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Related Concept Videos

Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

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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...
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Beams with Symmetric Loadings01:15

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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.
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Internal Loadings in Structural Members: Problem Solving01:28

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When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
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Machines: Problem Solving II01:30

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Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
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Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

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Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
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Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

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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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Related Experiment Video

Updated: Mar 8, 2026

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
08:19

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Carrying asymmetric loads during stair negotiation.

Junsig Wang1, Jason Gillette1

  • 1Department of Kinesiology, Iowa State University, Ames, IA, USA.

Gait & Posture
|January 24, 2017
PubMed
Summary

Carrying heavy loads asymmetrically significantly increases stress on the spine and lower body during stair negotiation. Symmetric loading is recommended to reduce joint moments and potential injury risk.

Keywords:
Asymmetric loadGaitJoint momentL5S1Load carriageLow back

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Area of Science:

  • Biomechanics
  • Ergonomics
  • Kinesiology

Background:

  • Daily activities often involve carrying loads unilaterally.
  • Stair negotiation with asymmetric loads can increase biomechanical stress on the low back and lower extremities.

Purpose of the Study:

  • To investigate the impact of symmetric versus asymmetric loading on L5/S1 (lumbar spine) and lower extremity joint moments during stair negotiation.
  • To compare frontal plane moments under various load conditions.

Main Methods:

  • Twenty-two college students completed stair ascent and descent on a three-step staircase.
  • Five loading conditions were tested: no load, 10% and 20% body weight (BW) unilateral, and 10% and 20% BW bilateral.
  • Kinematic and kinetic data were collected using video cameras and force platforms, analyzed with inverse dynamics.

Main Results:

  • A 20% BW unilateral load significantly elevated peak L5/S1 lateral bending moments.
  • Higher hip abduction and external knee varus moments were observed with 20% BW unilateral loading.
  • Asymmetric loading conditions generally resulted in greater frontal plane joint moments compared to symmetric loading.

Conclusions:

  • Carrying asymmetric loads, especially at higher percentages of body weight (20% BW), imposes greater demands on the spine and lower extremities during stair negotiation.
  • Symmetric loading strategies are advisable to mitigate increased frontal joint moments and potentially reduce injury risk.