Query Regarding Application of Floor Loading in STAAD

Question

Hi, 
 I am analyzing G+2 Building structure. I have applied Floor load by Grouping Method ( Without the modelling of the Plate ). I am getting heavy reinforcement in beam. Kindly help me to find out the reason behind this. 
 Also, Is this the correct method to apply Floor Load ? 
 Input Data 
 Slab thickness 150mm 
 Concrete Density - 25KN/m^2 
 Live Load Considered - 2.25 KN/m^2 
 Total Applied Load = 25 x0.15 + 2.25 = 6KN/m^2 
 
 File is attached Below for your reference. 
 7462.Structure1.std

Abhisek M · Answer

You have applied the floor load correctly in your model. The one point I would like to highlight here that the selfweight of the slab should be placed under dead load condition. 
 Regarding high reinforcement, canb you please point out a member? Consider the span and load 300mm depth seems a bit low. You can try with 350 to 400mm depth which wioll give you lower reinforcement.