problem description
title="CST Sample Problem (Logan #7.11a, p.309)" nodes=5 elements=4

nodes
1 	x=0 	y=0	constraint=pin
2	x=500	y=0	constraint=free		force=point
3	x=500	y=250	constraint=pin
4	x=0	y=250	constraint=pin
5	x=250	y=125	constraint=free

CSTPlaneStress elements
1	nodes=[1,2,5]	material=steel
2	nodes=[2,3,5]
3	nodes=[3,4,5]
4	nodes=[1,5,4]

material properties
steel	E=210e6 nu=0.30 t=5

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

forces
point	fy=-40000*cos(30*3.14159/180.0) fx=40000*sin(30*3.14159/180.0)

end