Understanding Reaction Forces in Pure Bending for Structural Resistance

  • Thread starter Thread starter chetzread
  • Start date Start date
  • Tags Tags
    Bending Pure
Click For Summary
SUMMARY

The discussion centers on understanding reaction forces in pure bending scenarios for structural resistance. Participants clarify that to resist bending, a longitudinal normal force acts against the applied transverse load, while the author incorrectly refers to this as a longitudinal shear force. The correct setup involves a beam fixed at one end with a transverse load applied at the opposite end, necessitating both an upward force and a torque at the fixed end to maintain equilibrium. The torque is transmitted through longitudinal shear forces, which are essential for balancing the moment caused by the load.

PREREQUISITES
  • Understanding of structural mechanics principles
  • Familiarity with beam theory and loading conditions
  • Knowledge of shear and normal forces in structural analysis
  • Ability to interpret free body diagrams
NEXT STEPS
  • Study the principles of beam deflection and bending moments
  • Learn about the relationship between shear forces and bending moments in beams
  • Explore fixed beam analysis using software like SAP2000 or ANSYS
  • Investigate the effects of different loading conditions on beam stability
USEFUL FOR

Structural engineers, civil engineering students, and professionals involved in analyzing beam behavior under various loading conditions will benefit from this discussion.

chetzread
Messages
798
Reaction score
1

Homework Statement


to resist the bending, there must be reaction force(blue) act against the applied force(red), the reaction force that resist bending is the longitidunal normal force , right?
why the author stated it as longitidunal shear force, is it wrong?

Homework Equations

The Attempt at a Solution


longitidunal shear force is the green colour arrow, right? how could the force resist the bending?
 

Attachments

  • 348.jpg
    348.jpg
    40.3 KB · Views: 394
  • 349.png
    349.png
    1.8 KB · Views: 415
Physics news on Phys.org
chetzread said:

Homework Statement


to resist the bending, there must be reaction force(blue) act against the applied force(red), the reaction force that resist bending is the longitidunal normal force , right?
why the author stated it as longitidunal shear force, is it wrong?

Homework Equations

The Attempt at a Solution


longitidunal shear force is the green colour arrow, right? how could the force resist the bending?
Your own diagram is inaccurate in several ways.
The set-up is a beam fixed at one end, with a transverse load applied at the other, not in the middle. There is no source of a force to provide the support you show in blue.
You do not show any forces where the beam is fixed. These forces will consist of a vertically upward force to balance the load, plus a torque to balance the moment of the load. This torque is transmitted in the form of the longitudinal shear forces.
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
2K
Replies
9
Views
2K
  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 2 ·
Replies
2
Views
3K
Replies
3
Views
3K