Compared with concrete, steel structure engineering has relatively many advantages, so steel structure is widely used. Instability refers to the loss of stability when the bearing capacity of the steel structure reaches the limit state. There are many accidents caused by the instability of steel structures in engineering. In order to fundamentally control the occurrence of steel structure instability accidents, it is first necessary to understand the causes of steel structure instability.
Instability types and characteristics of steel structure engineering:
Generally speaking, the instability of steel structure engineering can be roughly divided into overall and local instability. In nature, the instability of steel structure engineering is divided into three categories.
- Instability at the extreme point. In the instability of steel structures, the extreme point instability is the second problem. It means that the shaping of the eccentric compression member of the steel structure cannot withstand its stability when it reaches a certain level. Extreme point instability also includes bidirectional bending members. The phenomenon of instability at the extreme point is relatively common. For example, some axial compression members are unstable due to problems such as initial bending or initial eccentricity.
- Jump over instability. For jump instability, there is no equilibrium bifurcation point and no extreme point, but there is also the problem of instability. This type of structure is mainly a sudden jump from one equilibrium configuration to another, which will lead to some large deformations.
- The equilibrium bifurcation is unstable. The problem of balance instability is mainly that the complete axis and the middle plane are affected by external force, which leads to instability. Equilibrium bifurcation instability, also known as branch point instability, is the primary problem in the stability of steel structures. Equilibrium instability also includes compressed cylindrical shells. In the stability problem, there are stable bifurcation instability and unstable bifurcation instability.
How to make a set of steel structure projects safe from beginning to end is very important. How to judge whether the steel structure construction team is safe or not, first of all, there must be a standardized construction team. Secondly, there must be construction requirements, and must have their own company standards for the project.
