# Homework Help: Axial deformation problem

1. Nov 22, 2013

### princejan7

---Quote---
*1. The problem statement, all variables and given/known data*

http://postimg.org/image/yrbu7a0vb/

*2. Relevant equations*

e(elongation of a member) = (Force * Length)/(Area * Young's Modulus)

*3. The attempt at a solution*

Is the force P distributed so that the force on each bar is P/3 so that F2 would be (14/3)?

How do I use that value and the elongation equation to find the width of the gap?
I'm not sure what the relationship should be

thanks

2. Nov 22, 2013

### Staff: Mentor

In (a), the centre column just avoids contact with the beam, leaving the two outer columns to support the entire force P.

3. Nov 22, 2013

### haruspex

In part a)? No. When the gap is only just closed, there is not yet any force on the central pillar.
This is a question about bending moments and beam deflection. I don't see where elongation comes in before part b).

4. Nov 22, 2013

### Staff: Mentor

I don't think it is. I read it as the rigid beam does not bend.

5. Nov 23, 2013

### haruspex

You're right - sorry. I completely misread it.