Question

Is there any option where we can apply a prescribed support displacement at a spring support joint? Some support joints in my model are restrained by springs, and I cannot apply perset (deflection) at the joints. How can I solve this problem?

 

Answer

Yes, users can use the Joint Deflections feature in Precede as shown below:

Support displacement (JOINT PERSET) by definition must have a fixed boundary condition for the analysis to work. (Think F=k*x where the displacement DOF is defined). You cannot have a combination of a spring support and a support displacement because the support DOF must be fixed. 

The correct input for this boundary condition is a "Fixed" boundary condition (111111) on the joint line, a support displacement in the translational Z DOF, and spring stiffnesses defined for all other DOF's (DX,DY,RX,RY,RZ). 

JOINT 0002   0.000  5.000  0.000                      111111
JOINT 0002                    1.                      PERSET TEST   TEST
JOINT 0002   1000.1000.00       1000.001000.001000.00 ELASTI

 

See Also

Details as described in SACS IV manual, Section 2.9.1.5 Joint Specified Displacements