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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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Deformations in a Transverse Cross Section01:21

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When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
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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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Factors Affecting Creep01:28

Factors Affecting Creep

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In normal-weight aggregate concrete, the hardened cement paste is the primary contributor to creep, whereas the aggregates, being stiffer than the cement paste, are more resilient to stress-induced deformation. The stiffness of the aggregates is defined by their modulus of elasticity, and the more voluminous they are in the concrete, the less it will creep.
Further, the water/cement ratio is critical, as a lower ratio increases concrete strength, thus reducing creep. The strength of the...
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Plastic Deformations01:19

Plastic Deformations

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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Stress-Strain Diagram - Ductile Materials01:24

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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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Creep-dilatancy development at a transform plate boundary.

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This summary is machine-generated.

Slow-slip events, where tectonic plates move gradually, are linked to pore-pressure changes. This study shows how fluid pressure and ground deformation are coupled, offering insights into earthquake cycles.

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Area of Science:

  • Earthquake science
  • Tectonophysics
  • Geomechanics

Background:

  • Tectonic plate movement along boundaries occurs slowly and episodically.
  • Understanding the mechanisms behind slow-slip events is crucial for earthquake science.

Purpose of the Study:

  • To demonstrate the coupling between pore-pressure and deformation during a slow-slip event.
  • To investigate the hydro-mechanical processes influencing the seismogenic zone.

Main Methods:

  • Utilized offshore in-situ sediment pore-pressure data near the Main Marmara Fault.
  • Analyzed onshore geodetic time-series data from a GPS station.
  • Correlated pore-pressure fluctuations with transient deformation signals.

Main Results:

  • Confirmed a direct coupling between pore-pressure and deformation during a 10-month slow-slip event.
  • Identified pore pressure fluctuations as indicators of hydro-mechanical processes in the deep seismogenic zone.
  • Showcased the significance of small geodetic disturbances in understanding transient deformations.

Conclusions:

  • Pore-pressure/deformation coupling plays a key role in slow-slip events.
  • Results enhance understanding of the spatial impact of slow-slip events and their role in earthquake cycles.
  • Piezometer measurements along transform faults can help define timescales for slow-slip events and earthquake nucleation.