Attention should be paid to drainage problems in space frame construction design

For buildings, drainage is very important. If water accumulates on the building, it will undoubtedly increase the pressure on the underlying building. Therefore, the drainage design of the building is very important. For example, the design of traditional house tiles takes drainage into consideration, so the space frame How to design the drainage structure of structural buildings?　　

The roof area of ​​the grid structure is relatively large, and the height of the slope in the middle of the roof is also relatively large, and the roof drainage problem is very necessary. The space frame roof drainage adopts the following methods:
1. Adding small uprights to the upper chord node 　　

The method of adding small uprights to the upper chord node to form a drainage slope is more flexible. As long as the height of the small uprights is changed, a double-slope, four-slope or other complex multi-slope drainage system can be formed. The structure of the small column is relatively simple, and it is one of the most popular methods for finding slopes. When using this method, for areas with seismic requirements, such as the slope finding method with small columns, the small columns should be checked for earthquake resistance and stability.

2. Arching of the entire space frame 　　

The method of arching the entire space frame to form the roof drainage slope is to keep the upper and lower chords of the space frame parallel, and only raise the entire space frame in the middle of the span. Suitable for double-slope drainage. This approach has good seismic performance.
3. Variable height of the space frame 　　

In order to form the roof drainage slope, the space frame can be used to change the height, that is, the height of the grid is increased in the middle of the span, so that the upper chord forms a slope, and the lower chord is still parallel to the ground. Due to the increase in the mid-span height, the internal force of the upper and lower chords of the space frame can be reduced, so that the internal force of the grid tends to be uniform, but the types of upper chords and webs are increased, which brings certain difficulties to the production of the grid. This approach will also improve the seismic performance of the space frame.
　　
In order to ensure that no water enters or collects on the top of the building, the drainage structure design of the building must be fully considered at the beginning of the space frame structure design.