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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
Thermal Stress01:09

Thermal Stress

If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.
Stress-Strain Diagram - Brittle Materials01:24

Stress-Strain Diagram - Brittle Materials

Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...

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Fluid-cell Raman Spectroscopy for operando Studies of Reaction and Transport Phenomena during Silicate Glass Corrosion
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A Microplane Constitutive Model for SFRC Subjected to High Temperatures.

Marianela Ripani1,2,3, Sonia Vrech1,4, Antonio Caggiano5

  • 1Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires C1425FQB, Argentina.

Materials (Basel, Switzerland)
|June 12, 2026
PubMed
Summary

High temperatures degrade concrete structures, but steel fiber-reinforced concrete (SFRC) offers improved fire resistance. This study develops a computational model to predict SFRC

Keywords:
SFRCconcretehigh temperaturemicroplanesmixture theorysteel fiberthermodynamic consistency

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Computational Mechanics

Background:

  • High temperatures significantly degrade concrete structures, affecting material properties like strength and stiffness.
  • Fiber reinforcement enhances concrete's fire resistance and fracture energy, necessitating advanced predictive models.
  • Existing models often lack comprehensive temperature-dependent behavior for fiber-reinforced concrete.

Purpose of the Study:

  • To develop a thermodynamically consistent, temperature-dependent microplane material model for steel fiber-reinforced concrete (SFRC).
  • To simulate the mechanical behavior of preheated SFRC under residual conditions.
  • To analyze the influence of high temperatures on material response and failure mechanisms.

Main Methods:

  • Development of a microplane material model incorporating a smeared crack approach.
  • Simulation of preheated steel fiber-reinforced concrete under varying temperature loads.
  • Evaluation of stress-crack opening displacement and stress-crack slip curves.
  • Numerical analysis of the acoustic tensor to predict discontinuous bifurcation and failure orientation.

Main Results:

  • The model accurately predicts the temperature-dependent mechanical behavior of SFRC.
  • High temperatures lead to degradation in strength and stiffness, with increased porosity.
  • Failure analysis identified critical orientations for bifurcation at different temperature levels.

Conclusions:

  • The developed microplane model provides a robust tool for predicting the fire performance of SFRC structures.
  • Understanding temperature effects on material properties and failure is crucial for structural integrity.
  • The study contributes to the advancement of computational modeling for fire-resistant concrete materials.