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Post-tensioned slabs. Instantaneous and differed post-tensioned losses

The possibility to separately define the reinforcement loss for instantaneous and differed post-tensioned slabs has been added. Therefore, when analysing, two post-tension loadcases will appear: one with instantaneous losses and another with total losses (instantaneous + differed). A new combination will also appear in the combinations in which the initial post-tension loadcase will act with the self-weight of the structure, so the post-tensioning without any loading, one of the most critical steps when tensioning the tendons of the floor slab, can be controlled.