One of the most known and used systems of passive fire protection is the protection of metal structures and concrete. Metallic structures, so versatile and resistant when designing bearing structures, exhibit at contact with heat source a rapid increase in temperature, and with this temperature increase occurs a decrease in mechanical strength.
Building and Industry regulations require structures to have a greater degree of bearing capacity in case of fire higher than the structures themselves in most cases. A suitable protection system must be added.
To prevent loss of stability of the structure, there are several ways of protection, such as mortars, intumescent paints and calcium silicate plates. However, when choosing the most appropriate protection, it is necessary to know what the factors are and how they influence the fire behavior of protected steel structures.