Why should the eaves of ancient buildings in China be raised?

The eaves of ancient buildings in China are bent upward, and most of them rest on mountains or temples. At first, we should improve the strength of corner beams and cornice trusses inclined at 45 degrees with cornice trusses (wind bottles); Because the mountain and the horizontal cornice truss overlap each other, their diameter strength is reduced to about 2/5. If you want to insert the corner beam into the other leg, it will overlap each other, and the strength of the overlap will decrease continuously, and finally it will not be able to effectively support the weight of the tiles on the cornice. Therefore, in order to improve the strength of corner beams and cornice trusses, corner beams are directly cut and overlapped with mountain and horizontal cornice trusses. This makes the corner beam must be higher than the cornice truss, so during this period, logs are added to realize the gradual transition from corner beam to cornice truss on the mountain surface and horizontal plane, and it is constantly explored, optimized and beautified in the practice process, and gradually evolved into a beautiful upward curve we see.