Measures to prevent instability of steel structures

As most modern buildings choose steel structure for construction, it has become a common structural mode, instability can be divided into two categories, overall instability and local instability. The overall instability is mostly caused by local instability, when the slenderness ratio of the compression part or the bending part exceeds the allowable value, the stability will be lost. However, it is affected by many objective factors, so for the convenience of users to understand and use, the following is a detailed introduction.

1. Defects in relevant materials lead to certain errors in calculation. For example: steel structure or steel material residual stress, initial eccentric force, and initial bending have not been paid enough attention. It will lead to a large error in stability calculation.

2. Support is often neglected by designers or builders, which is also one of the reasons for the overall instability.

3. Load changes and different supporting conditions.

4, in the lifting due to the different position of the lifting point, the force of the truss or grid members may change, resulting in instability.

5. Overturning, collapse or deformation of scaffolding is mostly caused by insufficient connecting rod and no support.

After the completion of steel structure construction, we should not only pay attention to its instability problem, but also pay attention to the fire resistance, corrosion and other properties to solve, do a good job in the usual daily maintenance.