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Related Concept Videos

Stress: General Loading Conditions01:15

Stress: General Loading Conditions

To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes.
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

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.
Load along a Single Axis01:29

Load along a Single Axis

In structural engineering, the analysis of beams subjected to varying loads is a critical aspect of understanding the behavior and performance of these structural elements. A common scenario involves a beam subjected to a combination of different load distributions.
Consider a beam of length L subjected to a varying load, which is a combination of parabolic and trapezoidal load distribution along the x-axis. In this case, it is essential to determine the resultant loads, their locations, and...
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
Distributed Loads01:19

Distributed Loads

Distributed loads are a common type of load that engineers and scientists encounter in various practical situations. Distributed loads often refer to a type of load spread over a surface or a structure and can be modeled as continuous force per unit area.
For example, consider a bookshelf filled with books stacked vertically adjacent to each other. The weight of the books is evenly distributed over the length of the shelf. As a result, the pressure at different locations on the surface of the...
Residual Stresses in Bending01:18

Residual Stresses in Bending

In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...

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Related Experiment Video

Updated: May 22, 2026

A Mouse Model of Lumbar Spine Instability
05:28

A Mouse Model of Lumbar Spine Instability

Published on: April 23, 2021

Spinal loads during position changes.

A Rohlmann1, R Petersen, V Schwachmeyer

  • 1Julius Wolff Institute, Charité-Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany. antonius.rohlmann@charite.de

Clinical Biomechanics (Bristol, Avon)
|May 11, 2012
PubMed
Summary
This summary is machine-generated.

Following physiotherapy recommendations significantly reduces spinal loads during body position changes. Proper support, like using armrests, is crucial for minimizing forces on the spine.

Related Experiment Videos

Last Updated: May 22, 2026

A Mouse Model of Lumbar Spine Instability
05:28

A Mouse Model of Lumbar Spine Instability

Published on: April 23, 2021

Area of Science:

  • Biomechanics
  • Spinal Health
  • Orthopedics

Background:

  • Existing recommendations aim to minimize spinal loads during body position changes.
  • The effectiveness of these recommendations in reducing spinal loads has not been empirically verified.

Purpose of the Study:

  • To measure the actual spinal loads experienced by patients when changing body positions.
  • To compare loads when following vs. not following physiotherapy recommendations.

Main Methods:

  • Utilized telemeterized vertebral body replacements in 5 patients with lumbar compression fractures.
  • Measured spinal loads during transitions between lying, sitting, and standing positions.

Main Results:

  • Following recommendations reduced spinal loads compared to uninstructed movements.
  • Unsupported rising from a chair increased loads significantly (380% of standing); armrest use reduced this to 180%.
  • Lateral lying to sitting transitions incurred ~180% of standing loads when following instructions.

Conclusions:

  • Spinal loads during position changes can be substantial.
  • Adherence to physiotherapy instructions and using upper body support (e.g., armrests) effectively minimizes spinal forces.