For support displacements, cnodes are to be used. However, we have to specify displacements only in the direction of the restraint at Cnode point. For example, if the support is x restraint, give displacement in x direction only leaving other displacments blank. Similarly, if the support is spring hanger, give displacement only for y direction at c node.
I have checked and found that even if uou give displacements at other directions, caesar ignores
those displacements and takes displacenment only in restraint directions.
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K. R. SRINIVASAN