agregar ejemplo timoskenko

```matlab
clear all, close all

L = 1 ; % m
h = 0.2 ; % m
b = 0.1 ; % m
P = 1e4;

E = 200e9;
nu = 0.3;
G = E/(2*(1+nu));
x = 0:.05:L;
A = b*h ;
I = b*h^3/12;
k = 5/6;

v_EB = P*x.^2 .* (x-3*L) / (6*E*I);

v_T = v_EB + P*x/(k*A*G) ;

figure
hold on, grid on

plot(x,v_EB,'b')
plot(x,v_T,'r')
```