The calculation formula for steel structure stairs is 2h b = 600 plus or minus 20. This formula is based on ergonomic principles. Usually in adults, the step length is about 750. Through the influence of the height on the stairs, the step length becomes shorter and the height becomes higher. Higher, shorter step length. Therefore, the height influence factor can be multiplied by 2.
Generally there are the following sizes: 300X150, 280X160, 260X170, 250X175, etc. The step height of the public stairs is 160-170mm. The ordinary cement base of the stairs in the house is at such a standard, and 160mm is a more comfortable height.
1. The horizontal projection area of the stairs: the cast-in-place concrete stairs are calculated based on the horizontal projection area according to the design diagram size. The stairwell with a width less than 500mm is not deducted, and the part that extends into the wall is not counted.
2. The horizontal projection area of the stairs: including steps, inclined beams, resting platforms, platform beams, and beams connecting the stairs and the floor (the stairs and the floor are divided by the outer side of the stair beam).
3. When the integral staircase is connected with the cast-in-place floor slab without ladder beams, the last step edge of the staircase plus 300mm is the boundary. Stair volume = step volume. Stair slab volume. The formula for the area of triangles = (1/2) * bottom * height.
First, confirm how many turns we need from the next floor to the second floor. If you need to make a turn, then the company needs to pass a resting plane, and then analyze and confirm the specific height of the rest platform from the ground, use the ink line to lay the foundation position, and measure the starting point What is the length of the rest platform, and then calculate the series according to the size of the first point, and the calculation method of the series from the rest platform to the entrance of the second floor is the same as above.
Since there are two turns of the stairs, two resting platforms are required. The same calculation method is used to ensure the height of the first resting platform and confirm the height of the second platform. Steel structure stairs are famous for their few fulcrums, high load-bearing, diverse shapes, and high technical content. It is not easy to be affected by columns, floors, and other structures, and it is strong and firm. It is not easy to be affected by columns, floors, and other structures and has a solid foundation.
The steel plate of the welding stairs is made by debugging and accurate welding, so the treads are at the same level before and after loading. All materials and accessories are horizontal and vertical. There are various materials for welding stairs. Square pipe, round pipe, angle iron, channel steel, I-beam can be used. Therefore, the shapes are more diverse.