Maximum bending Moment and Maximum Shear Stress Question

Click For Summary
SUMMARY

The maximum bending moment and maximum shear stress are determined using absolute values in structural analysis. In the context of a bending moment diagram, a value of -400 kNm and +300 kNm indicates that 400 kNm is the maximum bending moment, as it represents the largest magnitude regardless of sign. This principle also applies to shear forces, where the larger magnitude is used to identify maximum shear stress, while the sign indicates the direction of curvature in the beam.

PREREQUISITES
  • Understanding of bending moment diagrams
  • Knowledge of shear force calculations
  • Familiarity with beam curvature concepts
  • Basic principles of structural engineering
NEXT STEPS
  • Study the principles of beam deflection and curvature
  • Learn about shear force and bending moment relationships in beams
  • Explore advanced topics in structural analysis using software like SAP2000
  • Review case studies on beam design under varying loads
USEFUL FOR

Structural engineers, civil engineering students, and professionals involved in beam design and analysis will benefit from this discussion.

coolguy16
Messages
15
Reaction score
0
Is the maximum bending moment and maximum shear stress an absolute value? For example, when drawing out a bending moment diagram say if I get -400 kNm at one point and 300 kNm at a different point. If these values are the maximum/minimum points on my diagram would 400 kNm be considered as a maximum bending moment? Does the same method apply for shear force also?

Thanks
 
Physics news on Phys.org
You wouldn't want to design a uniform beam for +300 moment when you have a -400 moment, so in that sense, use the absolute value for the max. But plus and minus moments tell you about the curvature of the beam (concave or convex) so you can't just ignore the signage . Same for shear in terms of using the larger magnitude if you are looking for the max
 
  • Like
Likes   Reactions: coolguy16
Ok perfect. Thanks so much.
 

Similar threads

Undergrad Is shear stress at the pipe wall the same for turbulent and laminar flows?
  • · Replies 31 ·
2
Replies
31
Views
3K
Undergrad Calculating Combined Loading Stress: Neutral Axis and Bending Moment at Point A
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Shear force and bending moments graph
  • · Replies 25 ·
Replies
25
Views
3K
Loader Boom maximum bending moment
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Stresses Caused By Deformation For Bending
  • · Replies 6 ·
Replies
6
Views
1K
Question about torsional shear stress
  • · Replies 5 ·
Replies
5
Views
2K
Bending Stress and Shear Stress
  • · Replies 2 ·
Replies
2
Views
3K
Engineering Distance is a problem -- find shear force and bending moment diagram
  • · Replies 2 ·
Replies
2
Views
2K
Engineering Shear stress problem: What decides the sign of Tau_V?
  • · Replies 2 ·
Replies
2
Views
2K
Engineering Cantilever and encastré beams: bending moment and shear force
  • · Replies 2 ·
Replies
2
Views
3K