I have modelled and run an underground (with bi-linear soil springs) system in Ceasar v4.5. After that, I converted it to Ceasar v5.2 (without changing anything and the same units file (mm)) and ran it again. For the operating, sustained and expansion load cases all results (stresses and restrain loads) are exactly similar as in v4.5, but for the hydrotest case the restraint loads on the soil springs are significantly down, almost zero.

I know that an soil springs take the weight of the pipe and its content and therefore don't show any restraint loads when in equilibrium position. But when using the 'water filled weight' for the hydrotest case the restraint loads on the springs usually increase in Ceasar 4.5, does anyone know why this does not happen in version 5.2?