You can add a beam with a span of 4 or 5 meters between 5 and 2 meters. At this time, the plate thickness is 80mm, and the beam is about 200x300mm. Without beams, the thickness of the plate is about 120mm to 140mm.
Generally speaking, it is normal for a house with a central beam in the living room to have a large housing area, and some have a central beam between the living room and the dining room. This is the pillar of the whole house. Generally speaking, it is used for bearing.