Stair Why Design For Singular
In the normative provisions, stairs every order ≥ 3, ≤ 18 sections, stair level calculation in theory should be the height divided by the height of each stair.
(Adds: storey, each different, generally for example houses is a 2.8~3.0-meter level, often in public buildings is a 3.6~4.5-meter level.
The height of steps designed in accordance with ergonomic decisions, to make people lift will not be too tired, you will not be so high that people noticed wrestling, for the old building design has to be much shorter, so that the elderly not too tired, or using ramps and so on. ）
Closer to home:
1, according to the most commonly used storey residential 3.0M/the most common stair height 0.165m ≈ 18, or 18, but stairs designed to save space in the building, often designed as double run (which is divided into two sections, there's a platform shift). That is, each series is level 9.
2, in the same way, public buildings most commonly used stair height 0.165m 3.6m/≈ 22, that is, each level 11.
3, General Designer of stairs as much as possible when the total number of segments is even more convenient symmetry, is odd is how much do I want to look at the total number of segments.
And that with China's traditional culture. In ancient China the odd (odd) as Yang, and even numbers (even number) as a negative number. Days for the Yang and yin. Singular considered auspicious, so the number of steps of the stairs are usually singular, consistent with people's habits, while the first step and the last step the feet, will feel natural.