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Related Concept Videos

Eccentric Loading01:16

Eccentric Loading

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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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Eccentric Axial Loading in a Plane of Symmetry01:16

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Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
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Impact Loading01:19

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Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
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Euler's Formula to Columns: Problem Solving01:23

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Euler's formula is used in structural engineering to determine the buckling load of columns under various conditions. However, when dealing with systems that incorporate both rigid elements and elastic components, such as springs, the analysis requires a finer approach to determine the critical load. The problem described involves two rigid bars connected at a pivot point with a spring attached and a vertical load applied at one end.
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Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
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Spinal loads during cycling on an ergometer.

Antonius Rohlmann1, Thomas Zander1, Friedmar Graichen1

  • 1Julius Wolff Institute, Charitè - Universitätsmedizin Berlin, Berlin, Germany.

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|April 19, 2014
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Summary
This summary is machine-generated.

Cycling with spinal implants may increase spinal loads, especially at higher power levels. Patients with back problems should avoid high-intensity cycling soon after surgery to prevent potential harm.

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Area of Science:

  • Biomechanics
  • Orthopedic Surgery
  • Rehabilitation

Background:

  • Cycling is a popular exercise for fitness.
  • Individuals with back issues or prior spinal surgery often lack guidance on safe cycling practices.
  • Limited data exists on spinal loads experienced during cycling.

Purpose of the Study:

  • To investigate spinal loads during ergometer cycling in patients with lumbar vertebral implants.
  • To assess the impact of varying power levels on spinal forces during cycling.

Main Methods:

  • Utilized telemeterized vertebral body replacements for in vivo measurement of implant loads.
  • Monitored four patients with lumbar compression fractures performing ergometer cycling at different power outputs.
  • Measured maximum resultant force and force range per pedal revolution.

Main Results:

  • Spinal forces, including maximum resultant force and force range, increased with higher cycling power levels.
  • Significant inter-patient and intra-patient variability in measured forces was observed.
  • In two patients, high-power cycling generated greater spinal forces than walking.

Conclusions:

  • Cycling on an ergometer can lead to substantial spinal loads, particularly at higher intensities.
  • Patients with back problems should exercise caution and avoid high-power cycling post-surgery.
  • Further research is needed to establish safe cycling guidelines for this patient population.