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Videos de Conceptos Relacionados

Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

381
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
381
Deformation of a Beam under Transverse Loading01:15

Deformation of a Beam under Transverse Loading

678
Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
678
Shearing Stresses in a Beam: Problem Solving01:14

Shearing Stresses in a Beam: Problem Solving

589
A cantilever beam with a rectangular cross-section under distributed and point loads experiences shearing stresses. The analysis begins by identifying the loads acting on the beam. Then, the reactions at the beam's fixed end are calculated using equilibrium equations. The vertical reaction is a combination of the distributed and point loads, while the moment reaction is the sum of their moments. The shear force distribution along the beam, resulting from these loads, is established by creating...
589
Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

372
The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
372
Impact Loading on a Cantilever Beam01:13

Impact Loading on a Cantilever Beam

812
The analysis of a cantilever beam with a circular cross-section subjected to impact loading at its free end illustrates the conversion of potential energy from a dropped object into kinetic energy, which is then absorbed by the beam as strain energy. This process is crucial for understanding how materials behave under dynamic loads, which is important in fields such as construction and aerospace.
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
812
Elastic Curve from the Load Distribution01:16

Elastic Curve from the Load Distribution

474
The structural behavior of beams under distributed loads is critical for engineering analysis, which focuses on predicting how beams bend and react under such conditions. Different types of beams (e.g., cantilever, supported, or overhanging) behave differently under distributed load conditions.
For all beams, the analysis of the beam's reaction to distributed loads begins by understanding the relationship between a beam's load and the resulting shear forces and bending moments. Initially, this...
474

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Video Experimental Relacionado

Updated: Jan 9, 2026

Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes
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Simulación numérica del comportamiento de vigas postensadas bajo cargas de impulso de fuerza

Anna Jancy1, Adam Stolarski1

  • 1Faculty of Civil Engineering and Geodesy, Military University of Technology, 2 gen. Sylwestra Kaliskiego Street, 00-908 Warsaw, Poland.

Materials (Basel, Switzerland)
|December 11, 2025
PubMed
Resumen

Las simulaciones numéricas revelan que las vigas postensadas exhiben una capacidad de carga dinámica reducida bajo cargas de impulso de fuerza constante pero una capacidad significativamente mejorada bajo cargas variables en el tiempo, influenciada por la excentricidad del pretensado.

Palabras clave:
análisis de daño en concretoanálisis dinámicoanálisis del método de elementos finitoscarga de impulso de fuerzavigas postensadas

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Área de la Ciencia:

  • Ingeniería Estructural
  • Mecánica Computacional
  • Ciencia de Materiales

Sus antecedentes:

  • Las vigas postensadas son elementos estructurales críticos.
  • Comprender su comportamiento dinámico bajo cargas de impulso es esencial para la seguridad.
  • La investigación previa se ha centrado en condiciones de carga estáticas o dinámicas diferentes.

Objetivo del estudio:

  • Simular y analizar numéricamente el comportamiento dinámico de vigas postensadas bajo dos tipos distintos de cargas de impulso.
  • Investigar la influencia de la excentricidad del pretensado en la capacidad de carga dinámica.
  • Comparar las capacidades de carga dinámica y estática.

Principales métodos:

  • Se utilizó el programa Abaqus para simulaciones numéricas detalladas.
  • Se emplearon modelos de plasticidad de daño del concreto y Johnson-Cook para el comportamiento del material.
  • Se calibraron modelos dinámicos utilizando datos de análisis experimentales y estáticos.
  • Se resolvieron las ecuaciones de equilibrio dinámico utilizando un procedimiento explícito.

Principales resultados:

  • Las cargas de impulso de fuerza constante resultaron en una disminución de ~5% en la capacidad de carga dinámica en comparación con las pruebas estáticas.
  • Las cargas de impulso variables en el tiempo a corto plazo aumentaron significativamente la capacidad de carga dinámica.
  • Una mayor excentricidad de pretensado condujo a una mayor capacidad de carga dinámica (211% de la estática).

Conclusiones:

  • El tipo de carga de impulso afecta críticamente la capacidad de carga dinámica de las vigas postensadas.
  • Las cargas de impulso variables en el tiempo pueden mejorar sustancialmente el rendimiento estructural más allá de las predicciones estáticas.
  • La excentricidad del pretensado es un parámetro clave que influye en la respuesta y capacidad dinámicas.