/*
                                     O                                        
                                     +                                        
                                     +                                        
                O                    +                     O                  
                 +                   +                    +                   
                  +                  +                  ++                    
                   ++                +                 +                      
                     +               +                +                       
                      +              +               +                        
                       +             +              +                         
                        +            +            ++                          
O+                       +           +           +                        +O  
  ++++                    ++         +          +                     ++++    
      ++++                  +        +         +                  ++++        
          +++                +       +       ++               ++++            
             ++++             +      +      +             ++++                
                 ++++          +     +     +           +++                    
                     ++++       +    +    +        ++++                       
                         +++     ++  +   +     ++++                           
                            ++++   + + ++  ++++                               
                                +++++++++++                                   
                                    +O+                                       
*/

# define DTR	3.14159/180.0

problem description
title="Truss Sample Problem (Logan #3.35, p.121)" nodes=6 elements=5

nodes
1 x=0	y=0			        constraint=free	    force=point_load
2 x=-10*cos(30*DTR) y=10*sin(30*DTR)	constraint=pin
3 x=-10*cos(60*DTR) y=10*sin(60*DTR)	
4 x=0		    y=10		
5 x=10*cos(60*DTR)  y=10*sin(60*DTR)
6 x=10*cos(30*DTR)  y=10*sin(30*DTR)

truss elements
1 nodes=[2,1]	material=bar1
2 nodes=[3,1]	
3 nodes=[4,1] 	material=bar2
4 nodes=[5,1]	material=bar1
5 nodes=[6,1]

material properties
bar1 A=1 E=10e6
bar2 A=2 E=10e6

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

forces
point_load Fy=-2000

end