The mechanics and deformation of high temperature steel frame rapidly cooled by spray water in fire fighting

- A steel frame at high temperature is introduced by integrating a new nonstationary mechanics and deformation based on the cooling location and cooling rate.
- The mechanics is mainly affected by the cooling location and cooling rate.
- The results are very useful for providing a new evaluation method for the structure's damage and failure in a practical fire fighting.

A finite element is established for analyzing the dynamical mechanics and deformation of steel frame at high temperature when it is rapidly cooled down by spray water in fire fighting. The simulation result shows that remarkable mechanical coupling effects are produced in the process, and the sectional stress in rapid cooling down is found considerably larger than that in heating-up. Meanwhile, the stress and deformation of a beam mainly related to cooling rate and location are much larger than those of a column in rapid cooling. In fire fighting, the structure on the first or second floor was more dangerous than those on other floors in rapid cooling. These results could provide a theoretical reference for the design of steel structure and fire fighting.