows three distinct stages under both uniform and eccentric loading.

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Geotechnical Engineering

Background:

  • Concrete structures are susceptible to initial damage, affecting their mechanical behavior under load.
  • Understanding the influence of eccentric loading is crucial for structural integrity assessment.
  • Confining pressure significantly impacts concrete's compressive strength and failure mechanisms.

Purpose of the Study:

  • To investigate the effect of eccentric load on the mechanical properties and damage evolution of pre-damaged concrete.
  • To analyze the role of varying confining pressures on concrete's response to eccentric loading.
  • To characterize the crack patterns and microcrack development under eccentric compression.

Main Methods:

  • Numerical simulations using the PFC (Particle Flow Code) program.
  • Simulating eccentric load compression tests on concrete specimens with initial damage.
  • Applying different confining pressures during the compression tests.

Main Results:

  • Eccentric loading decreases peak stress and crack initiation stress compared to uniform loading, but the relationship with confining pressure remains consistent.
  • The peak stress increase coefficient under uniform load is higher than under eccentric load, showing a linear dependency on confining pressure.
  • Distinct crack types (Type I shear and bending type shear) were observed under uniaxial and biaxial eccentric compression, respectively.
  • Microcrack propagation occurred in three stages: calm, pre-peak expansion, and rapid increase post-peak.

Conclusions:

  • Eccentric loads significantly alter the failure characteristics of damaged concrete, reducing its load-bearing capacity.
  • Confining pressure plays a vital role in mitigating the effects of eccentric loading, albeit with reduced efficacy compared to uniform loading.
  • The observed crack patterns and microcrack evolution provide insights into the failure mechanisms of concrete under complex loading conditions.