Re-using a preload step

Hi,

Take a bolted structure with fasteners preloaded and then subjected to many loadcases.

Contact interfaces making the problem non-linear. Using SPA. No changes to geometry and mesh re-used.

The first part of the calculation for each loadcase is identical.

Is there a way of re-using the solution to pass1?

This would better than halve the time. Studies I have just completed are 4 hours elapsed each.

Thanks

Charles