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Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

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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.
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Flexible cables are commonly used in various applications for support and load transmission. Consider a cable fixed at two points and subjected to multiple vertically concentrated loads. Determine the shape of the cable and the tension in each portion of the cable, given the horizontal distances between the loads and supports.
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The analysis of suspension bridges is a complex and critical process that involves multiple factors, including the shape and tension of the main cables. The main cables of suspension bridges are subjected to distributed loads, which result in changes in tensile forces and deformation of the cable. These loads must be carefully considered to ensure that the bridge is safe and capable of supporting the weight of different loads.
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It isn't easy to measure a parameter such as the mean height or the mean weight of a population. So, we draw samples from the population and calculate the mean height or mean weight of the individuals in the sample. This sample data acts as a representative measure of the population parameter. These sample statistics are known as estimates. 
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Overhead power transmission lines rely on cables to carry electricity across large distances. To ensure the stability and functionality of these lines, it is crucial to understand the shape and tension experienced by the cables under the influence of their weight.
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Un modelo de EMG de superficie específico del sujeto para estimar la carga compresiva en L4/L5

Pablo J Dopico1, Audrey Zucker-Levin2, Kunal Singal3

  • 1University of Tennessee Health Science Center-Campbell Clinic Department of Orthopaedic Surgery and Biomedical Engineering, Memphis, TN 38104, USA.

Bioengineering (Basel, Switzerland)
|January 28, 2026
PubMed
Resumen
Este resumen es generado por máquina.

La electromiografía de superficie (sEMG) puede modelar el dolor lumbar (DL) estimando la carga espinal L4/L5 durante el movimiento. Este enfoque personalizado muestra una gran promesa para comprender las causas del DL y desarrollar intervenciones específicas.

Palabras clave:
carga compresivaelectromiografíadolor lumbar

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Área de la Ciencia:

  • Biomecánica
  • Neurociencia
  • Ortopedia

Sus antecedentes:

  • El dolor lumbar (DL) es una afección prevalente que causa una discapacidad y una carga económica significativas.
  • El segmento espinal L4/L5 se ve afectado con frecuencia en el DL debido a su alto papel de soporte de carga.
  • La comprensión actual del DL a menudo carece de una identificación patológica específica.

Objetivo del estudio:

  • Desarrollar y validar un modelo específico del sujeto que estime la carga compresiva en L4/L5 utilizando electromiografía de superficie (sEMG) durante tareas dinámicas.
  • Evaluar la viabilidad de usar sEMG para el análisis biomecánico personalizado en la investigación del dolor lumbar.
  • Comparar las estimaciones de carga derivadas de sEMG con modelos biomecánicos establecidos.

Principales métodos:

  • Ocho voluntarios sanos realizaron una tarea de agacharse para ponerse de pie mientras se registraba la actividad de los músculos erector de la columna, recto abdominal y oblicuo externo utilizando un sistema sEMG inalámbrico.
  • Se creó un modelo sEMG específico del sujeto para estimar la carga compresiva en L4/L5.
  • Las estimaciones del modelo se validaron con un modelo biomecánico AnyBody y datos de la base de datos OrthoLoad.

Principales resultados:

  • Una línea de tendencia indicó una reducción significativa en el error porcentual de la fuerza muscular estimada.
  • El modelo AnyBody arrojó valores de impulso significativamente más bajos en comparación con el modelo sEMG específico del sujeto (p = 0.007).
  • A pesar de la alta variabilidad, los valores de carga del modelo sEMG generalmente se alinearon con los hallazgos de la literatura.

Conclusiones:

  • El modelado sEMG específico del sujeto ofrece un método viable para estimar la carga espinal L4/L5 durante actividades dinámicas.
  • Las variaciones observadas entre los modelos sEMG y AnyBody resaltan la necesidad de un mayor desarrollo y validación de las mediciones de carga personalizadas.
  • Este enfoque tiene el potencial de avanzar en la comprensión y el manejo del dolor lumbar.