It’s not the first floor that holds the weight, it’s the pillars that support the entire building, along with the foundations in the ground. To make the building strong enough to withstand the entire thing, it’s made up of different types of material throughout . For example, the most common type of pillar is using strengthened concrete, which is just basically steel bars inside a concrete block. This is also why the foundation of a building is super important, otherwise it might collapse on its own weight.
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