Temperature increase characteristics of steel structural elements with damage in fire protection

Temperatures in protected steel structural exposed to fire significantly increase due to cracks or gaps in fire protection damaged by earthquakes or thermal deformation. In this study, a series of experiments was conducted to clarify the influence of a partial flaw in fire protection, such as cracks and joint gaps that emulate structural or thermal damage, on the temperature increase of the steel elements. A temperature prediction model for the steel elements with a flaw in fire protection was developed. The thermal invasion through the damage in fire protection was considered in the model and the estimation validity was clarified.