Why can't the stairs go through the garage?

There are many reasons. First of all, after the introduction of the new fire code, including the previous fire code, the division of fire zones is different. It is possible that it is enough to borrow one elevator for two fire zones, so only one through elevator can get off the garage. Two movies are too wasteful.

Then the column network. Parking is economical, and the column network distribution should be reasonable. The 7.8-meter column network is evenly distributed, and three cars are parked between two columns, which is the most economical. Sometimes the traffic core will affect the arrangement of parking spaces, so some elevators will not fall.

Also, you are a shear wall structure system, so the shear wall should land directly, so it should fall under the garage, and the shear wall can't be opened uniformly. Falling will cause uneven distribution of underground garages and walls, so it may cause your exit to go outside. I hope it will help you! Of course, some designers are unwilling to use their brains, so it is unreasonable!