Purpose: Defines use of slab for stiffness in determining permanent deformations in LRFD projects.
--> Given in girder input
According to LRFD Section 6.10.4.2.1 the slab can be used for section properties when determining permanent deformation stresses if slab stress is compression or slab tension stress does not exceed twice the concrete modulus. Use of this condition, however, overrides this assumption.