problem description
title="Isoparametric Sample Problem (EDSEP example #8)" nodes=9 elements=2

nodes
1 x=0     y=5     constraint=free
2 x=50 	          			force=point1
3 x=100
4 x=0	  y=0	  constraint=pin	
5 x=50	          constraint=free	force=point2
6 x=100	 	  constraint=roller	
7 x=0	  y=-5    constraint=free
8 x=50					force=point1
9 x=100	 

iso2d_PlaneStress elements
1 nodes=[2,1,7,8,0,4,0,5,0] material=steel
2 nodes=[3,2,8,9,0,5,0,6,0] 

material properties
steel e=3e5 nu=0.2 t=1.0

constraints
pin tx=c ty=c
roller tx=u ty=c
free tx=u ty=u

forces
point1 fy=-100
point2 fy=-300

end
