Why support for diving board case is assume as pin/roll?

  • Thread starter Thread starter enotyphoon
  • Start date Start date
  • Tags Tags
    Board Support
AI Thread Summary
The discussion centers on the classification of a diving board's support as either pin or fixed. The original poster questions why a diving board, which is bolted vertically to a base, is assumed to have pin support instead of being treated as fixed, given that the bolts resist rotation. Participants clarify that while the board may appear rigid, for educational purposes, it is often modeled as a pin to simplify calculations of reaction forces and spring compression. The conversation emphasizes the importance of context in modeling, suggesting that the intended audience and their level of understanding influence the choice of support type. Ultimately, the distinction between pin and fixed support in this scenario hinges on the assumptions made for analysis.
enotyphoon
Messages
17
Reaction score
0
Sorry for silly question, but have been wondering.
Diving board it is bolted to the ground(base platform) (vertically), why not assume it as fix. the way bolt is secured is same direction as the load, hence it is not easy/resist to rotate up and down like pin or hinge. so there is moment. Isn't?
 
Engineering news on Phys.org
Are you comparing a hypothetical diving board with a real one? I can't really follow your question. Try explaining what is confusing you more fully.
 
Capture.png

http://[url=http://postimg.org/image/fqof29xxj/][PLAIN]http://s15.postimg.org/fqof29xxj/Capture.jpg I'm pretty sure the end of beam(bolted) will be considered as pin(from many example I have seen).
however 2 bolts is bolted vertically (not sideway like huge pin), that mean it the beam to go up and down as pin. So shouldn't it be fix?

EDIT: Pics source from google
 
Last edited by a moderator:
From your second picture, it is certainly bolted to something. Is that part rigidly attached to the base?
 
I would say it is just bolted by two fastener to base, and assuming the body is rigid when try to find the reaction force.
 
One of the pictures you have didn't come through properly. Did it also have springs?
 
Nevermind, ignore the picture that didn't come through properly. Only 1 pics.
 
So. If I wanted to make a homework problem for high school students, or anyone who hasn't learned about beam deflection, I would model it with a pin. They could calculate reaction forces and maybe spring compression, all while assuming the beam was a rigid body.
After learning about beam deflection, I would model it rigidly attached.
Who is the intended audience for the model that confused you?
 
yes to find reaction force, we would assume the beam is rigid at first.
However my work colleague ask me why we would use pin support and not fixed support at the end of beam? Because from the pics, the bolt prevent the beam from rotate(unlike pin which easy to rotate) which would match with the characteristic of fix support. so that is the thing that I need to justify.
 
  • #10
What is the context? Who are you modeling this for?
 

Similar threads

Diving board with two supports and torque due to diver
Replies
2
Views
7K
Dive effect of sliding objects
Replies
4
Views
3K
Complex System Boundary Conditions
Replies
4
Views
2K
Hypervelocity cannons: Why not centrifugal?
Replies
43
Views
6K
Are My Free Body Diagrams Correct?
Replies
6
Views
34K
Requesting suggestions for languages, libraries, and architectures for parallel (and sometimes non parallel) numerical and scientific computations
Replies
8
Views
4K
What if Gravity could be controlled?
Replies
1
Views
4K
Model Pulley: Understanding System Physics
Replies
27
Views
10K
Derivation of Moment of Inertia: Why is centripetal acceleration ignored?
Replies
17
Views
7K
Urgent Dynamics and Mechanics Help: Difficult Energy, Work, and Power Questions
Replies
1
Views
3K

Hot Threads

Recent Insights

Back
Top