Cables are multi-strand assemblies and so the distribution of stress among all the strands is very complex. Cable manufacturers specify a safe load for using a cable, which is in terms of force as well as a minimum breaking strength, also in terms of force. Refer to the table on this page.
When you use a spring element in Workbench, you can insert a Probe and recover the force in the spring once the system is solved.
Jason suggested a LINK180. [Edit: see my next post for images from Jason's example]
One advantage of using a LINK180 is that by specifying the cross-sectional area of the link and the material (which has a density property) for the link, your simulation can automatically include the weight of the cable. If you use the spring element and you want to include the weight of the cable, you will need to add a point mass to the elevator car and calculate the weight by using the length and multiplying by the last column in the table for Wire Rope. Note that the area you specify must be calculated from the last column in the table by dividing by the material density. That way ANSYS will calculate the same value for the same length that you would calculate by hand.
The LINK180 also has a FORCE output which is shown in my next note.
Attached is an ANSYS 18.2 archive of a small model to figure out how to get a LINK180 to work. It needs a material and cross-sectional area defined.