# Shear stress eqn

1. Jul 26, 2006

### teng125

http://www.savefiles.net/d/ieiwoixnjfw.html

Can anybody pls write for me the shear stress eqn using singularities or heaviside function in which i have attach the in the file above

pls help

thanx

2. Jul 26, 2006

### Cyrus

This is the homework help, not the do your homework forum. :grumpy:

3. Jul 27, 2006

### Pyrrhus

Looks like standard procedure to me?, on what exactly are you stuck?

4. Jul 28, 2006

### teng125

the equation for the middle part where the joint forces between the upper and lower force.Should i write 2q<x-l>^0 or any others??

5. Jul 28, 2006

### Meson

Taking downward direction as a positive direction, the load density function should be

$$q(x)=q_{0}-q_{0}(x-l)^0-q_{0}(x-l)^0=q_{0}-2q_{0}(x-l)^0$$

Note that the $$q_{0}$$ is contributed by the upper distributed force, the first $$q_{0}(x-l)^0$$ is to diminish the effect of $$q_{0}$$ at position along the beam $$x=l$$ while the second $$q_{0}(x-l)^0$$ is the lower distributed force that acting in an upward direction, which means the negative direction here by convention.

Then, proceed to find $$V(x)$$ and $$M(x)$$. Finally, draw the shear and moment diagrams.

Last edited: Jul 28, 2006
6. Jul 28, 2006

### teng125

ok.........thanx