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@ali7988 hameed.. I think you want to apply partition wall load on floor slab, for this purpose you can simply draw a null/negligible frame element and apply load over it.

membrane is capable of taking tensile stresses only like our skin or tarpal (urdu word). Word slab used in structural engineering cant be membrane. shall is capable of taking shear and moment. Any thing that can take shear or moment can also take direct tension or compression. plate is shell/slab loaded in its plane like shear wall.

another thing. if you put the same modifiers for every thing like walls, columns, beams, floor etc..so the reduction will be uniform it will not affect the results. but if you make something stiffer and another less stiffer so you basically are creating differences in stiffness so is the difference in the moment that will goto these elements. like in this example i have applied beams = 0.35,0.35,0.35 (j,m22,m33) cols = 0.7,0.7 (m11,m22) slab = 0.25,0.25,0.25 (m11,m12,m22) walls = 0.7,0.7(m11,m22)